| 1 | // <ranges> -*- C++ -*- |
|---|---|
| 2 | |
| 3 | // Copyright (C) 2019-2024 Free Software Foundation, Inc. |
| 4 | // |
| 5 | // This file is part of the GNU ISO C++ Library. This library is free |
| 6 | // software; you can redistribute it and/or modify it under the |
| 7 | // terms of the GNU General Public License as published by the |
| 8 | // Free Software Foundation; either version 3, or (at your option) |
| 9 | // any later version. |
| 10 | |
| 11 | // This library is distributed in the hope that it will be useful, |
| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | // GNU General Public License for more details. |
| 15 | |
| 16 | // Under Section 7 of GPL version 3, you are granted additional |
| 17 | // permissions described in the GCC Runtime Library Exception, version |
| 18 | // 3.1, as published by the Free Software Foundation. |
| 19 | |
| 20 | // You should have received a copy of the GNU General Public License and |
| 21 | // a copy of the GCC Runtime Library Exception along with this program; |
| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 23 | // <http://www.gnu.org/licenses/>. |
| 24 | |
| 25 | /** @file include/ranges |
| 26 | * This is a Standard C++ Library header. |
| 27 | * @ingroup concepts |
| 28 | */ |
| 29 | |
| 30 | #ifndef _GLIBCXX_RANGES |
| 31 | #define _GLIBCXX_RANGES 1 |
| 32 | |
| 33 | #if __cplusplus > 201703L |
| 34 | |
| 35 | #pragma GCC system_header |
| 36 | |
| 37 | #include <concepts> |
| 38 | |
| 39 | #if __cpp_lib_concepts |
| 40 | |
| 41 | #include <compare> |
| 42 | #include <initializer_list> |
| 43 | #include <iterator> |
| 44 | #include <optional> |
| 45 | #include <span> |
| 46 | #include <string_view> |
| 47 | #include <tuple> |
| 48 | #if __cplusplus > 202002L |
| 49 | #include <variant> |
| 50 | #endif |
| 51 | #include <bits/ranges_util.h> |
| 52 | #include <bits/refwrap.h> |
| 53 | |
| 54 | #define __glibcxx_want_ranges |
| 55 | #define __glibcxx_want_ranges_as_const |
| 56 | #define __glibcxx_want_ranges_as_rvalue |
| 57 | #define __glibcxx_want_ranges_cartesian_product |
| 58 | #define __glibcxx_want_ranges_chunk |
| 59 | #define __glibcxx_want_ranges_chunk_by |
| 60 | #define __glibcxx_want_ranges_enumerate |
| 61 | #define __glibcxx_want_ranges_iota |
| 62 | #define __glibcxx_want_ranges_join_with |
| 63 | #define __glibcxx_want_ranges_repeat |
| 64 | #define __glibcxx_want_ranges_slide |
| 65 | #define __glibcxx_want_ranges_stride |
| 66 | #define __glibcxx_want_ranges_to_container |
| 67 | #define __glibcxx_want_ranges_zip |
| 68 | #include <bits/version.h> |
| 69 | |
| 70 | #ifdef __glibcxx_generator // C++ >= 23 && __glibcxx_coroutine |
| 71 | # include <bits/elements_of.h> |
| 72 | #endif |
| 73 | |
| 74 | /** |
| 75 | * @defgroup ranges Ranges |
| 76 | * |
| 77 | * Components for dealing with ranges of elements. |
| 78 | */ |
| 79 | |
| 80 | namespace std _GLIBCXX_VISIBILITY(default) |
| 81 | { |
| 82 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 83 | namespace ranges |
| 84 | { |
| 85 | // [range.access] customization point objects |
| 86 | // [range.req] range and view concepts |
| 87 | // [range.dangling] dangling iterator handling |
| 88 | // Defined in <bits/ranges_base.h> |
| 89 | |
| 90 | // [view.interface] View interface |
| 91 | // [range.subrange] Sub-ranges |
| 92 | // Defined in <bits/ranges_util.h> |
| 93 | |
| 94 | // C++20 24.6 [range.factories] Range factories |
| 95 | |
| 96 | /// A view that contains no elements. |
| 97 | template<typename _Tp> requires is_object_v<_Tp> |
| 98 | class empty_view |
| 99 | : public view_interface<empty_view<_Tp>> |
| 100 | { |
| 101 | public: |
| 102 | static constexpr _Tp* begin() noexcept { return nullptr; } |
| 103 | static constexpr _Tp* end() noexcept { return nullptr; } |
| 104 | static constexpr _Tp* data() noexcept { return nullptr; } |
| 105 | static constexpr size_t size() noexcept { return 0; } |
| 106 | static constexpr bool empty() noexcept { return true; } |
| 107 | }; |
| 108 | |
| 109 | template<typename _Tp> |
| 110 | inline constexpr bool enable_borrowed_range<empty_view<_Tp>> = true; |
| 111 | |
| 112 | namespace __detail |
| 113 | { |
| 114 | #if __cpp_lib_ranges >= 202207L // C++ >= 23 |
| 115 | // P2494R2 Relaxing range adaptors to allow for move only types |
| 116 | template<typename _Tp> |
| 117 | concept __boxable = move_constructible<_Tp> && is_object_v<_Tp>; |
| 118 | #else |
| 119 | template<typename _Tp> |
| 120 | concept __boxable = copy_constructible<_Tp> && is_object_v<_Tp>; |
| 121 | #endif |
| 122 | |
| 123 | template<__boxable _Tp> |
| 124 | struct __box : std::optional<_Tp> |
| 125 | { |
| 126 | using std::optional<_Tp>::optional; |
| 127 | |
| 128 | constexpr |
| 129 | __box() |
| 130 | noexcept(is_nothrow_default_constructible_v<_Tp>) |
| 131 | requires default_initializable<_Tp> |
| 132 | : std::optional<_Tp>{std::in_place} |
| 133 | { } |
| 134 | |
| 135 | __box(const __box&) = default; |
| 136 | __box(__box&&) = default; |
| 137 | |
| 138 | using std::optional<_Tp>::operator=; |
| 139 | |
| 140 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 141 | // 3477. Simplify constraints for semiregular-box |
| 142 | // 3572. copyable-box should be fully constexpr |
| 143 | constexpr __box& |
| 144 | operator=(const __box& __that) |
| 145 | noexcept(is_nothrow_copy_constructible_v<_Tp>) |
| 146 | requires (!copyable<_Tp>) && copy_constructible<_Tp> |
| 147 | { |
| 148 | if (this != std::__addressof(__that)) |
| 149 | { |
| 150 | if ((bool)__that) |
| 151 | this->emplace(*__that); |
| 152 | else |
| 153 | this->reset(); |
| 154 | } |
| 155 | return *this; |
| 156 | } |
| 157 | |
| 158 | constexpr __box& |
| 159 | operator=(__box&& __that) |
| 160 | noexcept(is_nothrow_move_constructible_v<_Tp>) |
| 161 | requires (!movable<_Tp>) |
| 162 | { |
| 163 | if (this != std::__addressof(__that)) |
| 164 | { |
| 165 | if ((bool)__that) |
| 166 | this->emplace(std::move(*__that)); |
| 167 | else |
| 168 | this->reset(); |
| 169 | } |
| 170 | return *this; |
| 171 | } |
| 172 | }; |
| 173 | |
| 174 | template<typename _Tp> |
| 175 | concept __boxable_copyable |
| 176 | = copy_constructible<_Tp> |
| 177 | && (copyable<_Tp> || (is_nothrow_move_constructible_v<_Tp> |
| 178 | && is_nothrow_copy_constructible_v<_Tp>)); |
| 179 | template<typename _Tp> |
| 180 | concept __boxable_movable |
| 181 | = (!copy_constructible<_Tp>) |
| 182 | && (movable<_Tp> || is_nothrow_move_constructible_v<_Tp>); |
| 183 | |
| 184 | // For types which are already copyable (or since C++23, movable) |
| 185 | // this specialization of the box wrapper stores the object directly |
| 186 | // without going through std::optional. It provides just the subset of |
| 187 | // the primary template's API that we currently use. |
| 188 | template<__boxable _Tp> |
| 189 | requires __boxable_copyable<_Tp> || __boxable_movable<_Tp> |
| 190 | struct __box<_Tp> |
| 191 | { |
| 192 | private: |
| 193 | [[no_unique_address]] _Tp _M_value = _Tp(); |
| 194 | |
| 195 | public: |
| 196 | __box() requires default_initializable<_Tp> = default; |
| 197 | |
| 198 | constexpr explicit |
| 199 | __box(const _Tp& __t) |
| 200 | noexcept(is_nothrow_copy_constructible_v<_Tp>) |
| 201 | requires copy_constructible<_Tp> |
| 202 | : _M_value(__t) |
| 203 | { } |
| 204 | |
| 205 | constexpr explicit |
| 206 | __box(_Tp&& __t) |
| 207 | noexcept(is_nothrow_move_constructible_v<_Tp>) |
| 208 | : _M_value(std::move(__t)) |
| 209 | { } |
| 210 | |
| 211 | template<typename... _Args> |
| 212 | requires constructible_from<_Tp, _Args...> |
| 213 | constexpr explicit |
| 214 | __box(in_place_t, _Args&&... __args) |
| 215 | noexcept(is_nothrow_constructible_v<_Tp, _Args...>) |
| 216 | : _M_value(std::forward<_Args>(__args)...) |
| 217 | { } |
| 218 | |
| 219 | __box(const __box&) = default; |
| 220 | __box(__box&&) = default; |
| 221 | __box& operator=(const __box&) requires copyable<_Tp> = default; |
| 222 | __box& operator=(__box&&) requires movable<_Tp> = default; |
| 223 | |
| 224 | // When _Tp is nothrow_copy_constructible but not copy_assignable, |
| 225 | // copy assignment is implemented via destroy-then-copy-construct. |
| 226 | constexpr __box& |
| 227 | operator=(const __box& __that) noexcept |
| 228 | requires (!copyable<_Tp>) && copy_constructible<_Tp> |
| 229 | { |
| 230 | static_assert(is_nothrow_copy_constructible_v<_Tp>); |
| 231 | if (this != std::__addressof(__that)) |
| 232 | { |
| 233 | _M_value.~_Tp(); |
| 234 | std::construct_at(std::__addressof(_M_value), *__that); |
| 235 | } |
| 236 | return *this; |
| 237 | } |
| 238 | |
| 239 | // Likewise for move assignment. |
| 240 | constexpr __box& |
| 241 | operator=(__box&& __that) noexcept |
| 242 | requires (!movable<_Tp>) |
| 243 | { |
| 244 | static_assert(is_nothrow_move_constructible_v<_Tp>); |
| 245 | if (this != std::__addressof(__that)) |
| 246 | { |
| 247 | _M_value.~_Tp(); |
| 248 | std::construct_at(std::__addressof(_M_value), std::move(*__that)); |
| 249 | } |
| 250 | return *this; |
| 251 | } |
| 252 | |
| 253 | constexpr bool |
| 254 | has_value() const noexcept |
| 255 | { return true; }; |
| 256 | |
| 257 | constexpr _Tp& |
| 258 | operator*() & noexcept |
| 259 | { return _M_value; } |
| 260 | |
| 261 | constexpr const _Tp& |
| 262 | operator*() const & noexcept |
| 263 | { return _M_value; } |
| 264 | |
| 265 | constexpr _Tp&& |
| 266 | operator*() && noexcept |
| 267 | { return std::move(_M_value); } |
| 268 | |
| 269 | constexpr const _Tp&& |
| 270 | operator*() const && noexcept |
| 271 | { return std::move(_M_value); } |
| 272 | |
| 273 | constexpr _Tp* |
| 274 | operator->() noexcept |
| 275 | { return std::__addressof(_M_value); } |
| 276 | |
| 277 | constexpr const _Tp* |
| 278 | operator->() const noexcept |
| 279 | { return std::__addressof(_M_value); } |
| 280 | }; |
| 281 | } // namespace __detail |
| 282 | |
| 283 | /// A view that contains exactly one element. |
| 284 | #if __cpp_lib_ranges >= 202207L // C++ >= 23 |
| 285 | template<move_constructible _Tp> |
| 286 | #else |
| 287 | template<copy_constructible _Tp> |
| 288 | #endif |
| 289 | requires is_object_v<_Tp> |
| 290 | class single_view : public view_interface<single_view<_Tp>> |
| 291 | { |
| 292 | public: |
| 293 | single_view() requires default_initializable<_Tp> = default; |
| 294 | |
| 295 | constexpr explicit |
| 296 | single_view(const _Tp& __t) |
| 297 | noexcept(is_nothrow_copy_constructible_v<_Tp>) |
| 298 | requires copy_constructible<_Tp> |
| 299 | : _M_value(__t) |
| 300 | { } |
| 301 | |
| 302 | constexpr explicit |
| 303 | single_view(_Tp&& __t) |
| 304 | noexcept(is_nothrow_move_constructible_v<_Tp>) |
| 305 | : _M_value(std::move(__t)) |
| 306 | { } |
| 307 | |
| 308 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 309 | // 3428. single_view's in place constructor should be explicit |
| 310 | template<typename... _Args> |
| 311 | requires constructible_from<_Tp, _Args...> |
| 312 | constexpr explicit |
| 313 | single_view(in_place_t, _Args&&... __args) |
| 314 | noexcept(is_nothrow_constructible_v<_Tp, _Args...>) |
| 315 | : _M_value{in_place, std::forward<_Args>(__args)...} |
| 316 | { } |
| 317 | |
| 318 | constexpr _Tp* |
| 319 | begin() noexcept |
| 320 | { return data(); } |
| 321 | |
| 322 | constexpr const _Tp* |
| 323 | begin() const noexcept |
| 324 | { return data(); } |
| 325 | |
| 326 | constexpr _Tp* |
| 327 | end() noexcept |
| 328 | { return data() + 1; } |
| 329 | |
| 330 | constexpr const _Tp* |
| 331 | end() const noexcept |
| 332 | { return data() + 1; } |
| 333 | |
| 334 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 335 | // 4035. single_view should provide empty |
| 336 | static constexpr bool |
| 337 | empty() noexcept |
| 338 | { return false; } |
| 339 | |
| 340 | static constexpr size_t |
| 341 | size() noexcept |
| 342 | { return 1; } |
| 343 | |
| 344 | constexpr _Tp* |
| 345 | data() noexcept |
| 346 | { return _M_value.operator->(); } |
| 347 | |
| 348 | constexpr const _Tp* |
| 349 | data() const noexcept |
| 350 | { return _M_value.operator->(); } |
| 351 | |
| 352 | private: |
| 353 | [[no_unique_address]] __detail::__box<_Tp> _M_value; |
| 354 | }; |
| 355 | |
| 356 | template<typename _Tp> |
| 357 | single_view(_Tp) -> single_view<_Tp>; |
| 358 | |
| 359 | namespace __detail |
| 360 | { |
| 361 | template<typename _Wp> |
| 362 | constexpr auto __to_signed_like(_Wp __w) noexcept |
| 363 | { |
| 364 | if constexpr (!integral<_Wp>) |
| 365 | return iter_difference_t<_Wp>(); |
| 366 | else if constexpr (sizeof(iter_difference_t<_Wp>) > sizeof(_Wp)) |
| 367 | return iter_difference_t<_Wp>(__w); |
| 368 | else if constexpr (sizeof(ptrdiff_t) > sizeof(_Wp)) |
| 369 | return ptrdiff_t(__w); |
| 370 | else if constexpr (sizeof(long long) > sizeof(_Wp)) |
| 371 | return (long long)(__w); |
| 372 | #ifdef __SIZEOF_INT128__ |
| 373 | else if constexpr (__SIZEOF_INT128__ > sizeof(_Wp)) |
| 374 | return __int128(__w); |
| 375 | #endif |
| 376 | else |
| 377 | return __max_diff_type(__w); |
| 378 | } |
| 379 | |
| 380 | template<typename _Wp> |
| 381 | using __iota_diff_t = decltype(__to_signed_like(std::declval<_Wp>())); |
| 382 | |
| 383 | template<typename _It> |
| 384 | concept __decrementable = incrementable<_It> |
| 385 | && requires(_It __i) |
| 386 | { |
| 387 | { --__i } -> same_as<_It&>; |
| 388 | { __i-- } -> same_as<_It>; |
| 389 | }; |
| 390 | |
| 391 | template<typename _It> |
| 392 | concept __advanceable = __decrementable<_It> && totally_ordered<_It> |
| 393 | && requires( _It __i, const _It __j, const __iota_diff_t<_It> __n) |
| 394 | { |
| 395 | { __i += __n } -> same_as<_It&>; |
| 396 | { __i -= __n } -> same_as<_It&>; |
| 397 | _It(__j + __n); |
| 398 | _It(__n + __j); |
| 399 | _It(__j - __n); |
| 400 | { __j - __j } -> convertible_to<__iota_diff_t<_It>>; |
| 401 | }; |
| 402 | |
| 403 | template<typename _Winc> |
| 404 | struct __iota_view_iter_cat |
| 405 | { }; |
| 406 | |
| 407 | template<incrementable _Winc> |
| 408 | struct __iota_view_iter_cat<_Winc> |
| 409 | { using iterator_category = input_iterator_tag; }; |
| 410 | } // namespace __detail |
| 411 | |
| 412 | template<weakly_incrementable _Winc, |
| 413 | semiregular _Bound = unreachable_sentinel_t> |
| 414 | requires std::__detail::__weakly_eq_cmp_with<_Winc, _Bound> |
| 415 | && copyable<_Winc> |
| 416 | class iota_view : public view_interface<iota_view<_Winc, _Bound>> |
| 417 | { |
| 418 | private: |
| 419 | struct _Sentinel; |
| 420 | |
| 421 | struct _Iterator : __detail::__iota_view_iter_cat<_Winc> |
| 422 | { |
| 423 | private: |
| 424 | static auto |
| 425 | _S_iter_concept() |
| 426 | { |
| 427 | using namespace __detail; |
| 428 | if constexpr (__advanceable<_Winc>) |
| 429 | return random_access_iterator_tag{}; |
| 430 | else if constexpr (__decrementable<_Winc>) |
| 431 | return bidirectional_iterator_tag{}; |
| 432 | else if constexpr (incrementable<_Winc>) |
| 433 | return forward_iterator_tag{}; |
| 434 | else |
| 435 | return input_iterator_tag{}; |
| 436 | } |
| 437 | |
| 438 | public: |
| 439 | using iterator_concept = decltype(_S_iter_concept()); |
| 440 | // iterator_category defined in __iota_view_iter_cat |
| 441 | using value_type = _Winc; |
| 442 | using difference_type = __detail::__iota_diff_t<_Winc>; |
| 443 | |
| 444 | _Iterator() requires default_initializable<_Winc> = default; |
| 445 | |
| 446 | constexpr explicit |
| 447 | _Iterator(_Winc __value) |
| 448 | : _M_value(__value) { } |
| 449 | |
| 450 | constexpr _Winc |
| 451 | operator*() const noexcept(is_nothrow_copy_constructible_v<_Winc>) |
| 452 | { return _M_value; } |
| 453 | |
| 454 | constexpr _Iterator& |
| 455 | operator++() |
| 456 | { |
| 457 | ++_M_value; |
| 458 | return *this; |
| 459 | } |
| 460 | |
| 461 | constexpr void |
| 462 | operator++(int) |
| 463 | { ++*this; } |
| 464 | |
| 465 | constexpr _Iterator |
| 466 | operator++(int) requires incrementable<_Winc> |
| 467 | { |
| 468 | auto __tmp = *this; |
| 469 | ++*this; |
| 470 | return __tmp; |
| 471 | } |
| 472 | |
| 473 | constexpr _Iterator& |
| 474 | operator--() requires __detail::__decrementable<_Winc> |
| 475 | { |
| 476 | --_M_value; |
| 477 | return *this; |
| 478 | } |
| 479 | |
| 480 | constexpr _Iterator |
| 481 | operator--(int) requires __detail::__decrementable<_Winc> |
| 482 | { |
| 483 | auto __tmp = *this; |
| 484 | --*this; |
| 485 | return __tmp; |
| 486 | } |
| 487 | |
| 488 | constexpr _Iterator& |
| 489 | operator+=(difference_type __n) requires __detail::__advanceable<_Winc> |
| 490 | { |
| 491 | using __detail::__is_integer_like; |
| 492 | using __detail::__is_signed_integer_like; |
| 493 | if constexpr (__is_integer_like<_Winc> |
| 494 | && !__is_signed_integer_like<_Winc>) |
| 495 | { |
| 496 | if (__n >= difference_type(0)) |
| 497 | _M_value += static_cast<_Winc>(__n); |
| 498 | else |
| 499 | _M_value -= static_cast<_Winc>(-__n); |
| 500 | } |
| 501 | else |
| 502 | _M_value += __n; |
| 503 | return *this; |
| 504 | } |
| 505 | |
| 506 | constexpr _Iterator& |
| 507 | operator-=(difference_type __n) requires __detail::__advanceable<_Winc> |
| 508 | { |
| 509 | using __detail::__is_integer_like; |
| 510 | using __detail::__is_signed_integer_like; |
| 511 | if constexpr (__is_integer_like<_Winc> |
| 512 | && !__is_signed_integer_like<_Winc>) |
| 513 | { |
| 514 | if (__n >= difference_type(0)) |
| 515 | _M_value -= static_cast<_Winc>(__n); |
| 516 | else |
| 517 | _M_value += static_cast<_Winc>(-__n); |
| 518 | } |
| 519 | else |
| 520 | _M_value -= __n; |
| 521 | return *this; |
| 522 | } |
| 523 | |
| 524 | constexpr _Winc |
| 525 | operator[](difference_type __n) const |
| 526 | requires __detail::__advanceable<_Winc> |
| 527 | { return _Winc(_M_value + __n); } |
| 528 | |
| 529 | friend constexpr bool |
| 530 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 531 | requires equality_comparable<_Winc> |
| 532 | { return __x._M_value == __y._M_value; } |
| 533 | |
| 534 | friend constexpr bool |
| 535 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 536 | requires totally_ordered<_Winc> |
| 537 | { return __x._M_value < __y._M_value; } |
| 538 | |
| 539 | friend constexpr bool |
| 540 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 541 | requires totally_ordered<_Winc> |
| 542 | { return __y < __x; } |
| 543 | |
| 544 | friend constexpr bool |
| 545 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 546 | requires totally_ordered<_Winc> |
| 547 | { return !(__y < __x); } |
| 548 | |
| 549 | friend constexpr bool |
| 550 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 551 | requires totally_ordered<_Winc> |
| 552 | { return !(__x < __y); } |
| 553 | |
| 554 | #ifdef __cpp_lib_three_way_comparison |
| 555 | friend constexpr auto |
| 556 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 557 | requires totally_ordered<_Winc> && three_way_comparable<_Winc> |
| 558 | { return __x._M_value <=> __y._M_value; } |
| 559 | #endif |
| 560 | |
| 561 | friend constexpr _Iterator |
| 562 | operator+(_Iterator __i, difference_type __n) |
| 563 | requires __detail::__advanceable<_Winc> |
| 564 | { |
| 565 | __i += __n; |
| 566 | return __i; |
| 567 | } |
| 568 | |
| 569 | friend constexpr _Iterator |
| 570 | operator+(difference_type __n, _Iterator __i) |
| 571 | requires __detail::__advanceable<_Winc> |
| 572 | { return __i += __n; } |
| 573 | |
| 574 | friend constexpr _Iterator |
| 575 | operator-(_Iterator __i, difference_type __n) |
| 576 | requires __detail::__advanceable<_Winc> |
| 577 | { |
| 578 | __i -= __n; |
| 579 | return __i; |
| 580 | } |
| 581 | |
| 582 | friend constexpr difference_type |
| 583 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 584 | requires __detail::__advanceable<_Winc> |
| 585 | { |
| 586 | using __detail::__is_integer_like; |
| 587 | using __detail::__is_signed_integer_like; |
| 588 | using _Dt = difference_type; |
| 589 | if constexpr (__is_integer_like<_Winc>) |
| 590 | { |
| 591 | if constexpr (__is_signed_integer_like<_Winc>) |
| 592 | return _Dt(_Dt(__x._M_value) - _Dt(__y._M_value)); |
| 593 | else |
| 594 | return (__y._M_value > __x._M_value) |
| 595 | ? _Dt(-_Dt(__y._M_value - __x._M_value)) |
| 596 | : _Dt(__x._M_value - __y._M_value); |
| 597 | } |
| 598 | else |
| 599 | return __x._M_value - __y._M_value; |
| 600 | } |
| 601 | |
| 602 | private: |
| 603 | _Winc _M_value = _Winc(); |
| 604 | |
| 605 | friend iota_view; |
| 606 | friend _Sentinel; |
| 607 | }; |
| 608 | |
| 609 | struct _Sentinel |
| 610 | { |
| 611 | private: |
| 612 | constexpr bool |
| 613 | _M_equal(const _Iterator& __x) const |
| 614 | { return __x._M_value == _M_bound; } |
| 615 | |
| 616 | constexpr auto |
| 617 | _M_distance_from(const _Iterator& __x) const |
| 618 | { return _M_bound - __x._M_value; } |
| 619 | |
| 620 | _Bound _M_bound = _Bound(); |
| 621 | |
| 622 | public: |
| 623 | _Sentinel() = default; |
| 624 | |
| 625 | constexpr explicit |
| 626 | _Sentinel(_Bound __bound) |
| 627 | : _M_bound(__bound) { } |
| 628 | |
| 629 | friend constexpr bool |
| 630 | operator==(const _Iterator& __x, const _Sentinel& __y) |
| 631 | { return __y._M_equal(__x); } |
| 632 | |
| 633 | friend constexpr iter_difference_t<_Winc> |
| 634 | operator-(const _Iterator& __x, const _Sentinel& __y) |
| 635 | requires sized_sentinel_for<_Bound, _Winc> |
| 636 | { return -__y._M_distance_from(__x); } |
| 637 | |
| 638 | friend constexpr iter_difference_t<_Winc> |
| 639 | operator-(const _Sentinel& __x, const _Iterator& __y) |
| 640 | requires sized_sentinel_for<_Bound, _Winc> |
| 641 | { return __x._M_distance_from(__y); } |
| 642 | |
| 643 | friend iota_view; |
| 644 | }; |
| 645 | |
| 646 | _Winc _M_value = _Winc(); |
| 647 | [[no_unique_address]] _Bound _M_bound = _Bound(); |
| 648 | |
| 649 | public: |
| 650 | iota_view() requires default_initializable<_Winc> = default; |
| 651 | |
| 652 | constexpr explicit |
| 653 | iota_view(_Winc __value) |
| 654 | : _M_value(__value) |
| 655 | { } |
| 656 | |
| 657 | constexpr |
| 658 | iota_view(type_identity_t<_Winc> __value, |
| 659 | type_identity_t<_Bound> __bound) |
| 660 | : _M_value(__value), _M_bound(__bound) |
| 661 | { |
| 662 | if constexpr (totally_ordered_with<_Winc, _Bound>) |
| 663 | __glibcxx_assert( bool(__value <= __bound) ); |
| 664 | } |
| 665 | |
| 666 | constexpr |
| 667 | iota_view(_Iterator __first, _Iterator __last) |
| 668 | requires same_as<_Winc, _Bound> |
| 669 | : iota_view(__first._M_value, __last._M_value) |
| 670 | { } |
| 671 | |
| 672 | constexpr |
| 673 | iota_view(_Iterator __first, unreachable_sentinel_t __last) |
| 674 | requires same_as<_Bound, unreachable_sentinel_t> |
| 675 | : iota_view(__first._M_value, __last) |
| 676 | { } |
| 677 | |
| 678 | constexpr |
| 679 | iota_view(_Iterator __first, _Sentinel __last) |
| 680 | requires (!same_as<_Winc, _Bound>) && (!same_as<_Bound, unreachable_sentinel_t>) |
| 681 | : iota_view(__first._M_value, __last._M_bound) |
| 682 | { } |
| 683 | |
| 684 | constexpr _Iterator |
| 685 | begin() const { return _Iterator{_M_value}; } |
| 686 | |
| 687 | constexpr auto |
| 688 | end() const |
| 689 | { |
| 690 | if constexpr (same_as<_Bound, unreachable_sentinel_t>) |
| 691 | return unreachable_sentinel; |
| 692 | else |
| 693 | return _Sentinel{_M_bound}; |
| 694 | } |
| 695 | |
| 696 | constexpr _Iterator |
| 697 | end() const requires same_as<_Winc, _Bound> |
| 698 | { return _Iterator{_M_bound}; } |
| 699 | |
| 700 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 701 | // 4001. iota_view should provide empty |
| 702 | constexpr bool |
| 703 | empty() const |
| 704 | { return _M_value == _M_bound; } |
| 705 | |
| 706 | constexpr auto |
| 707 | size() const |
| 708 | requires (same_as<_Winc, _Bound> && __detail::__advanceable<_Winc>) |
| 709 | || (integral<_Winc> && integral<_Bound>) |
| 710 | || sized_sentinel_for<_Bound, _Winc> |
| 711 | { |
| 712 | using __detail::__is_integer_like; |
| 713 | using __detail::__to_unsigned_like; |
| 714 | if constexpr (integral<_Winc> && integral<_Bound>) |
| 715 | { |
| 716 | using _Up = make_unsigned_t<decltype(_M_bound - _M_value)>; |
| 717 | return _Up(_M_bound) - _Up(_M_value); |
| 718 | } |
| 719 | else if constexpr (__is_integer_like<_Winc>) |
| 720 | return __to_unsigned_like(_M_bound) - __to_unsigned_like(_M_value); |
| 721 | else |
| 722 | return __to_unsigned_like(_M_bound - _M_value); |
| 723 | } |
| 724 | }; |
| 725 | |
| 726 | template<typename _Winc, typename _Bound> |
| 727 | requires (!__detail::__is_integer_like<_Winc> |
| 728 | || !__detail::__is_integer_like<_Bound> |
| 729 | || (__detail::__is_signed_integer_like<_Winc> |
| 730 | == __detail::__is_signed_integer_like<_Bound>)) |
| 731 | iota_view(_Winc, _Bound) -> iota_view<_Winc, _Bound>; |
| 732 | |
| 733 | template<typename _Winc, typename _Bound> |
| 734 | inline constexpr bool |
| 735 | enable_borrowed_range<iota_view<_Winc, _Bound>> = true; |
| 736 | |
| 737 | namespace views |
| 738 | { |
| 739 | template<typename _Tp> |
| 740 | inline constexpr empty_view<_Tp> empty{}; |
| 741 | |
| 742 | namespace __detail |
| 743 | { |
| 744 | template<typename _Tp> |
| 745 | concept __can_single_view |
| 746 | = requires { single_view<decay_t<_Tp>>(std::declval<_Tp>()); }; |
| 747 | } // namespace __detail |
| 748 | |
| 749 | struct _Single |
| 750 | { |
| 751 | template<__detail::__can_single_view _Tp> |
| 752 | constexpr auto |
| 753 | operator() [[nodiscard]] (_Tp&& __e) const |
| 754 | noexcept(noexcept(single_view<decay_t<_Tp>>(std::forward<_Tp>(__e)))) |
| 755 | { return single_view<decay_t<_Tp>>(std::forward<_Tp>(__e)); } |
| 756 | }; |
| 757 | |
| 758 | inline constexpr _Single single{}; |
| 759 | |
| 760 | namespace __detail |
| 761 | { |
| 762 | template<typename... _Args> |
| 763 | concept __can_iota_view = requires { iota_view(std::declval<_Args>()...); }; |
| 764 | } // namespace __detail |
| 765 | |
| 766 | struct _Iota |
| 767 | { |
| 768 | template<__detail::__can_iota_view _Tp> |
| 769 | constexpr auto |
| 770 | operator() [[nodiscard]] (_Tp&& __e) const |
| 771 | { return iota_view(std::forward<_Tp>(__e)); } |
| 772 | |
| 773 | template<typename _Tp, typename _Up> |
| 774 | requires __detail::__can_iota_view<_Tp, _Up> |
| 775 | constexpr auto |
| 776 | operator() [[nodiscard]] (_Tp&& __e, _Up&& __f) const |
| 777 | { return iota_view(std::forward<_Tp>(__e), std::forward<_Up>(__f)); } |
| 778 | }; |
| 779 | |
| 780 | inline constexpr _Iota iota{}; |
| 781 | } // namespace views |
| 782 | |
| 783 | #if _GLIBCXX_HOSTED |
| 784 | namespace __detail |
| 785 | { |
| 786 | template<typename _Val, typename _CharT, typename _Traits> |
| 787 | concept __stream_extractable |
| 788 | = requires(basic_istream<_CharT, _Traits>& is, _Val& t) { is >> t; }; |
| 789 | } // namespace __detail |
| 790 | |
| 791 | template<movable _Val, typename _CharT, |
| 792 | typename _Traits = char_traits<_CharT>> |
| 793 | requires default_initializable<_Val> |
| 794 | && __detail::__stream_extractable<_Val, _CharT, _Traits> |
| 795 | class basic_istream_view |
| 796 | : public view_interface<basic_istream_view<_Val, _CharT, _Traits>> |
| 797 | { |
| 798 | public: |
| 799 | constexpr explicit |
| 800 | basic_istream_view(basic_istream<_CharT, _Traits>& __stream) |
| 801 | : _M_stream(std::__addressof(__stream)) |
| 802 | { } |
| 803 | |
| 804 | constexpr auto |
| 805 | begin() |
| 806 | { |
| 807 | *_M_stream >> _M_object; |
| 808 | return _Iterator{this}; |
| 809 | } |
| 810 | |
| 811 | constexpr default_sentinel_t |
| 812 | end() const noexcept |
| 813 | { return default_sentinel; } |
| 814 | |
| 815 | private: |
| 816 | basic_istream<_CharT, _Traits>* _M_stream; |
| 817 | _Val _M_object = _Val(); |
| 818 | |
| 819 | struct _Iterator |
| 820 | { |
| 821 | public: |
| 822 | using iterator_concept = input_iterator_tag; |
| 823 | using difference_type = ptrdiff_t; |
| 824 | using value_type = _Val; |
| 825 | |
| 826 | constexpr explicit |
| 827 | _Iterator(basic_istream_view* __parent) noexcept |
| 828 | : _M_parent(__parent) |
| 829 | { } |
| 830 | |
| 831 | _Iterator(const _Iterator&) = delete; |
| 832 | _Iterator(_Iterator&&) = default; |
| 833 | _Iterator& operator=(const _Iterator&) = delete; |
| 834 | _Iterator& operator=(_Iterator&&) = default; |
| 835 | |
| 836 | _Iterator& |
| 837 | operator++() |
| 838 | { |
| 839 | *_M_parent->_M_stream >> _M_parent->_M_object; |
| 840 | return *this; |
| 841 | } |
| 842 | |
| 843 | void |
| 844 | operator++(int) |
| 845 | { ++*this; } |
| 846 | |
| 847 | _Val& |
| 848 | operator*() const |
| 849 | { return _M_parent->_M_object; } |
| 850 | |
| 851 | friend bool |
| 852 | operator==(const _Iterator& __x, default_sentinel_t) |
| 853 | { return __x._M_at_end(); } |
| 854 | |
| 855 | private: |
| 856 | basic_istream_view* _M_parent; |
| 857 | |
| 858 | bool |
| 859 | _M_at_end() const |
| 860 | { return !*_M_parent->_M_stream; } |
| 861 | }; |
| 862 | |
| 863 | friend _Iterator; |
| 864 | }; |
| 865 | |
| 866 | template<typename _Val> |
| 867 | using istream_view = basic_istream_view<_Val, char>; |
| 868 | |
| 869 | template<typename _Val> |
| 870 | using wistream_view = basic_istream_view<_Val, wchar_t>; |
| 871 | |
| 872 | namespace views |
| 873 | { |
| 874 | namespace __detail |
| 875 | { |
| 876 | template<typename _Tp, typename _Up> |
| 877 | concept __can_istream_view = requires (_Up __e) { |
| 878 | basic_istream_view<_Tp, typename _Up::char_type, typename _Up::traits_type>(__e); |
| 879 | }; |
| 880 | } // namespace __detail |
| 881 | |
| 882 | template<typename _Tp> |
| 883 | struct _Istream |
| 884 | { |
| 885 | template<typename _CharT, typename _Traits> |
| 886 | constexpr auto |
| 887 | operator() [[nodiscard]] (basic_istream<_CharT, _Traits>& __e) const |
| 888 | requires __detail::__can_istream_view<_Tp, remove_reference_t<decltype(__e)>> |
| 889 | { return basic_istream_view<_Tp, _CharT, _Traits>(__e); } |
| 890 | }; |
| 891 | |
| 892 | template<typename _Tp> |
| 893 | inline constexpr _Istream<_Tp> istream; |
| 894 | } |
| 895 | #endif // HOSTED |
| 896 | |
| 897 | // C++20 24.7 [range.adaptors] Range adaptors |
| 898 | |
| 899 | namespace __detail |
| 900 | { |
| 901 | template<typename _Tp, int _Disc> |
| 902 | struct _Absent { }; |
| 903 | |
| 904 | // Alias for a type that is conditionally present |
| 905 | // (and is an empty type otherwise). |
| 906 | // Data members using this alias should use [[no_unique_address]] so that |
| 907 | // they take no space when not needed. |
| 908 | // The optional template parameter _Disc is for discriminating two otherwise |
| 909 | // equivalent absent types so that even they can overlap. |
| 910 | template<bool _Present, typename _Tp, int _Disc = 0> |
| 911 | using __maybe_present_t = __conditional_t<_Present, _Tp, _Absent<_Tp, _Disc>>; |
| 912 | |
| 913 | // Alias for a type that is conditionally const. |
| 914 | template<bool _Const, typename _Tp> |
| 915 | using __maybe_const_t = __conditional_t<_Const, const _Tp, _Tp>; |
| 916 | |
| 917 | } // namespace __detail |
| 918 | |
| 919 | // Shorthand for __detail::__maybe_const_t. |
| 920 | using __detail::__maybe_const_t; |
| 921 | |
| 922 | namespace views::__adaptor |
| 923 | { |
| 924 | // True if the range adaptor _Adaptor can be applied with _Args. |
| 925 | template<typename _Adaptor, typename... _Args> |
| 926 | concept __adaptor_invocable |
| 927 | = requires { std::declval<_Adaptor>()(declval<_Args>()...); }; |
| 928 | |
| 929 | // True if the range adaptor non-closure _Adaptor can be partially applied |
| 930 | // with _Args. |
| 931 | template<typename _Adaptor, typename... _Args> |
| 932 | concept __adaptor_partial_app_viable = (_Adaptor::_S_arity > 1) |
| 933 | && (sizeof...(_Args) == _Adaptor::_S_arity - 1) |
| 934 | && (constructible_from<decay_t<_Args>, _Args> && ...); |
| 935 | |
| 936 | template<typename _Adaptor, typename... _Args> |
| 937 | struct _Partial; |
| 938 | |
| 939 | template<typename _Lhs, typename _Rhs> |
| 940 | struct _Pipe; |
| 941 | |
| 942 | // The base class of every range adaptor closure. |
| 943 | // |
| 944 | // The derived class should define the optional static data member |
| 945 | // _S_has_simple_call_op to true if the behavior of this adaptor is |
| 946 | // independent of the constness/value category of the adaptor object. |
| 947 | template<typename _Derived> |
| 948 | struct _RangeAdaptorClosure |
| 949 | { }; |
| 950 | |
| 951 | template<typename _Tp, typename _Up> |
| 952 | requires (!same_as<_Tp, _RangeAdaptorClosure<_Up>>) |
| 953 | void __is_range_adaptor_closure_fn |
| 954 | (const _Tp&, const _RangeAdaptorClosure<_Up>&); // not defined |
| 955 | |
| 956 | template<typename _Tp> |
| 957 | concept __is_range_adaptor_closure |
| 958 | = requires (_Tp __t) { __adaptor::__is_range_adaptor_closure_fn(__t, __t); }; |
| 959 | |
| 960 | #pragma GCC diagnostic push |
| 961 | #pragma GCC diagnostic ignored "-Wdangling-reference" |
| 962 | // range | adaptor is equivalent to adaptor(range). |
| 963 | template<typename _Self, typename _Range> |
| 964 | requires __is_range_adaptor_closure<_Self> |
| 965 | && __adaptor_invocable<_Self, _Range> |
| 966 | constexpr auto |
| 967 | operator|(_Range&& __r, _Self&& __self) |
| 968 | { return std::forward<_Self>(__self)(std::forward<_Range>(__r)); } |
| 969 | |
| 970 | // Compose the adaptors __lhs and __rhs into a pipeline, returning |
| 971 | // another range adaptor closure object. |
| 972 | template<typename _Lhs, typename _Rhs> |
| 973 | requires __is_range_adaptor_closure<_Lhs> |
| 974 | && __is_range_adaptor_closure<_Rhs> |
| 975 | constexpr auto |
| 976 | operator|(_Lhs&& __lhs, _Rhs&& __rhs) |
| 977 | { |
| 978 | return _Pipe<decay_t<_Lhs>, decay_t<_Rhs>>{std::forward<_Lhs>(__lhs), |
| 979 | std::forward<_Rhs>(__rhs)}; |
| 980 | } |
| 981 | #pragma GCC diagnostic pop |
| 982 | |
| 983 | // The base class of every range adaptor non-closure. |
| 984 | // |
| 985 | // The static data member _Derived::_S_arity must contain the total number of |
| 986 | // arguments that the adaptor takes, and the class _Derived must introduce |
| 987 | // _RangeAdaptor::operator() into the class scope via a using-declaration. |
| 988 | // |
| 989 | // The optional static data member _Derived::_S_has_simple_extra_args should |
| 990 | // be defined to true if the behavior of this adaptor is independent of the |
| 991 | // constness/value category of the extra arguments. This data member could |
| 992 | // also be defined as a variable template parameterized by the types of the |
| 993 | // extra arguments. |
| 994 | template<typename _Derived> |
| 995 | struct _RangeAdaptor |
| 996 | { |
| 997 | // Partially apply the arguments __args to the range adaptor _Derived, |
| 998 | // returning a range adaptor closure object. |
| 999 | template<typename... _Args> |
| 1000 | requires __adaptor_partial_app_viable<_Derived, _Args...> |
| 1001 | constexpr auto |
| 1002 | operator()(_Args&&... __args) const |
| 1003 | { |
| 1004 | return _Partial<_Derived, decay_t<_Args>...>{0, std::forward<_Args>(__args)...}; |
| 1005 | } |
| 1006 | }; |
| 1007 | |
| 1008 | // True if the range adaptor closure _Adaptor has a simple operator(), i.e. |
| 1009 | // one that's not overloaded according to constness or value category of the |
| 1010 | // _Adaptor object. |
| 1011 | template<typename _Adaptor> |
| 1012 | concept __closure_has_simple_call_op = _Adaptor::_S_has_simple_call_op; |
| 1013 | |
| 1014 | // True if the behavior of the range adaptor non-closure _Adaptor is |
| 1015 | // independent of the value category of its extra arguments _Args. |
| 1016 | template<typename _Adaptor, typename... _Args> |
| 1017 | concept __adaptor_has_simple_extra_args = _Adaptor::_S_has_simple_extra_args |
| 1018 | || _Adaptor::template _S_has_simple_extra_args<_Args...>; |
| 1019 | |
| 1020 | // A range adaptor closure that represents partial application of |
| 1021 | // the range adaptor _Adaptor with arguments _Args. |
| 1022 | template<typename _Adaptor, typename... _Args> |
| 1023 | struct _Partial : _RangeAdaptorClosure<_Partial<_Adaptor, _Args...>> |
| 1024 | { |
| 1025 | tuple<_Args...> _M_args; |
| 1026 | |
| 1027 | // First parameter is to ensure this constructor is never used |
| 1028 | // instead of the copy/move constructor. |
| 1029 | template<typename... _Ts> |
| 1030 | constexpr |
| 1031 | _Partial(int, _Ts&&... __args) |
| 1032 | : _M_args(std::forward<_Ts>(__args)...) |
| 1033 | { } |
| 1034 | |
| 1035 | // Invoke _Adaptor with arguments __r, _M_args... according to the |
| 1036 | // value category of this _Partial object. |
| 1037 | #if __cpp_explicit_this_parameter |
| 1038 | template<typename _Self, typename _Range> |
| 1039 | requires __adaptor_invocable<_Adaptor, _Range, __like_t<_Self, _Args>...> |
| 1040 | constexpr auto |
| 1041 | operator()(this _Self&& __self, _Range&& __r) |
| 1042 | { |
| 1043 | auto __forwarder = [&__r] (auto&&... __args) { |
| 1044 | return _Adaptor{}(std::forward<_Range>(__r), |
| 1045 | std::forward<decltype(__args)>(__args)...); |
| 1046 | }; |
| 1047 | return std::apply(__forwarder, __like_t<_Self, _Partial>(__self)._M_args); |
| 1048 | } |
| 1049 | #else |
| 1050 | template<typename _Range> |
| 1051 | requires __adaptor_invocable<_Adaptor, _Range, const _Args&...> |
| 1052 | constexpr auto |
| 1053 | operator()(_Range&& __r) const & |
| 1054 | { |
| 1055 | auto __forwarder = [&__r] (const auto&... __args) { |
| 1056 | return _Adaptor{}(std::forward<_Range>(__r), __args...); |
| 1057 | }; |
| 1058 | return std::apply(__forwarder, _M_args); |
| 1059 | } |
| 1060 | |
| 1061 | template<typename _Range> |
| 1062 | requires __adaptor_invocable<_Adaptor, _Range, _Args...> |
| 1063 | constexpr auto |
| 1064 | operator()(_Range&& __r) && |
| 1065 | { |
| 1066 | auto __forwarder = [&__r] (auto&... __args) { |
| 1067 | return _Adaptor{}(std::forward<_Range>(__r), std::move(__args)...); |
| 1068 | }; |
| 1069 | return std::apply(__forwarder, _M_args); |
| 1070 | } |
| 1071 | |
| 1072 | template<typename _Range> |
| 1073 | constexpr auto |
| 1074 | operator()(_Range&& __r) const && = delete; |
| 1075 | #endif |
| 1076 | }; |
| 1077 | |
| 1078 | // A lightweight specialization of the above primary template for |
| 1079 | // the common case where _Adaptor accepts a single extra argument. |
| 1080 | template<typename _Adaptor, typename _Arg> |
| 1081 | struct _Partial<_Adaptor, _Arg> : _RangeAdaptorClosure<_Partial<_Adaptor, _Arg>> |
| 1082 | { |
| 1083 | _Arg _M_arg; |
| 1084 | |
| 1085 | template<typename _Tp> |
| 1086 | constexpr |
| 1087 | _Partial(int, _Tp&& __arg) |
| 1088 | : _M_arg(std::forward<_Tp>(__arg)) |
| 1089 | { } |
| 1090 | |
| 1091 | #if __cpp_explicit_this_parameter |
| 1092 | template<typename _Self, typename _Range> |
| 1093 | requires __adaptor_invocable<_Adaptor, _Range, __like_t<_Self, _Arg>> |
| 1094 | constexpr auto |
| 1095 | operator()(this _Self&& __self, _Range&& __r) |
| 1096 | { |
| 1097 | return _Adaptor{}(std::forward<_Range>(__r), |
| 1098 | __like_t<_Self, _Partial>(__self)._M_arg); |
| 1099 | } |
| 1100 | #else |
| 1101 | template<typename _Range> |
| 1102 | requires __adaptor_invocable<_Adaptor, _Range, const _Arg&> |
| 1103 | constexpr auto |
| 1104 | operator()(_Range&& __r) const & |
| 1105 | { return _Adaptor{}(std::forward<_Range>(__r), _M_arg); } |
| 1106 | |
| 1107 | template<typename _Range> |
| 1108 | requires __adaptor_invocable<_Adaptor, _Range, _Arg> |
| 1109 | constexpr auto |
| 1110 | operator()(_Range&& __r) && |
| 1111 | { return _Adaptor{}(std::forward<_Range>(__r), std::move(_M_arg)); } |
| 1112 | |
| 1113 | template<typename _Range> |
| 1114 | constexpr auto |
| 1115 | operator()(_Range&& __r) const && = delete; |
| 1116 | #endif |
| 1117 | }; |
| 1118 | |
| 1119 | // Partial specialization of the primary template for the case where the extra |
| 1120 | // arguments of the adaptor can always be safely and efficiently forwarded by |
| 1121 | // const reference. This lets us get away with a single operator() overload, |
| 1122 | // which makes overload resolution failure diagnostics more concise. |
| 1123 | template<typename _Adaptor, typename... _Args> |
| 1124 | requires __adaptor_has_simple_extra_args<_Adaptor, _Args...> |
| 1125 | && (is_trivially_copy_constructible_v<_Args> && ...) |
| 1126 | struct _Partial<_Adaptor, _Args...> : _RangeAdaptorClosure<_Partial<_Adaptor, _Args...>> |
| 1127 | { |
| 1128 | tuple<_Args...> _M_args; |
| 1129 | |
| 1130 | template<typename... _Ts> |
| 1131 | constexpr |
| 1132 | _Partial(int, _Ts&&... __args) |
| 1133 | : _M_args(std::forward<_Ts>(__args)...) |
| 1134 | { } |
| 1135 | |
| 1136 | // Invoke _Adaptor with arguments __r, const _M_args&... regardless |
| 1137 | // of the value category of this _Partial object. |
| 1138 | template<typename _Range> |
| 1139 | requires __adaptor_invocable<_Adaptor, _Range, const _Args&...> |
| 1140 | constexpr auto |
| 1141 | operator()(_Range&& __r) const |
| 1142 | { |
| 1143 | auto __forwarder = [&__r] (const auto&... __args) { |
| 1144 | return _Adaptor{}(std::forward<_Range>(__r), __args...); |
| 1145 | }; |
| 1146 | return std::apply(__forwarder, _M_args); |
| 1147 | } |
| 1148 | |
| 1149 | static constexpr bool _S_has_simple_call_op = true; |
| 1150 | }; |
| 1151 | |
| 1152 | // A lightweight specialization of the above template for the common case |
| 1153 | // where _Adaptor accepts a single extra argument. |
| 1154 | template<typename _Adaptor, typename _Arg> |
| 1155 | requires __adaptor_has_simple_extra_args<_Adaptor, _Arg> |
| 1156 | && is_trivially_copy_constructible_v<_Arg> |
| 1157 | struct _Partial<_Adaptor, _Arg> : _RangeAdaptorClosure<_Partial<_Adaptor, _Arg>> |
| 1158 | { |
| 1159 | _Arg _M_arg; |
| 1160 | |
| 1161 | template<typename _Tp> |
| 1162 | constexpr |
| 1163 | _Partial(int, _Tp&& __arg) |
| 1164 | : _M_arg(std::forward<_Tp>(__arg)) |
| 1165 | { } |
| 1166 | |
| 1167 | template<typename _Range> |
| 1168 | requires __adaptor_invocable<_Adaptor, _Range, const _Arg&> |
| 1169 | constexpr auto |
| 1170 | operator()(_Range&& __r) const |
| 1171 | { return _Adaptor{}(std::forward<_Range>(__r), _M_arg); } |
| 1172 | |
| 1173 | static constexpr bool _S_has_simple_call_op = true; |
| 1174 | }; |
| 1175 | |
| 1176 | template<typename _Lhs, typename _Rhs, typename _Range> |
| 1177 | concept __pipe_invocable |
| 1178 | = requires { std::declval<_Rhs>()(std::declval<_Lhs>()(std::declval<_Range>())); }; |
| 1179 | |
| 1180 | // A range adaptor closure that represents composition of the range |
| 1181 | // adaptor closures _Lhs and _Rhs. |
| 1182 | template<typename _Lhs, typename _Rhs> |
| 1183 | struct _Pipe : _RangeAdaptorClosure<_Pipe<_Lhs, _Rhs>> |
| 1184 | { |
| 1185 | [[no_unique_address]] _Lhs _M_lhs; |
| 1186 | [[no_unique_address]] _Rhs _M_rhs; |
| 1187 | |
| 1188 | template<typename _Tp, typename _Up> |
| 1189 | constexpr |
| 1190 | _Pipe(_Tp&& __lhs, _Up&& __rhs) |
| 1191 | : _M_lhs(std::forward<_Tp>(__lhs)), _M_rhs(std::forward<_Up>(__rhs)) |
| 1192 | { } |
| 1193 | |
| 1194 | // Invoke _M_rhs(_M_lhs(__r)) according to the value category of this |
| 1195 | // range adaptor closure object. |
| 1196 | #if __cpp_explicit_this_parameter |
| 1197 | template<typename _Self, typename _Range> |
| 1198 | requires __pipe_invocable<__like_t<_Self, _Lhs>, __like_t<_Self, _Rhs>, _Range> |
| 1199 | constexpr auto |
| 1200 | operator()(this _Self&& __self, _Range&& __r) |
| 1201 | { |
| 1202 | return (__like_t<_Self, _Pipe>(__self)._M_rhs |
| 1203 | (__like_t<_Self, _Pipe>(__self)._M_lhs |
| 1204 | (std::forward<_Range>(__r)))); |
| 1205 | } |
| 1206 | #else |
| 1207 | template<typename _Range> |
| 1208 | requires __pipe_invocable<const _Lhs&, const _Rhs&, _Range> |
| 1209 | constexpr auto |
| 1210 | operator()(_Range&& __r) const & |
| 1211 | { return _M_rhs(_M_lhs(std::forward<_Range>(__r))); } |
| 1212 | |
| 1213 | template<typename _Range> |
| 1214 | requires __pipe_invocable<_Lhs, _Rhs, _Range> |
| 1215 | constexpr auto |
| 1216 | operator()(_Range&& __r) && |
| 1217 | { return std::move(_M_rhs)(std::move(_M_lhs)(std::forward<_Range>(__r))); } |
| 1218 | |
| 1219 | template<typename _Range> |
| 1220 | constexpr auto |
| 1221 | operator()(_Range&& __r) const && = delete; |
| 1222 | #endif |
| 1223 | }; |
| 1224 | |
| 1225 | // A partial specialization of the above primary template for the case where |
| 1226 | // both adaptor operands have a simple operator(). This in turn lets us |
| 1227 | // implement composition using a single simple operator(), which makes |
| 1228 | // overload resolution failure diagnostics more concise. |
| 1229 | template<typename _Lhs, typename _Rhs> |
| 1230 | requires __closure_has_simple_call_op<_Lhs> |
| 1231 | && __closure_has_simple_call_op<_Rhs> |
| 1232 | struct _Pipe<_Lhs, _Rhs> : _RangeAdaptorClosure<_Pipe<_Lhs, _Rhs>> |
| 1233 | { |
| 1234 | [[no_unique_address]] _Lhs _M_lhs; |
| 1235 | [[no_unique_address]] _Rhs _M_rhs; |
| 1236 | |
| 1237 | template<typename _Tp, typename _Up> |
| 1238 | constexpr |
| 1239 | _Pipe(_Tp&& __lhs, _Up&& __rhs) |
| 1240 | : _M_lhs(std::forward<_Tp>(__lhs)), _M_rhs(std::forward<_Up>(__rhs)) |
| 1241 | { } |
| 1242 | |
| 1243 | template<typename _Range> |
| 1244 | requires __pipe_invocable<const _Lhs&, const _Rhs&, _Range> |
| 1245 | constexpr auto |
| 1246 | operator()(_Range&& __r) const |
| 1247 | { return _M_rhs(_M_lhs(std::forward<_Range>(__r))); } |
| 1248 | |
| 1249 | static constexpr bool _S_has_simple_call_op = true; |
| 1250 | }; |
| 1251 | } // namespace views::__adaptor |
| 1252 | |
| 1253 | #if __cpp_lib_ranges >= 202202L |
| 1254 | // P2387R3 Pipe support for user-defined range adaptors |
| 1255 | template<typename _Derived> |
| 1256 | requires is_class_v<_Derived> && same_as<_Derived, remove_cv_t<_Derived>> |
| 1257 | class range_adaptor_closure |
| 1258 | : public views::__adaptor::_RangeAdaptorClosure<_Derived> |
| 1259 | { }; |
| 1260 | #endif |
| 1261 | |
| 1262 | template<range _Range> requires is_object_v<_Range> |
| 1263 | class ref_view : public view_interface<ref_view<_Range>> |
| 1264 | { |
| 1265 | private: |
| 1266 | _Range* _M_r; |
| 1267 | |
| 1268 | static void _S_fun(_Range&); // not defined |
| 1269 | static void _S_fun(_Range&&) = delete; |
| 1270 | |
| 1271 | public: |
| 1272 | template<__detail::__different_from<ref_view> _Tp> |
| 1273 | requires convertible_to<_Tp, _Range&> |
| 1274 | && requires { _S_fun(declval<_Tp>()); } |
| 1275 | constexpr |
| 1276 | ref_view(_Tp&& __t) |
| 1277 | noexcept(noexcept(static_cast<_Range&>(std::declval<_Tp>()))) |
| 1278 | : _M_r(std::__addressof(static_cast<_Range&>(std::forward<_Tp>(__t)))) |
| 1279 | { } |
| 1280 | |
| 1281 | constexpr _Range& |
| 1282 | base() const |
| 1283 | { return *_M_r; } |
| 1284 | |
| 1285 | constexpr iterator_t<_Range> |
| 1286 | begin() const |
| 1287 | { return ranges::begin(*_M_r); } |
| 1288 | |
| 1289 | constexpr sentinel_t<_Range> |
| 1290 | end() const |
| 1291 | { return ranges::end(*_M_r); } |
| 1292 | |
| 1293 | constexpr bool |
| 1294 | empty() const requires requires { ranges::empty(*_M_r); } |
| 1295 | { return ranges::empty(*_M_r); } |
| 1296 | |
| 1297 | constexpr auto |
| 1298 | size() const requires sized_range<_Range> |
| 1299 | { return ranges::size(*_M_r); } |
| 1300 | |
| 1301 | constexpr auto |
| 1302 | data() const requires contiguous_range<_Range> |
| 1303 | { return ranges::data(*_M_r); } |
| 1304 | }; |
| 1305 | |
| 1306 | template<typename _Range> |
| 1307 | ref_view(_Range&) -> ref_view<_Range>; |
| 1308 | |
| 1309 | template<typename _Tp> |
| 1310 | inline constexpr bool enable_borrowed_range<ref_view<_Tp>> = true; |
| 1311 | |
| 1312 | template<range _Range> |
| 1313 | requires movable<_Range> |
| 1314 | && (!__detail::__is_initializer_list<remove_cv_t<_Range>>) |
| 1315 | class owning_view : public view_interface<owning_view<_Range>> |
| 1316 | { |
| 1317 | private: |
| 1318 | _Range _M_r = _Range(); |
| 1319 | |
| 1320 | public: |
| 1321 | owning_view() requires default_initializable<_Range> = default; |
| 1322 | |
| 1323 | constexpr |
| 1324 | owning_view(_Range&& __t) |
| 1325 | noexcept(is_nothrow_move_constructible_v<_Range>) |
| 1326 | : _M_r(std::move(__t)) |
| 1327 | { } |
| 1328 | |
| 1329 | owning_view(owning_view&&) = default; |
| 1330 | owning_view& operator=(owning_view&&) = default; |
| 1331 | |
| 1332 | constexpr _Range& |
| 1333 | base() & noexcept |
| 1334 | { return _M_r; } |
| 1335 | |
| 1336 | constexpr const _Range& |
| 1337 | base() const& noexcept |
| 1338 | { return _M_r; } |
| 1339 | |
| 1340 | constexpr _Range&& |
| 1341 | base() && noexcept |
| 1342 | { return std::move(_M_r); } |
| 1343 | |
| 1344 | constexpr const _Range&& |
| 1345 | base() const&& noexcept |
| 1346 | { return std::move(_M_r); } |
| 1347 | |
| 1348 | constexpr iterator_t<_Range> |
| 1349 | begin() |
| 1350 | { return ranges::begin(_M_r); } |
| 1351 | |
| 1352 | constexpr sentinel_t<_Range> |
| 1353 | end() |
| 1354 | { return ranges::end(_M_r); } |
| 1355 | |
| 1356 | constexpr auto |
| 1357 | begin() const requires range<const _Range> |
| 1358 | { return ranges::begin(_M_r); } |
| 1359 | |
| 1360 | constexpr auto |
| 1361 | end() const requires range<const _Range> |
| 1362 | { return ranges::end(_M_r); } |
| 1363 | |
| 1364 | constexpr bool |
| 1365 | empty() requires requires { ranges::empty(_M_r); } |
| 1366 | { return ranges::empty(_M_r); } |
| 1367 | |
| 1368 | constexpr bool |
| 1369 | empty() const requires requires { ranges::empty(_M_r); } |
| 1370 | { return ranges::empty(_M_r); } |
| 1371 | |
| 1372 | constexpr auto |
| 1373 | size() requires sized_range<_Range> |
| 1374 | { return ranges::size(_M_r); } |
| 1375 | |
| 1376 | constexpr auto |
| 1377 | size() const requires sized_range<const _Range> |
| 1378 | { return ranges::size(_M_r); } |
| 1379 | |
| 1380 | constexpr auto |
| 1381 | data() requires contiguous_range<_Range> |
| 1382 | { return ranges::data(_M_r); } |
| 1383 | |
| 1384 | constexpr auto |
| 1385 | data() const requires contiguous_range<const _Range> |
| 1386 | { return ranges::data(_M_r); } |
| 1387 | }; |
| 1388 | |
| 1389 | template<typename _Tp> |
| 1390 | inline constexpr bool enable_borrowed_range<owning_view<_Tp>> |
| 1391 | = enable_borrowed_range<_Tp>; |
| 1392 | |
| 1393 | namespace views |
| 1394 | { |
| 1395 | namespace __detail |
| 1396 | { |
| 1397 | template<typename _Range> |
| 1398 | concept __can_ref_view = requires { ref_view{std::declval<_Range>()}; }; |
| 1399 | |
| 1400 | template<typename _Range> |
| 1401 | concept __can_owning_view = requires { owning_view{std::declval<_Range>()}; }; |
| 1402 | } // namespace __detail |
| 1403 | |
| 1404 | struct _All : __adaptor::_RangeAdaptorClosure<_All> |
| 1405 | { |
| 1406 | template<typename _Range> |
| 1407 | static constexpr bool |
| 1408 | _S_noexcept() |
| 1409 | { |
| 1410 | if constexpr (view<decay_t<_Range>>) |
| 1411 | return is_nothrow_constructible_v<decay_t<_Range>, _Range>; |
| 1412 | else if constexpr (__detail::__can_ref_view<_Range>) |
| 1413 | return true; |
| 1414 | else |
| 1415 | return noexcept(owning_view{std::declval<_Range>()}); |
| 1416 | } |
| 1417 | |
| 1418 | template<viewable_range _Range> |
| 1419 | requires view<decay_t<_Range>> |
| 1420 | || __detail::__can_ref_view<_Range> |
| 1421 | || __detail::__can_owning_view<_Range> |
| 1422 | constexpr auto |
| 1423 | operator() [[nodiscard]] (_Range&& __r) const |
| 1424 | noexcept(_S_noexcept<_Range>()) |
| 1425 | { |
| 1426 | if constexpr (view<decay_t<_Range>>) |
| 1427 | return std::forward<_Range>(__r); |
| 1428 | else if constexpr (__detail::__can_ref_view<_Range>) |
| 1429 | return ref_view{std::forward<_Range>(__r)}; |
| 1430 | else |
| 1431 | return owning_view{std::forward<_Range>(__r)}; |
| 1432 | } |
| 1433 | |
| 1434 | static constexpr bool _S_has_simple_call_op = true; |
| 1435 | }; |
| 1436 | |
| 1437 | inline constexpr _All all; |
| 1438 | |
| 1439 | template<viewable_range _Range> |
| 1440 | using all_t = decltype(all(std::declval<_Range>())); |
| 1441 | } // namespace views |
| 1442 | |
| 1443 | namespace __detail |
| 1444 | { |
| 1445 | template<typename _Tp> |
| 1446 | struct __non_propagating_cache |
| 1447 | { |
| 1448 | // When _Tp is not an object type (e.g. is a reference type), we make |
| 1449 | // __non_propagating_cache<_Tp> empty rather than ill-formed so that |
| 1450 | // users can easily conditionally declare data members with this type |
| 1451 | // (such as join_view::_M_inner). |
| 1452 | }; |
| 1453 | |
| 1454 | template<typename _Tp> |
| 1455 | requires is_object_v<_Tp> |
| 1456 | struct __non_propagating_cache<_Tp> |
| 1457 | : protected _Optional_base<_Tp> |
| 1458 | { |
| 1459 | __non_propagating_cache() = default; |
| 1460 | |
| 1461 | constexpr |
| 1462 | __non_propagating_cache(const __non_propagating_cache&) noexcept |
| 1463 | { } |
| 1464 | |
| 1465 | constexpr |
| 1466 | __non_propagating_cache(__non_propagating_cache&& __other) noexcept |
| 1467 | { __other._M_reset(); } |
| 1468 | |
| 1469 | constexpr __non_propagating_cache& |
| 1470 | operator=(const __non_propagating_cache& __other) noexcept |
| 1471 | { |
| 1472 | if (std::__addressof(__other) != this) |
| 1473 | this->_M_reset(); |
| 1474 | return *this; |
| 1475 | } |
| 1476 | |
| 1477 | constexpr __non_propagating_cache& |
| 1478 | operator=(__non_propagating_cache&& __other) noexcept |
| 1479 | { |
| 1480 | this->_M_reset(); |
| 1481 | __other._M_reset(); |
| 1482 | return *this; |
| 1483 | } |
| 1484 | |
| 1485 | constexpr __non_propagating_cache& |
| 1486 | operator=(_Tp __val) |
| 1487 | { |
| 1488 | this->_M_reset(); |
| 1489 | this->_M_payload._M_construct(std::move(__val)); |
| 1490 | return *this; |
| 1491 | } |
| 1492 | |
| 1493 | constexpr explicit |
| 1494 | operator bool() const noexcept |
| 1495 | { return this->_M_is_engaged(); } |
| 1496 | |
| 1497 | constexpr _Tp& |
| 1498 | operator*() noexcept |
| 1499 | { return this->_M_get(); } |
| 1500 | |
| 1501 | constexpr const _Tp& |
| 1502 | operator*() const noexcept |
| 1503 | { return this->_M_get(); } |
| 1504 | |
| 1505 | template<typename _Iter> |
| 1506 | constexpr _Tp& |
| 1507 | _M_emplace_deref(const _Iter& __i) |
| 1508 | { |
| 1509 | this->_M_reset(); |
| 1510 | auto __f = [] (auto& __x) { return *__x; }; |
| 1511 | this->_M_payload._M_apply(_Optional_func{__f}, __i); |
| 1512 | return this->_M_get(); |
| 1513 | } |
| 1514 | }; |
| 1515 | |
| 1516 | template<range _Range> |
| 1517 | struct _CachedPosition |
| 1518 | { |
| 1519 | constexpr bool |
| 1520 | _M_has_value() const |
| 1521 | { return false; } |
| 1522 | |
| 1523 | constexpr iterator_t<_Range> |
| 1524 | _M_get(const _Range&) const |
| 1525 | { |
| 1526 | __glibcxx_assert(false); |
| 1527 | __builtin_unreachable(); |
| 1528 | } |
| 1529 | |
| 1530 | constexpr void |
| 1531 | _M_set(const _Range&, const iterator_t<_Range>&) const |
| 1532 | { } |
| 1533 | }; |
| 1534 | |
| 1535 | template<forward_range _Range> |
| 1536 | struct _CachedPosition<_Range> |
| 1537 | : protected __non_propagating_cache<iterator_t<_Range>> |
| 1538 | { |
| 1539 | constexpr bool |
| 1540 | _M_has_value() const |
| 1541 | { return this->_M_is_engaged(); } |
| 1542 | |
| 1543 | constexpr iterator_t<_Range> |
| 1544 | _M_get(const _Range&) const |
| 1545 | { |
| 1546 | __glibcxx_assert(_M_has_value()); |
| 1547 | return **this; |
| 1548 | } |
| 1549 | |
| 1550 | constexpr void |
| 1551 | _M_set(const _Range&, const iterator_t<_Range>& __it) |
| 1552 | { |
| 1553 | __glibcxx_assert(!_M_has_value()); |
| 1554 | std::construct_at(std::__addressof(this->_M_payload._M_payload), |
| 1555 | in_place, __it); |
| 1556 | this->_M_payload._M_engaged = true; |
| 1557 | } |
| 1558 | }; |
| 1559 | |
| 1560 | template<random_access_range _Range> |
| 1561 | requires (sizeof(range_difference_t<_Range>) |
| 1562 | <= sizeof(iterator_t<_Range>)) |
| 1563 | struct _CachedPosition<_Range> |
| 1564 | { |
| 1565 | private: |
| 1566 | range_difference_t<_Range> _M_offset = -1; |
| 1567 | |
| 1568 | public: |
| 1569 | _CachedPosition() = default; |
| 1570 | |
| 1571 | constexpr |
| 1572 | _CachedPosition(const _CachedPosition&) = default; |
| 1573 | |
| 1574 | constexpr |
| 1575 | _CachedPosition(_CachedPosition&& __other) noexcept |
| 1576 | { *this = std::move(__other); } |
| 1577 | |
| 1578 | constexpr _CachedPosition& |
| 1579 | operator=(const _CachedPosition&) = default; |
| 1580 | |
| 1581 | constexpr _CachedPosition& |
| 1582 | operator=(_CachedPosition&& __other) noexcept |
| 1583 | { |
| 1584 | // Propagate the cached offset, but invalidate the source. |
| 1585 | _M_offset = __other._M_offset; |
| 1586 | __other._M_offset = -1; |
| 1587 | return *this; |
| 1588 | } |
| 1589 | |
| 1590 | constexpr bool |
| 1591 | _M_has_value() const |
| 1592 | { return _M_offset >= 0; } |
| 1593 | |
| 1594 | constexpr iterator_t<_Range> |
| 1595 | _M_get(_Range& __r) const |
| 1596 | { |
| 1597 | __glibcxx_assert(_M_has_value()); |
| 1598 | return ranges::begin(__r) + _M_offset; |
| 1599 | } |
| 1600 | |
| 1601 | constexpr void |
| 1602 | _M_set(_Range& __r, const iterator_t<_Range>& __it) |
| 1603 | { |
| 1604 | __glibcxx_assert(!_M_has_value()); |
| 1605 | _M_offset = __it - ranges::begin(__r); |
| 1606 | } |
| 1607 | }; |
| 1608 | } // namespace __detail |
| 1609 | |
| 1610 | namespace __detail |
| 1611 | { |
| 1612 | template<typename _Base> |
| 1613 | struct __filter_view_iter_cat |
| 1614 | { }; |
| 1615 | |
| 1616 | template<forward_range _Base> |
| 1617 | struct __filter_view_iter_cat<_Base> |
| 1618 | { |
| 1619 | private: |
| 1620 | static auto |
| 1621 | _S_iter_cat() |
| 1622 | { |
| 1623 | using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 1624 | if constexpr (derived_from<_Cat, bidirectional_iterator_tag>) |
| 1625 | return bidirectional_iterator_tag{}; |
| 1626 | else if constexpr (derived_from<_Cat, forward_iterator_tag>) |
| 1627 | return forward_iterator_tag{}; |
| 1628 | else |
| 1629 | return _Cat{}; |
| 1630 | } |
| 1631 | public: |
| 1632 | using iterator_category = decltype(_S_iter_cat()); |
| 1633 | }; |
| 1634 | } // namespace __detail |
| 1635 | |
| 1636 | template<input_range _Vp, |
| 1637 | indirect_unary_predicate<iterator_t<_Vp>> _Pred> |
| 1638 | requires view<_Vp> && is_object_v<_Pred> |
| 1639 | class filter_view : public view_interface<filter_view<_Vp, _Pred>> |
| 1640 | { |
| 1641 | private: |
| 1642 | struct _Sentinel; |
| 1643 | |
| 1644 | struct _Iterator : __detail::__filter_view_iter_cat<_Vp> |
| 1645 | { |
| 1646 | private: |
| 1647 | static constexpr auto |
| 1648 | _S_iter_concept() |
| 1649 | { |
| 1650 | if constexpr (bidirectional_range<_Vp>) |
| 1651 | return bidirectional_iterator_tag{}; |
| 1652 | else if constexpr (forward_range<_Vp>) |
| 1653 | return forward_iterator_tag{}; |
| 1654 | else |
| 1655 | return input_iterator_tag{}; |
| 1656 | } |
| 1657 | |
| 1658 | friend filter_view; |
| 1659 | |
| 1660 | using _Vp_iter = iterator_t<_Vp>; |
| 1661 | |
| 1662 | _Vp_iter _M_current = _Vp_iter(); |
| 1663 | filter_view* _M_parent = nullptr; |
| 1664 | |
| 1665 | public: |
| 1666 | using iterator_concept = decltype(_S_iter_concept()); |
| 1667 | // iterator_category defined in __filter_view_iter_cat |
| 1668 | using value_type = range_value_t<_Vp>; |
| 1669 | using difference_type = range_difference_t<_Vp>; |
| 1670 | |
| 1671 | _Iterator() requires default_initializable<_Vp_iter> = default; |
| 1672 | |
| 1673 | constexpr |
| 1674 | _Iterator(filter_view* __parent, _Vp_iter __current) |
| 1675 | : _M_current(std::move(__current)), |
| 1676 | _M_parent(__parent) |
| 1677 | { } |
| 1678 | |
| 1679 | constexpr const _Vp_iter& |
| 1680 | base() const & noexcept |
| 1681 | { return _M_current; } |
| 1682 | |
| 1683 | constexpr _Vp_iter |
| 1684 | base() && |
| 1685 | { return std::move(_M_current); } |
| 1686 | |
| 1687 | constexpr range_reference_t<_Vp> |
| 1688 | operator*() const |
| 1689 | { return *_M_current; } |
| 1690 | |
| 1691 | constexpr _Vp_iter |
| 1692 | operator->() const |
| 1693 | requires __detail::__has_arrow<_Vp_iter> |
| 1694 | && copyable<_Vp_iter> |
| 1695 | { return _M_current; } |
| 1696 | |
| 1697 | constexpr _Iterator& |
| 1698 | operator++() |
| 1699 | { |
| 1700 | _M_current = ranges::find_if(std::move(++_M_current), |
| 1701 | ranges::end(_M_parent->_M_base), |
| 1702 | std::ref(*_M_parent->_M_pred)); |
| 1703 | return *this; |
| 1704 | } |
| 1705 | |
| 1706 | constexpr void |
| 1707 | operator++(int) |
| 1708 | { ++*this; } |
| 1709 | |
| 1710 | constexpr _Iterator |
| 1711 | operator++(int) requires forward_range<_Vp> |
| 1712 | { |
| 1713 | auto __tmp = *this; |
| 1714 | ++*this; |
| 1715 | return __tmp; |
| 1716 | } |
| 1717 | |
| 1718 | constexpr _Iterator& |
| 1719 | operator--() requires bidirectional_range<_Vp> |
| 1720 | { |
| 1721 | do |
| 1722 | --_M_current; |
| 1723 | while (!std::__invoke(*_M_parent->_M_pred, *_M_current)); |
| 1724 | return *this; |
| 1725 | } |
| 1726 | |
| 1727 | constexpr _Iterator |
| 1728 | operator--(int) requires bidirectional_range<_Vp> |
| 1729 | { |
| 1730 | auto __tmp = *this; |
| 1731 | --*this; |
| 1732 | return __tmp; |
| 1733 | } |
| 1734 | |
| 1735 | friend constexpr bool |
| 1736 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 1737 | requires equality_comparable<_Vp_iter> |
| 1738 | { return __x._M_current == __y._M_current; } |
| 1739 | |
| 1740 | friend constexpr range_rvalue_reference_t<_Vp> |
| 1741 | iter_move(const _Iterator& __i) |
| 1742 | noexcept(noexcept(ranges::iter_move(__i._M_current))) |
| 1743 | { return ranges::iter_move(__i._M_current); } |
| 1744 | |
| 1745 | friend constexpr void |
| 1746 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 1747 | noexcept(noexcept(ranges::iter_swap(__x._M_current, __y._M_current))) |
| 1748 | requires indirectly_swappable<_Vp_iter> |
| 1749 | { ranges::iter_swap(__x._M_current, __y._M_current); } |
| 1750 | }; |
| 1751 | |
| 1752 | struct _Sentinel |
| 1753 | { |
| 1754 | private: |
| 1755 | sentinel_t<_Vp> _M_end = sentinel_t<_Vp>(); |
| 1756 | |
| 1757 | constexpr bool |
| 1758 | __equal(const _Iterator& __i) const |
| 1759 | { return __i._M_current == _M_end; } |
| 1760 | |
| 1761 | public: |
| 1762 | _Sentinel() = default; |
| 1763 | |
| 1764 | constexpr explicit |
| 1765 | _Sentinel(filter_view* __parent) |
| 1766 | : _M_end(ranges::end(__parent->_M_base)) |
| 1767 | { } |
| 1768 | |
| 1769 | constexpr sentinel_t<_Vp> |
| 1770 | base() const |
| 1771 | { return _M_end; } |
| 1772 | |
| 1773 | friend constexpr bool |
| 1774 | operator==(const _Iterator& __x, const _Sentinel& __y) |
| 1775 | { return __y.__equal(__x); } |
| 1776 | }; |
| 1777 | |
| 1778 | _Vp _M_base = _Vp(); |
| 1779 | [[no_unique_address]] __detail::__box<_Pred> _M_pred; |
| 1780 | [[no_unique_address]] __detail::_CachedPosition<_Vp> _M_cached_begin; |
| 1781 | |
| 1782 | public: |
| 1783 | filter_view() requires (default_initializable<_Vp> |
| 1784 | && default_initializable<_Pred>) |
| 1785 | = default; |
| 1786 | |
| 1787 | constexpr |
| 1788 | filter_view(_Vp __base, _Pred __pred) |
| 1789 | : _M_base(std::move(__base)), _M_pred(std::move(__pred)) |
| 1790 | { } |
| 1791 | |
| 1792 | constexpr _Vp |
| 1793 | base() const& requires copy_constructible<_Vp> |
| 1794 | { return _M_base; } |
| 1795 | |
| 1796 | constexpr _Vp |
| 1797 | base() && |
| 1798 | { return std::move(_M_base); } |
| 1799 | |
| 1800 | constexpr const _Pred& |
| 1801 | pred() const |
| 1802 | { return *_M_pred; } |
| 1803 | |
| 1804 | constexpr _Iterator |
| 1805 | begin() |
| 1806 | { |
| 1807 | if (_M_cached_begin._M_has_value()) |
| 1808 | return {this, _M_cached_begin._M_get(_M_base)}; |
| 1809 | |
| 1810 | __glibcxx_assert(_M_pred.has_value()); |
| 1811 | auto __it = ranges::find_if(ranges::begin(_M_base), |
| 1812 | ranges::end(_M_base), |
| 1813 | std::ref(*_M_pred)); |
| 1814 | _M_cached_begin._M_set(_M_base, __it); |
| 1815 | return {this, std::move(__it)}; |
| 1816 | } |
| 1817 | |
| 1818 | constexpr auto |
| 1819 | end() |
| 1820 | { |
| 1821 | if constexpr (common_range<_Vp>) |
| 1822 | return _Iterator{this, ranges::end(_M_base)}; |
| 1823 | else |
| 1824 | return _Sentinel{this}; |
| 1825 | } |
| 1826 | }; |
| 1827 | |
| 1828 | template<typename _Range, typename _Pred> |
| 1829 | filter_view(_Range&&, _Pred) -> filter_view<views::all_t<_Range>, _Pred>; |
| 1830 | |
| 1831 | namespace views |
| 1832 | { |
| 1833 | namespace __detail |
| 1834 | { |
| 1835 | template<typename _Range, typename _Pred> |
| 1836 | concept __can_filter_view |
| 1837 | = requires { filter_view(std::declval<_Range>(), std::declval<_Pred>()); }; |
| 1838 | } // namespace __detail |
| 1839 | |
| 1840 | struct _Filter : __adaptor::_RangeAdaptor<_Filter> |
| 1841 | { |
| 1842 | template<viewable_range _Range, typename _Pred> |
| 1843 | requires __detail::__can_filter_view<_Range, _Pred> |
| 1844 | constexpr auto |
| 1845 | operator() [[nodiscard]] (_Range&& __r, _Pred&& __p) const |
| 1846 | { |
| 1847 | return filter_view(std::forward<_Range>(__r), std::forward<_Pred>(__p)); |
| 1848 | } |
| 1849 | |
| 1850 | using _RangeAdaptor<_Filter>::operator(); |
| 1851 | static constexpr int _S_arity = 2; |
| 1852 | static constexpr bool _S_has_simple_extra_args = true; |
| 1853 | }; |
| 1854 | |
| 1855 | inline constexpr _Filter filter; |
| 1856 | } // namespace views |
| 1857 | |
| 1858 | #if __cpp_lib_ranges >= 202207L // C++ >= 23 |
| 1859 | template<input_range _Vp, move_constructible _Fp> |
| 1860 | #else |
| 1861 | template<input_range _Vp, copy_constructible _Fp> |
| 1862 | #endif |
| 1863 | requires view<_Vp> && is_object_v<_Fp> |
| 1864 | && regular_invocable<_Fp&, range_reference_t<_Vp>> |
| 1865 | && std::__detail::__can_reference<invoke_result_t<_Fp&, |
| 1866 | range_reference_t<_Vp>>> |
| 1867 | class transform_view : public view_interface<transform_view<_Vp, _Fp>> |
| 1868 | { |
| 1869 | private: |
| 1870 | template<bool _Const> |
| 1871 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 1872 | |
| 1873 | template<bool _Const> |
| 1874 | struct __iter_cat |
| 1875 | { }; |
| 1876 | |
| 1877 | template<bool _Const> |
| 1878 | requires forward_range<_Base<_Const>> |
| 1879 | struct __iter_cat<_Const> |
| 1880 | { |
| 1881 | private: |
| 1882 | static auto |
| 1883 | _S_iter_cat() |
| 1884 | { |
| 1885 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 1886 | // 3564. transform_view::iterator<true>::value_type and |
| 1887 | // iterator_category should use const F& |
| 1888 | using _Base = transform_view::_Base<_Const>; |
| 1889 | using _Res = invoke_result_t<__maybe_const_t<_Const, _Fp>&, |
| 1890 | range_reference_t<_Base>>; |
| 1891 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 1892 | // 3798. Rvalue reference and iterator_category |
| 1893 | if constexpr (is_reference_v<_Res>) |
| 1894 | { |
| 1895 | using _Cat |
| 1896 | = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 1897 | if constexpr (derived_from<_Cat, contiguous_iterator_tag>) |
| 1898 | return random_access_iterator_tag{}; |
| 1899 | else |
| 1900 | return _Cat{}; |
| 1901 | } |
| 1902 | else |
| 1903 | return input_iterator_tag{}; |
| 1904 | } |
| 1905 | public: |
| 1906 | using iterator_category = decltype(_S_iter_cat()); |
| 1907 | }; |
| 1908 | |
| 1909 | template<bool _Const> |
| 1910 | struct _Sentinel; |
| 1911 | |
| 1912 | template<bool _Const> |
| 1913 | struct _Iterator : __iter_cat<_Const> |
| 1914 | { |
| 1915 | private: |
| 1916 | using _Parent = __detail::__maybe_const_t<_Const, transform_view>; |
| 1917 | using _Base = transform_view::_Base<_Const>; |
| 1918 | |
| 1919 | static auto |
| 1920 | _S_iter_concept() |
| 1921 | { |
| 1922 | if constexpr (random_access_range<_Base>) |
| 1923 | return random_access_iterator_tag{}; |
| 1924 | else if constexpr (bidirectional_range<_Base>) |
| 1925 | return bidirectional_iterator_tag{}; |
| 1926 | else if constexpr (forward_range<_Base>) |
| 1927 | return forward_iterator_tag{}; |
| 1928 | else |
| 1929 | return input_iterator_tag{}; |
| 1930 | } |
| 1931 | |
| 1932 | using _Base_iter = iterator_t<_Base>; |
| 1933 | |
| 1934 | _Base_iter _M_current = _Base_iter(); |
| 1935 | _Parent* _M_parent = nullptr; |
| 1936 | |
| 1937 | public: |
| 1938 | using iterator_concept = decltype(_S_iter_concept()); |
| 1939 | // iterator_category defined in __transform_view_iter_cat |
| 1940 | using value_type |
| 1941 | = remove_cvref_t<invoke_result_t<__maybe_const_t<_Const, _Fp>&, |
| 1942 | range_reference_t<_Base>>>; |
| 1943 | using difference_type = range_difference_t<_Base>; |
| 1944 | |
| 1945 | _Iterator() requires default_initializable<_Base_iter> = default; |
| 1946 | |
| 1947 | constexpr |
| 1948 | _Iterator(_Parent* __parent, _Base_iter __current) |
| 1949 | : _M_current(std::move(__current)), |
| 1950 | _M_parent(__parent) |
| 1951 | { } |
| 1952 | |
| 1953 | constexpr |
| 1954 | _Iterator(_Iterator<!_Const> __i) |
| 1955 | requires _Const |
| 1956 | && convertible_to<iterator_t<_Vp>, _Base_iter> |
| 1957 | : _M_current(std::move(__i._M_current)), _M_parent(__i._M_parent) |
| 1958 | { } |
| 1959 | |
| 1960 | constexpr const _Base_iter& |
| 1961 | base() const & noexcept |
| 1962 | { return _M_current; } |
| 1963 | |
| 1964 | constexpr _Base_iter |
| 1965 | base() && |
| 1966 | { return std::move(_M_current); } |
| 1967 | |
| 1968 | constexpr decltype(auto) |
| 1969 | operator*() const |
| 1970 | noexcept(noexcept(std::__invoke(*_M_parent->_M_fun, *_M_current))) |
| 1971 | { return std::__invoke(*_M_parent->_M_fun, *_M_current); } |
| 1972 | |
| 1973 | constexpr _Iterator& |
| 1974 | operator++() |
| 1975 | { |
| 1976 | ++_M_current; |
| 1977 | return *this; |
| 1978 | } |
| 1979 | |
| 1980 | constexpr void |
| 1981 | operator++(int) |
| 1982 | { ++_M_current; } |
| 1983 | |
| 1984 | constexpr _Iterator |
| 1985 | operator++(int) requires forward_range<_Base> |
| 1986 | { |
| 1987 | auto __tmp = *this; |
| 1988 | ++*this; |
| 1989 | return __tmp; |
| 1990 | } |
| 1991 | |
| 1992 | constexpr _Iterator& |
| 1993 | operator--() requires bidirectional_range<_Base> |
| 1994 | { |
| 1995 | --_M_current; |
| 1996 | return *this; |
| 1997 | } |
| 1998 | |
| 1999 | constexpr _Iterator |
| 2000 | operator--(int) requires bidirectional_range<_Base> |
| 2001 | { |
| 2002 | auto __tmp = *this; |
| 2003 | --*this; |
| 2004 | return __tmp; |
| 2005 | } |
| 2006 | |
| 2007 | constexpr _Iterator& |
| 2008 | operator+=(difference_type __n) requires random_access_range<_Base> |
| 2009 | { |
| 2010 | _M_current += __n; |
| 2011 | return *this; |
| 2012 | } |
| 2013 | |
| 2014 | constexpr _Iterator& |
| 2015 | operator-=(difference_type __n) requires random_access_range<_Base> |
| 2016 | { |
| 2017 | _M_current -= __n; |
| 2018 | return *this; |
| 2019 | } |
| 2020 | |
| 2021 | constexpr decltype(auto) |
| 2022 | operator[](difference_type __n) const |
| 2023 | requires random_access_range<_Base> |
| 2024 | { return std::__invoke(*_M_parent->_M_fun, _M_current[__n]); } |
| 2025 | |
| 2026 | friend constexpr bool |
| 2027 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 2028 | requires equality_comparable<_Base_iter> |
| 2029 | { return __x._M_current == __y._M_current; } |
| 2030 | |
| 2031 | friend constexpr bool |
| 2032 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 2033 | requires random_access_range<_Base> |
| 2034 | { return __x._M_current < __y._M_current; } |
| 2035 | |
| 2036 | friend constexpr bool |
| 2037 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 2038 | requires random_access_range<_Base> |
| 2039 | { return __y < __x; } |
| 2040 | |
| 2041 | friend constexpr bool |
| 2042 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 2043 | requires random_access_range<_Base> |
| 2044 | { return !(__y < __x); } |
| 2045 | |
| 2046 | friend constexpr bool |
| 2047 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 2048 | requires random_access_range<_Base> |
| 2049 | { return !(__x < __y); } |
| 2050 | |
| 2051 | #ifdef __cpp_lib_three_way_comparison |
| 2052 | friend constexpr auto |
| 2053 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 2054 | requires random_access_range<_Base> |
| 2055 | && three_way_comparable<_Base_iter> |
| 2056 | { return __x._M_current <=> __y._M_current; } |
| 2057 | #endif |
| 2058 | |
| 2059 | friend constexpr _Iterator |
| 2060 | operator+(_Iterator __i, difference_type __n) |
| 2061 | requires random_access_range<_Base> |
| 2062 | { return {__i._M_parent, __i._M_current + __n}; } |
| 2063 | |
| 2064 | friend constexpr _Iterator |
| 2065 | operator+(difference_type __n, _Iterator __i) |
| 2066 | requires random_access_range<_Base> |
| 2067 | { return {__i._M_parent, __i._M_current + __n}; } |
| 2068 | |
| 2069 | friend constexpr _Iterator |
| 2070 | operator-(_Iterator __i, difference_type __n) |
| 2071 | requires random_access_range<_Base> |
| 2072 | { return {__i._M_parent, __i._M_current - __n}; } |
| 2073 | |
| 2074 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2075 | // 3483. transform_view::iterator's difference is overconstrained |
| 2076 | friend constexpr difference_type |
| 2077 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 2078 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 2079 | { return __x._M_current - __y._M_current; } |
| 2080 | |
| 2081 | friend constexpr decltype(auto) |
| 2082 | iter_move(const _Iterator& __i) noexcept(noexcept(*__i)) |
| 2083 | { |
| 2084 | if constexpr (is_lvalue_reference_v<decltype(*__i)>) |
| 2085 | return std::move(*__i); |
| 2086 | else |
| 2087 | return *__i; |
| 2088 | } |
| 2089 | |
| 2090 | friend _Iterator<!_Const>; |
| 2091 | template<bool> friend struct _Sentinel; |
| 2092 | }; |
| 2093 | |
| 2094 | template<bool _Const> |
| 2095 | struct _Sentinel |
| 2096 | { |
| 2097 | private: |
| 2098 | using _Parent = __detail::__maybe_const_t<_Const, transform_view>; |
| 2099 | using _Base = transform_view::_Base<_Const>; |
| 2100 | |
| 2101 | template<bool _Const2> |
| 2102 | constexpr auto |
| 2103 | __distance_from(const _Iterator<_Const2>& __i) const |
| 2104 | { return _M_end - __i._M_current; } |
| 2105 | |
| 2106 | template<bool _Const2> |
| 2107 | constexpr bool |
| 2108 | __equal(const _Iterator<_Const2>& __i) const |
| 2109 | { return __i._M_current == _M_end; } |
| 2110 | |
| 2111 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 2112 | |
| 2113 | public: |
| 2114 | _Sentinel() = default; |
| 2115 | |
| 2116 | constexpr explicit |
| 2117 | _Sentinel(sentinel_t<_Base> __end) |
| 2118 | : _M_end(__end) |
| 2119 | { } |
| 2120 | |
| 2121 | constexpr |
| 2122 | _Sentinel(_Sentinel<!_Const> __i) |
| 2123 | requires _Const |
| 2124 | && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 2125 | : _M_end(std::move(__i._M_end)) |
| 2126 | { } |
| 2127 | |
| 2128 | constexpr sentinel_t<_Base> |
| 2129 | base() const |
| 2130 | { return _M_end; } |
| 2131 | |
| 2132 | template<bool _Const2> |
| 2133 | requires sentinel_for<sentinel_t<_Base>, |
| 2134 | iterator_t<__detail::__maybe_const_t<_Const2, _Vp>>> |
| 2135 | friend constexpr bool |
| 2136 | operator==(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 2137 | { return __y.__equal(__x); } |
| 2138 | |
| 2139 | template<bool _Const2, |
| 2140 | typename _Base2 = __detail::__maybe_const_t<_Const2, _Vp>> |
| 2141 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 2142 | friend constexpr range_difference_t<_Base2> |
| 2143 | operator-(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 2144 | { return -__y.__distance_from(__x); } |
| 2145 | |
| 2146 | template<bool _Const2, |
| 2147 | typename _Base2 = __detail::__maybe_const_t<_Const2, _Vp>> |
| 2148 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 2149 | friend constexpr range_difference_t<_Base2> |
| 2150 | operator-(const _Sentinel& __y, const _Iterator<_Const2>& __x) |
| 2151 | { return __y.__distance_from(__x); } |
| 2152 | |
| 2153 | friend _Sentinel<!_Const>; |
| 2154 | }; |
| 2155 | |
| 2156 | _Vp _M_base = _Vp(); |
| 2157 | [[no_unique_address]] __detail::__box<_Fp> _M_fun; |
| 2158 | |
| 2159 | public: |
| 2160 | transform_view() requires (default_initializable<_Vp> |
| 2161 | && default_initializable<_Fp>) |
| 2162 | = default; |
| 2163 | |
| 2164 | constexpr |
| 2165 | transform_view(_Vp __base, _Fp __fun) |
| 2166 | : _M_base(std::move(__base)), _M_fun(std::move(__fun)) |
| 2167 | { } |
| 2168 | |
| 2169 | constexpr _Vp |
| 2170 | base() const& requires copy_constructible<_Vp> |
| 2171 | { return _M_base ; } |
| 2172 | |
| 2173 | constexpr _Vp |
| 2174 | base() && |
| 2175 | { return std::move(_M_base); } |
| 2176 | |
| 2177 | constexpr _Iterator<false> |
| 2178 | begin() |
| 2179 | { return _Iterator<false>{this, ranges::begin(_M_base)}; } |
| 2180 | |
| 2181 | constexpr _Iterator<true> |
| 2182 | begin() const |
| 2183 | requires range<const _Vp> |
| 2184 | && regular_invocable<const _Fp&, range_reference_t<const _Vp>> |
| 2185 | { return _Iterator<true>{this, ranges::begin(_M_base)}; } |
| 2186 | |
| 2187 | constexpr _Sentinel<false> |
| 2188 | end() |
| 2189 | { return _Sentinel<false>{ranges::end(_M_base)}; } |
| 2190 | |
| 2191 | constexpr _Iterator<false> |
| 2192 | end() requires common_range<_Vp> |
| 2193 | { return _Iterator<false>{this, ranges::end(_M_base)}; } |
| 2194 | |
| 2195 | constexpr _Sentinel<true> |
| 2196 | end() const |
| 2197 | requires range<const _Vp> |
| 2198 | && regular_invocable<const _Fp&, range_reference_t<const _Vp>> |
| 2199 | { return _Sentinel<true>{ranges::end(_M_base)}; } |
| 2200 | |
| 2201 | constexpr _Iterator<true> |
| 2202 | end() const |
| 2203 | requires common_range<const _Vp> |
| 2204 | && regular_invocable<const _Fp&, range_reference_t<const _Vp>> |
| 2205 | { return _Iterator<true>{this, ranges::end(_M_base)}; } |
| 2206 | |
| 2207 | constexpr auto |
| 2208 | size() requires sized_range<_Vp> |
| 2209 | { return ranges::size(_M_base); } |
| 2210 | |
| 2211 | constexpr auto |
| 2212 | size() const requires sized_range<const _Vp> |
| 2213 | { return ranges::size(_M_base); } |
| 2214 | }; |
| 2215 | |
| 2216 | template<typename _Range, typename _Fp> |
| 2217 | transform_view(_Range&&, _Fp) -> transform_view<views::all_t<_Range>, _Fp>; |
| 2218 | |
| 2219 | namespace views |
| 2220 | { |
| 2221 | namespace __detail |
| 2222 | { |
| 2223 | template<typename _Range, typename _Fp> |
| 2224 | concept __can_transform_view |
| 2225 | = requires { transform_view(std::declval<_Range>(), std::declval<_Fp>()); }; |
| 2226 | } // namespace __detail |
| 2227 | |
| 2228 | struct _Transform : __adaptor::_RangeAdaptor<_Transform> |
| 2229 | { |
| 2230 | template<viewable_range _Range, typename _Fp> |
| 2231 | requires __detail::__can_transform_view<_Range, _Fp> |
| 2232 | constexpr auto |
| 2233 | operator() [[nodiscard]] (_Range&& __r, _Fp&& __f) const |
| 2234 | { |
| 2235 | return transform_view(std::forward<_Range>(__r), std::forward<_Fp>(__f)); |
| 2236 | } |
| 2237 | |
| 2238 | using _RangeAdaptor<_Transform>::operator(); |
| 2239 | static constexpr int _S_arity = 2; |
| 2240 | static constexpr bool _S_has_simple_extra_args = true; |
| 2241 | }; |
| 2242 | |
| 2243 | inline constexpr _Transform transform; |
| 2244 | } // namespace views |
| 2245 | |
| 2246 | template<view _Vp> |
| 2247 | class take_view : public view_interface<take_view<_Vp>> |
| 2248 | { |
| 2249 | private: |
| 2250 | template<bool _Const> |
| 2251 | using _CI = counted_iterator< |
| 2252 | iterator_t<__detail::__maybe_const_t<_Const, _Vp>>>; |
| 2253 | |
| 2254 | template<bool _Const> |
| 2255 | struct _Sentinel |
| 2256 | { |
| 2257 | private: |
| 2258 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 2259 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 2260 | |
| 2261 | public: |
| 2262 | _Sentinel() = default; |
| 2263 | |
| 2264 | constexpr explicit |
| 2265 | _Sentinel(sentinel_t<_Base> __end) |
| 2266 | : _M_end(__end) |
| 2267 | { } |
| 2268 | |
| 2269 | constexpr |
| 2270 | _Sentinel(_Sentinel<!_Const> __s) |
| 2271 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 2272 | : _M_end(std::move(__s._M_end)) |
| 2273 | { } |
| 2274 | |
| 2275 | constexpr sentinel_t<_Base> |
| 2276 | base() const |
| 2277 | { return _M_end; } |
| 2278 | |
| 2279 | friend constexpr bool |
| 2280 | operator==(const _CI<_Const>& __y, const _Sentinel& __x) |
| 2281 | { return __y.count() == 0 || __y.base() == __x._M_end; } |
| 2282 | |
| 2283 | template<bool _OtherConst = !_Const, |
| 2284 | typename _Base2 = __detail::__maybe_const_t<_OtherConst, _Vp>> |
| 2285 | requires sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 2286 | friend constexpr bool |
| 2287 | operator==(const _CI<_OtherConst>& __y, const _Sentinel& __x) |
| 2288 | { return __y.count() == 0 || __y.base() == __x._M_end; } |
| 2289 | |
| 2290 | friend _Sentinel<!_Const>; |
| 2291 | }; |
| 2292 | |
| 2293 | _Vp _M_base = _Vp(); |
| 2294 | range_difference_t<_Vp> _M_count = 0; |
| 2295 | |
| 2296 | public: |
| 2297 | take_view() requires default_initializable<_Vp> = default; |
| 2298 | |
| 2299 | constexpr |
| 2300 | take_view(_Vp __base, range_difference_t<_Vp> __count) |
| 2301 | : _M_base(std::move(__base)), _M_count(std::move(__count)) |
| 2302 | { } |
| 2303 | |
| 2304 | constexpr _Vp |
| 2305 | base() const& requires copy_constructible<_Vp> |
| 2306 | { return _M_base; } |
| 2307 | |
| 2308 | constexpr _Vp |
| 2309 | base() && |
| 2310 | { return std::move(_M_base); } |
| 2311 | |
| 2312 | constexpr auto |
| 2313 | begin() requires (!__detail::__simple_view<_Vp>) |
| 2314 | { |
| 2315 | if constexpr (sized_range<_Vp>) |
| 2316 | { |
| 2317 | if constexpr (random_access_range<_Vp>) |
| 2318 | return ranges::begin(_M_base); |
| 2319 | else |
| 2320 | { |
| 2321 | auto __sz = size(); |
| 2322 | return counted_iterator(ranges::begin(_M_base), __sz); |
| 2323 | } |
| 2324 | } |
| 2325 | else |
| 2326 | return counted_iterator(ranges::begin(_M_base), _M_count); |
| 2327 | } |
| 2328 | |
| 2329 | constexpr auto |
| 2330 | begin() const requires range<const _Vp> |
| 2331 | { |
| 2332 | if constexpr (sized_range<const _Vp>) |
| 2333 | { |
| 2334 | if constexpr (random_access_range<const _Vp>) |
| 2335 | return ranges::begin(_M_base); |
| 2336 | else |
| 2337 | { |
| 2338 | auto __sz = size(); |
| 2339 | return counted_iterator(ranges::begin(_M_base), __sz); |
| 2340 | } |
| 2341 | } |
| 2342 | else |
| 2343 | return counted_iterator(ranges::begin(_M_base), _M_count); |
| 2344 | } |
| 2345 | |
| 2346 | constexpr auto |
| 2347 | end() requires (!__detail::__simple_view<_Vp>) |
| 2348 | { |
| 2349 | if constexpr (sized_range<_Vp>) |
| 2350 | { |
| 2351 | if constexpr (random_access_range<_Vp>) |
| 2352 | return ranges::begin(_M_base) + size(); |
| 2353 | else |
| 2354 | return default_sentinel; |
| 2355 | } |
| 2356 | else |
| 2357 | return _Sentinel<false>{ranges::end(_M_base)}; |
| 2358 | } |
| 2359 | |
| 2360 | constexpr auto |
| 2361 | end() const requires range<const _Vp> |
| 2362 | { |
| 2363 | if constexpr (sized_range<const _Vp>) |
| 2364 | { |
| 2365 | if constexpr (random_access_range<const _Vp>) |
| 2366 | return ranges::begin(_M_base) + size(); |
| 2367 | else |
| 2368 | return default_sentinel; |
| 2369 | } |
| 2370 | else |
| 2371 | return _Sentinel<true>{ranges::end(_M_base)}; |
| 2372 | } |
| 2373 | |
| 2374 | constexpr auto |
| 2375 | size() requires sized_range<_Vp> |
| 2376 | { |
| 2377 | auto __n = ranges::size(_M_base); |
| 2378 | return std::min(__n, static_cast<decltype(__n)>(_M_count)); |
| 2379 | } |
| 2380 | |
| 2381 | constexpr auto |
| 2382 | size() const requires sized_range<const _Vp> |
| 2383 | { |
| 2384 | auto __n = ranges::size(_M_base); |
| 2385 | return std::min(__n, static_cast<decltype(__n)>(_M_count)); |
| 2386 | } |
| 2387 | }; |
| 2388 | |
| 2389 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2390 | // 3447. Deduction guides for take_view and drop_view have different |
| 2391 | // constraints |
| 2392 | template<typename _Range> |
| 2393 | take_view(_Range&&, range_difference_t<_Range>) |
| 2394 | -> take_view<views::all_t<_Range>>; |
| 2395 | |
| 2396 | template<typename _Tp> |
| 2397 | inline constexpr bool enable_borrowed_range<take_view<_Tp>> |
| 2398 | = enable_borrowed_range<_Tp>; |
| 2399 | |
| 2400 | namespace views |
| 2401 | { |
| 2402 | namespace __detail |
| 2403 | { |
| 2404 | template<typename _Range> |
| 2405 | inline constexpr bool __is_empty_view = false; |
| 2406 | |
| 2407 | template<typename _Tp> |
| 2408 | inline constexpr bool __is_empty_view<empty_view<_Tp>> = true; |
| 2409 | |
| 2410 | template<typename _Range> |
| 2411 | inline constexpr bool __is_basic_string_view = false; |
| 2412 | |
| 2413 | template<typename _CharT, typename _Traits> |
| 2414 | inline constexpr bool __is_basic_string_view<basic_string_view<_CharT, _Traits>> |
| 2415 | = true; |
| 2416 | |
| 2417 | using ranges::__detail::__is_subrange; |
| 2418 | |
| 2419 | template<typename _Range> |
| 2420 | inline constexpr bool __is_iota_view = false; |
| 2421 | |
| 2422 | template<typename _Winc, typename _Bound> |
| 2423 | inline constexpr bool __is_iota_view<iota_view<_Winc, _Bound>> = true; |
| 2424 | |
| 2425 | template<typename _Range> |
| 2426 | inline constexpr bool __is_repeat_view = false; |
| 2427 | |
| 2428 | template<typename _Range> |
| 2429 | constexpr auto |
| 2430 | __take_of_repeat_view(_Range&&, range_difference_t<_Range>); // defined later |
| 2431 | |
| 2432 | template<typename _Range, typename _Dp> |
| 2433 | concept __can_take_view |
| 2434 | = requires { take_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 2435 | } // namespace __detail |
| 2436 | |
| 2437 | struct _Take : __adaptor::_RangeAdaptor<_Take> |
| 2438 | { |
| 2439 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 2440 | requires __detail::__can_take_view<_Range, _Dp> |
| 2441 | constexpr auto |
| 2442 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 2443 | { |
| 2444 | using _Tp = remove_cvref_t<_Range>; |
| 2445 | if constexpr (__detail::__is_empty_view<_Tp>) |
| 2446 | return _Tp(); |
| 2447 | else if constexpr (random_access_range<_Tp> |
| 2448 | && sized_range<_Tp> |
| 2449 | && (std::__detail::__is_span<_Tp> |
| 2450 | || __detail::__is_basic_string_view<_Tp> |
| 2451 | || __detail::__is_subrange<_Tp> |
| 2452 | || __detail::__is_iota_view<_Tp>)) |
| 2453 | { |
| 2454 | __n = std::min<_Dp>(ranges::distance(__r), __n); |
| 2455 | auto __begin = ranges::begin(__r); |
| 2456 | auto __end = __begin + __n; |
| 2457 | if constexpr (std::__detail::__is_span<_Tp>) |
| 2458 | return span<typename _Tp::element_type>(__begin, __end); |
| 2459 | else if constexpr (__detail::__is_basic_string_view<_Tp>) |
| 2460 | return _Tp(__begin, __end); |
| 2461 | else if constexpr (__detail::__is_subrange<_Tp>) |
| 2462 | return subrange<iterator_t<_Tp>>(__begin, __end); |
| 2463 | else |
| 2464 | return iota_view(*__begin, *__end); |
| 2465 | } |
| 2466 | else if constexpr (__detail::__is_repeat_view<_Tp>) |
| 2467 | return __detail::__take_of_repeat_view(std::forward<_Range>(__r), __n); |
| 2468 | else |
| 2469 | return take_view(std::forward<_Range>(__r), __n); |
| 2470 | } |
| 2471 | |
| 2472 | using _RangeAdaptor<_Take>::operator(); |
| 2473 | static constexpr int _S_arity = 2; |
| 2474 | // The count argument of views::take is not always simple -- it can be |
| 2475 | // e.g. a move-only class that's implicitly convertible to the difference |
| 2476 | // type. But an integer-like count argument is surely simple. |
| 2477 | template<typename _Tp> |
| 2478 | static constexpr bool _S_has_simple_extra_args |
| 2479 | = ranges::__detail::__is_integer_like<_Tp>; |
| 2480 | }; |
| 2481 | |
| 2482 | inline constexpr _Take take; |
| 2483 | } // namespace views |
| 2484 | |
| 2485 | template<view _Vp, typename _Pred> |
| 2486 | requires input_range<_Vp> && is_object_v<_Pred> |
| 2487 | && indirect_unary_predicate<const _Pred, iterator_t<_Vp>> |
| 2488 | class take_while_view : public view_interface<take_while_view<_Vp, _Pred>> |
| 2489 | { |
| 2490 | template<bool _Const> |
| 2491 | struct _Sentinel |
| 2492 | { |
| 2493 | private: |
| 2494 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 2495 | |
| 2496 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 2497 | const _Pred* _M_pred = nullptr; |
| 2498 | |
| 2499 | public: |
| 2500 | _Sentinel() = default; |
| 2501 | |
| 2502 | constexpr explicit |
| 2503 | _Sentinel(sentinel_t<_Base> __end, const _Pred* __pred) |
| 2504 | : _M_end(__end), _M_pred(__pred) |
| 2505 | { } |
| 2506 | |
| 2507 | constexpr |
| 2508 | _Sentinel(_Sentinel<!_Const> __s) |
| 2509 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 2510 | : _M_end(__s._M_end), _M_pred(__s._M_pred) |
| 2511 | { } |
| 2512 | |
| 2513 | constexpr sentinel_t<_Base> |
| 2514 | base() const { return _M_end; } |
| 2515 | |
| 2516 | friend constexpr bool |
| 2517 | operator==(const iterator_t<_Base>& __x, const _Sentinel& __y) |
| 2518 | { return __y._M_end == __x || !std::__invoke(*__y._M_pred, *__x); } |
| 2519 | |
| 2520 | template<bool _OtherConst = !_Const, |
| 2521 | typename _Base2 = __detail::__maybe_const_t<_OtherConst, _Vp>> |
| 2522 | requires sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 2523 | friend constexpr bool |
| 2524 | operator==(const iterator_t<_Base2>& __x, const _Sentinel& __y) |
| 2525 | { return __y._M_end == __x || !std::__invoke(*__y._M_pred, *__x); } |
| 2526 | |
| 2527 | friend _Sentinel<!_Const>; |
| 2528 | }; |
| 2529 | |
| 2530 | _Vp _M_base = _Vp(); |
| 2531 | [[no_unique_address]] __detail::__box<_Pred> _M_pred; |
| 2532 | |
| 2533 | public: |
| 2534 | take_while_view() requires (default_initializable<_Vp> |
| 2535 | && default_initializable<_Pred>) |
| 2536 | = default; |
| 2537 | |
| 2538 | constexpr |
| 2539 | take_while_view(_Vp __base, _Pred __pred) |
| 2540 | : _M_base(std::move(__base)), _M_pred(std::move(__pred)) |
| 2541 | { } |
| 2542 | |
| 2543 | constexpr _Vp |
| 2544 | base() const& requires copy_constructible<_Vp> |
| 2545 | { return _M_base; } |
| 2546 | |
| 2547 | constexpr _Vp |
| 2548 | base() && |
| 2549 | { return std::move(_M_base); } |
| 2550 | |
| 2551 | constexpr const _Pred& |
| 2552 | pred() const |
| 2553 | { return *_M_pred; } |
| 2554 | |
| 2555 | constexpr auto |
| 2556 | begin() requires (!__detail::__simple_view<_Vp>) |
| 2557 | { return ranges::begin(_M_base); } |
| 2558 | |
| 2559 | constexpr auto |
| 2560 | begin() const requires range<const _Vp> |
| 2561 | && indirect_unary_predicate<const _Pred, iterator_t<const _Vp>> |
| 2562 | { return ranges::begin(_M_base); } |
| 2563 | |
| 2564 | constexpr auto |
| 2565 | end() requires (!__detail::__simple_view<_Vp>) |
| 2566 | { return _Sentinel<false>(ranges::end(_M_base), |
| 2567 | std::__addressof(*_M_pred)); } |
| 2568 | |
| 2569 | constexpr auto |
| 2570 | end() const requires range<const _Vp> |
| 2571 | && indirect_unary_predicate<const _Pred, iterator_t<const _Vp>> |
| 2572 | { return _Sentinel<true>(ranges::end(_M_base), |
| 2573 | std::__addressof(*_M_pred)); } |
| 2574 | }; |
| 2575 | |
| 2576 | template<typename _Range, typename _Pred> |
| 2577 | take_while_view(_Range&&, _Pred) |
| 2578 | -> take_while_view<views::all_t<_Range>, _Pred>; |
| 2579 | |
| 2580 | namespace views |
| 2581 | { |
| 2582 | namespace __detail |
| 2583 | { |
| 2584 | template<typename _Range, typename _Pred> |
| 2585 | concept __can_take_while_view |
| 2586 | = requires { take_while_view(std::declval<_Range>(), std::declval<_Pred>()); }; |
| 2587 | } // namespace __detail |
| 2588 | |
| 2589 | struct _TakeWhile : __adaptor::_RangeAdaptor<_TakeWhile> |
| 2590 | { |
| 2591 | template<viewable_range _Range, typename _Pred> |
| 2592 | requires __detail::__can_take_while_view<_Range, _Pred> |
| 2593 | constexpr auto |
| 2594 | operator() [[nodiscard]] (_Range&& __r, _Pred&& __p) const |
| 2595 | { |
| 2596 | return take_while_view(std::forward<_Range>(__r), std::forward<_Pred>(__p)); |
| 2597 | } |
| 2598 | |
| 2599 | using _RangeAdaptor<_TakeWhile>::operator(); |
| 2600 | static constexpr int _S_arity = 2; |
| 2601 | static constexpr bool _S_has_simple_extra_args = true; |
| 2602 | }; |
| 2603 | |
| 2604 | inline constexpr _TakeWhile take_while; |
| 2605 | } // namespace views |
| 2606 | |
| 2607 | template<view _Vp> |
| 2608 | class drop_view : public view_interface<drop_view<_Vp>> |
| 2609 | { |
| 2610 | private: |
| 2611 | _Vp _M_base = _Vp(); |
| 2612 | range_difference_t<_Vp> _M_count = 0; |
| 2613 | |
| 2614 | // ranges::next(begin(base), count, end(base)) is O(1) if _Vp satisfies |
| 2615 | // both random_access_range and sized_range. Otherwise, cache its result. |
| 2616 | static constexpr bool _S_needs_cached_begin |
| 2617 | = !(random_access_range<const _Vp> && sized_range<const _Vp>); |
| 2618 | [[no_unique_address]] |
| 2619 | __detail::__maybe_present_t<_S_needs_cached_begin, |
| 2620 | __detail::_CachedPosition<_Vp>> |
| 2621 | _M_cached_begin; |
| 2622 | |
| 2623 | public: |
| 2624 | drop_view() requires default_initializable<_Vp> = default; |
| 2625 | |
| 2626 | constexpr |
| 2627 | drop_view(_Vp __base, range_difference_t<_Vp> __count) |
| 2628 | : _M_base(std::move(__base)), _M_count(__count) |
| 2629 | { __glibcxx_assert(__count >= 0); } |
| 2630 | |
| 2631 | constexpr _Vp |
| 2632 | base() const& requires copy_constructible<_Vp> |
| 2633 | { return _M_base; } |
| 2634 | |
| 2635 | constexpr _Vp |
| 2636 | base() && |
| 2637 | { return std::move(_M_base); } |
| 2638 | |
| 2639 | // This overload is disabled for simple views with constant-time begin(). |
| 2640 | constexpr auto |
| 2641 | begin() |
| 2642 | requires (!(__detail::__simple_view<_Vp> |
| 2643 | && random_access_range<const _Vp> |
| 2644 | && sized_range<const _Vp>)) |
| 2645 | { |
| 2646 | if constexpr (_S_needs_cached_begin) |
| 2647 | if (_M_cached_begin._M_has_value()) |
| 2648 | return _M_cached_begin._M_get(_M_base); |
| 2649 | |
| 2650 | auto __it = ranges::next(ranges::begin(_M_base), |
| 2651 | _M_count, ranges::end(_M_base)); |
| 2652 | if constexpr (_S_needs_cached_begin) |
| 2653 | _M_cached_begin._M_set(_M_base, __it); |
| 2654 | return __it; |
| 2655 | } |
| 2656 | |
| 2657 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2658 | // 3482. drop_view's const begin should additionally require sized_range |
| 2659 | constexpr auto |
| 2660 | begin() const |
| 2661 | requires random_access_range<const _Vp> && sized_range<const _Vp> |
| 2662 | { |
| 2663 | return ranges::begin(_M_base) + ranges::min(ranges::distance(_M_base), |
| 2664 | _M_count); |
| 2665 | } |
| 2666 | |
| 2667 | constexpr auto |
| 2668 | end() requires (!__detail::__simple_view<_Vp>) |
| 2669 | { return ranges::end(_M_base); } |
| 2670 | |
| 2671 | constexpr auto |
| 2672 | end() const requires range<const _Vp> |
| 2673 | { return ranges::end(_M_base); } |
| 2674 | |
| 2675 | constexpr auto |
| 2676 | size() requires sized_range<_Vp> |
| 2677 | { |
| 2678 | const auto __s = ranges::size(_M_base); |
| 2679 | const auto __c = static_cast<decltype(__s)>(_M_count); |
| 2680 | return __s < __c ? 0 : __s - __c; |
| 2681 | } |
| 2682 | |
| 2683 | constexpr auto |
| 2684 | size() const requires sized_range<const _Vp> |
| 2685 | { |
| 2686 | const auto __s = ranges::size(_M_base); |
| 2687 | const auto __c = static_cast<decltype(__s)>(_M_count); |
| 2688 | return __s < __c ? 0 : __s - __c; |
| 2689 | } |
| 2690 | }; |
| 2691 | |
| 2692 | template<typename _Range> |
| 2693 | drop_view(_Range&&, range_difference_t<_Range>) |
| 2694 | -> drop_view<views::all_t<_Range>>; |
| 2695 | |
| 2696 | template<typename _Tp> |
| 2697 | inline constexpr bool enable_borrowed_range<drop_view<_Tp>> |
| 2698 | = enable_borrowed_range<_Tp>; |
| 2699 | |
| 2700 | namespace views |
| 2701 | { |
| 2702 | namespace __detail |
| 2703 | { |
| 2704 | template<typename _Range> |
| 2705 | constexpr auto |
| 2706 | __drop_of_repeat_view(_Range&&, range_difference_t<_Range>); // defined later |
| 2707 | |
| 2708 | template<typename _Range, typename _Dp> |
| 2709 | concept __can_drop_view |
| 2710 | = requires { drop_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 2711 | } // namespace __detail |
| 2712 | |
| 2713 | struct _Drop : __adaptor::_RangeAdaptor<_Drop> |
| 2714 | { |
| 2715 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 2716 | requires __detail::__can_drop_view<_Range, _Dp> |
| 2717 | constexpr auto |
| 2718 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 2719 | { |
| 2720 | using _Tp = remove_cvref_t<_Range>; |
| 2721 | if constexpr (__detail::__is_empty_view<_Tp>) |
| 2722 | return _Tp(); |
| 2723 | else if constexpr (random_access_range<_Tp> |
| 2724 | && sized_range<_Tp> |
| 2725 | && (std::__detail::__is_span<_Tp> |
| 2726 | || __detail::__is_basic_string_view<_Tp> |
| 2727 | || __detail::__is_iota_view<_Tp> |
| 2728 | || __detail::__is_subrange<_Tp>)) |
| 2729 | { |
| 2730 | __n = std::min<_Dp>(ranges::distance(__r), __n); |
| 2731 | auto __begin = ranges::begin(__r) + __n; |
| 2732 | auto __end = ranges::end(__r); |
| 2733 | if constexpr (std::__detail::__is_span<_Tp>) |
| 2734 | return span<typename _Tp::element_type>(__begin, __end); |
| 2735 | else if constexpr (__detail::__is_subrange<_Tp>) |
| 2736 | { |
| 2737 | if constexpr (_Tp::_S_store_size) |
| 2738 | { |
| 2739 | using ranges::__detail::__to_unsigned_like; |
| 2740 | auto __m = ranges::distance(__r) - __n; |
| 2741 | return _Tp(__begin, __end, __to_unsigned_like(__m)); |
| 2742 | } |
| 2743 | else |
| 2744 | return _Tp(__begin, __end); |
| 2745 | } |
| 2746 | else |
| 2747 | return _Tp(__begin, __end); |
| 2748 | } |
| 2749 | else if constexpr (__detail::__is_repeat_view<_Tp>) |
| 2750 | return __detail::__drop_of_repeat_view(std::forward<_Range>(__r), __n); |
| 2751 | else |
| 2752 | return drop_view(std::forward<_Range>(__r), __n); |
| 2753 | } |
| 2754 | |
| 2755 | using _RangeAdaptor<_Drop>::operator(); |
| 2756 | static constexpr int _S_arity = 2; |
| 2757 | template<typename _Tp> |
| 2758 | static constexpr bool _S_has_simple_extra_args |
| 2759 | = _Take::_S_has_simple_extra_args<_Tp>; |
| 2760 | }; |
| 2761 | |
| 2762 | inline constexpr _Drop drop; |
| 2763 | } // namespace views |
| 2764 | |
| 2765 | template<view _Vp, typename _Pred> |
| 2766 | requires input_range<_Vp> && is_object_v<_Pred> |
| 2767 | && indirect_unary_predicate<const _Pred, iterator_t<_Vp>> |
| 2768 | class drop_while_view : public view_interface<drop_while_view<_Vp, _Pred>> |
| 2769 | { |
| 2770 | private: |
| 2771 | _Vp _M_base = _Vp(); |
| 2772 | [[no_unique_address]] __detail::__box<_Pred> _M_pred; |
| 2773 | [[no_unique_address]] __detail::_CachedPosition<_Vp> _M_cached_begin; |
| 2774 | |
| 2775 | public: |
| 2776 | drop_while_view() requires (default_initializable<_Vp> |
| 2777 | && default_initializable<_Pred>) |
| 2778 | = default; |
| 2779 | |
| 2780 | constexpr |
| 2781 | drop_while_view(_Vp __base, _Pred __pred) |
| 2782 | : _M_base(std::move(__base)), _M_pred(std::move(__pred)) |
| 2783 | { } |
| 2784 | |
| 2785 | constexpr _Vp |
| 2786 | base() const& requires copy_constructible<_Vp> |
| 2787 | { return _M_base; } |
| 2788 | |
| 2789 | constexpr _Vp |
| 2790 | base() && |
| 2791 | { return std::move(_M_base); } |
| 2792 | |
| 2793 | constexpr const _Pred& |
| 2794 | pred() const |
| 2795 | { return *_M_pred; } |
| 2796 | |
| 2797 | constexpr auto |
| 2798 | begin() |
| 2799 | { |
| 2800 | if (_M_cached_begin._M_has_value()) |
| 2801 | return _M_cached_begin._M_get(_M_base); |
| 2802 | |
| 2803 | __glibcxx_assert(_M_pred.has_value()); |
| 2804 | auto __it = ranges::find_if_not(ranges::begin(_M_base), |
| 2805 | ranges::end(_M_base), |
| 2806 | std::cref(*_M_pred)); |
| 2807 | _M_cached_begin._M_set(_M_base, __it); |
| 2808 | return __it; |
| 2809 | } |
| 2810 | |
| 2811 | constexpr auto |
| 2812 | end() |
| 2813 | { return ranges::end(_M_base); } |
| 2814 | }; |
| 2815 | |
| 2816 | template<typename _Range, typename _Pred> |
| 2817 | drop_while_view(_Range&&, _Pred) |
| 2818 | -> drop_while_view<views::all_t<_Range>, _Pred>; |
| 2819 | |
| 2820 | template<typename _Tp, typename _Pred> |
| 2821 | inline constexpr bool enable_borrowed_range<drop_while_view<_Tp, _Pred>> |
| 2822 | = enable_borrowed_range<_Tp>; |
| 2823 | |
| 2824 | namespace views |
| 2825 | { |
| 2826 | namespace __detail |
| 2827 | { |
| 2828 | template<typename _Range, typename _Pred> |
| 2829 | concept __can_drop_while_view |
| 2830 | = requires { drop_while_view(std::declval<_Range>(), std::declval<_Pred>()); }; |
| 2831 | } // namespace __detail |
| 2832 | |
| 2833 | struct _DropWhile : __adaptor::_RangeAdaptor<_DropWhile> |
| 2834 | { |
| 2835 | template<viewable_range _Range, typename _Pred> |
| 2836 | requires __detail::__can_drop_while_view<_Range, _Pred> |
| 2837 | constexpr auto |
| 2838 | operator() [[nodiscard]] (_Range&& __r, _Pred&& __p) const |
| 2839 | { |
| 2840 | return drop_while_view(std::forward<_Range>(__r), |
| 2841 | std::forward<_Pred>(__p)); |
| 2842 | } |
| 2843 | |
| 2844 | using _RangeAdaptor<_DropWhile>::operator(); |
| 2845 | static constexpr int _S_arity = 2; |
| 2846 | static constexpr bool _S_has_simple_extra_args = true; |
| 2847 | }; |
| 2848 | |
| 2849 | inline constexpr _DropWhile drop_while; |
| 2850 | } // namespace views |
| 2851 | |
| 2852 | namespace __detail |
| 2853 | { |
| 2854 | template<typename _Tp> |
| 2855 | constexpr _Tp& |
| 2856 | __as_lvalue(_Tp&& __t) |
| 2857 | { return static_cast<_Tp&>(__t); } |
| 2858 | } // namespace __detail |
| 2859 | |
| 2860 | template<input_range _Vp> |
| 2861 | requires view<_Vp> && input_range<range_reference_t<_Vp>> |
| 2862 | class join_view : public view_interface<join_view<_Vp>> |
| 2863 | { |
| 2864 | private: |
| 2865 | using _InnerRange = range_reference_t<_Vp>; |
| 2866 | |
| 2867 | template<bool _Const> |
| 2868 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 2869 | |
| 2870 | template<bool _Const> |
| 2871 | using _Outer_iter = iterator_t<_Base<_Const>>; |
| 2872 | |
| 2873 | template<bool _Const> |
| 2874 | using _Inner_iter = iterator_t<range_reference_t<_Base<_Const>>>; |
| 2875 | |
| 2876 | template<bool _Const> |
| 2877 | static constexpr bool _S_ref_is_glvalue |
| 2878 | = is_reference_v<range_reference_t<_Base<_Const>>>; |
| 2879 | |
| 2880 | template<bool _Const> |
| 2881 | struct __iter_cat |
| 2882 | { }; |
| 2883 | |
| 2884 | template<bool _Const> |
| 2885 | requires _S_ref_is_glvalue<_Const> |
| 2886 | && forward_range<_Base<_Const>> |
| 2887 | && forward_range<range_reference_t<_Base<_Const>>> |
| 2888 | struct __iter_cat<_Const> |
| 2889 | { |
| 2890 | private: |
| 2891 | static constexpr auto |
| 2892 | _S_iter_cat() |
| 2893 | { |
| 2894 | using _Outer_iter = join_view::_Outer_iter<_Const>; |
| 2895 | using _Inner_iter = join_view::_Inner_iter<_Const>; |
| 2896 | using _OuterCat = typename iterator_traits<_Outer_iter>::iterator_category; |
| 2897 | using _InnerCat = typename iterator_traits<_Inner_iter>::iterator_category; |
| 2898 | if constexpr (derived_from<_OuterCat, bidirectional_iterator_tag> |
| 2899 | && derived_from<_InnerCat, bidirectional_iterator_tag> |
| 2900 | && common_range<range_reference_t<_Base<_Const>>>) |
| 2901 | return bidirectional_iterator_tag{}; |
| 2902 | else if constexpr (derived_from<_OuterCat, forward_iterator_tag> |
| 2903 | && derived_from<_InnerCat, forward_iterator_tag>) |
| 2904 | return forward_iterator_tag{}; |
| 2905 | else |
| 2906 | return input_iterator_tag{}; |
| 2907 | } |
| 2908 | public: |
| 2909 | using iterator_category = decltype(_S_iter_cat()); |
| 2910 | }; |
| 2911 | |
| 2912 | template<bool _Const> |
| 2913 | struct _Sentinel; |
| 2914 | |
| 2915 | template<bool _Const> |
| 2916 | struct _Iterator : __iter_cat<_Const> |
| 2917 | { |
| 2918 | private: |
| 2919 | using _Parent = __detail::__maybe_const_t<_Const, join_view>; |
| 2920 | using _Base = join_view::_Base<_Const>; |
| 2921 | |
| 2922 | friend join_view; |
| 2923 | |
| 2924 | static constexpr bool _S_ref_is_glvalue |
| 2925 | = join_view::_S_ref_is_glvalue<_Const>; |
| 2926 | |
| 2927 | constexpr void |
| 2928 | _M_satisfy() |
| 2929 | { |
| 2930 | auto __update_inner = [this] (const iterator_t<_Base>& __x) -> auto&& { |
| 2931 | if constexpr (_S_ref_is_glvalue) |
| 2932 | return *__x; |
| 2933 | else |
| 2934 | return _M_parent->_M_inner._M_emplace_deref(__x); |
| 2935 | }; |
| 2936 | |
| 2937 | _Outer_iter& __outer = _M_get_outer(); |
| 2938 | for (; __outer != ranges::end(_M_parent->_M_base); ++__outer) |
| 2939 | { |
| 2940 | auto&& __inner = __update_inner(__outer); |
| 2941 | _M_inner = ranges::begin(__inner); |
| 2942 | if (_M_inner != ranges::end(__inner)) |
| 2943 | return; |
| 2944 | } |
| 2945 | |
| 2946 | if constexpr (_S_ref_is_glvalue) |
| 2947 | _M_inner.reset(); |
| 2948 | } |
| 2949 | |
| 2950 | static constexpr auto |
| 2951 | _S_iter_concept() |
| 2952 | { |
| 2953 | if constexpr (_S_ref_is_glvalue |
| 2954 | && bidirectional_range<_Base> |
| 2955 | && bidirectional_range<range_reference_t<_Base>> |
| 2956 | && common_range<range_reference_t<_Base>>) |
| 2957 | return bidirectional_iterator_tag{}; |
| 2958 | else if constexpr (_S_ref_is_glvalue |
| 2959 | && forward_range<_Base> |
| 2960 | && forward_range<range_reference_t<_Base>>) |
| 2961 | return forward_iterator_tag{}; |
| 2962 | else |
| 2963 | return input_iterator_tag{}; |
| 2964 | } |
| 2965 | |
| 2966 | using _Outer_iter = join_view::_Outer_iter<_Const>; |
| 2967 | using _Inner_iter = join_view::_Inner_iter<_Const>; |
| 2968 | |
| 2969 | constexpr _Outer_iter& |
| 2970 | _M_get_outer() |
| 2971 | { |
| 2972 | if constexpr (forward_range<_Base>) |
| 2973 | return _M_outer; |
| 2974 | else |
| 2975 | return *_M_parent->_M_outer; |
| 2976 | } |
| 2977 | |
| 2978 | constexpr const _Outer_iter& |
| 2979 | _M_get_outer() const |
| 2980 | { |
| 2981 | if constexpr (forward_range<_Base>) |
| 2982 | return _M_outer; |
| 2983 | else |
| 2984 | return *_M_parent->_M_outer; |
| 2985 | } |
| 2986 | |
| 2987 | constexpr |
| 2988 | _Iterator(_Parent* __parent, _Outer_iter __outer) requires forward_range<_Base> |
| 2989 | : _M_outer(std::move(__outer)), _M_parent(__parent) |
| 2990 | { _M_satisfy(); } |
| 2991 | |
| 2992 | constexpr explicit |
| 2993 | _Iterator(_Parent* __parent) requires (!forward_range<_Base>) |
| 2994 | : _M_parent(__parent) |
| 2995 | { _M_satisfy(); } |
| 2996 | |
| 2997 | [[no_unique_address]] |
| 2998 | __detail::__maybe_present_t<forward_range<_Base>, _Outer_iter> _M_outer; |
| 2999 | optional<_Inner_iter> _M_inner; |
| 3000 | _Parent* _M_parent = nullptr; |
| 3001 | |
| 3002 | public: |
| 3003 | using iterator_concept = decltype(_S_iter_concept()); |
| 3004 | // iterator_category defined in __join_view_iter_cat |
| 3005 | using value_type = range_value_t<range_reference_t<_Base>>; |
| 3006 | using difference_type |
| 3007 | = common_type_t<range_difference_t<_Base>, |
| 3008 | range_difference_t<range_reference_t<_Base>>>; |
| 3009 | |
| 3010 | _Iterator() = default; |
| 3011 | |
| 3012 | constexpr |
| 3013 | _Iterator(_Iterator<!_Const> __i) |
| 3014 | requires _Const |
| 3015 | && convertible_to<iterator_t<_Vp>, _Outer_iter> |
| 3016 | && convertible_to<iterator_t<_InnerRange>, _Inner_iter> |
| 3017 | : _M_outer(std::move(__i._M_outer)), _M_inner(std::move(__i._M_inner)), |
| 3018 | _M_parent(__i._M_parent) |
| 3019 | { } |
| 3020 | |
| 3021 | constexpr decltype(auto) |
| 3022 | operator*() const |
| 3023 | { return **_M_inner; } |
| 3024 | |
| 3025 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3026 | // 3500. join_view::iterator::operator->() is bogus |
| 3027 | constexpr _Inner_iter |
| 3028 | operator->() const |
| 3029 | requires __detail::__has_arrow<_Inner_iter> |
| 3030 | && copyable<_Inner_iter> |
| 3031 | { return *_M_inner; } |
| 3032 | |
| 3033 | constexpr _Iterator& |
| 3034 | operator++() |
| 3035 | { |
| 3036 | auto&& __inner_range = [this] () -> auto&& { |
| 3037 | if constexpr (_S_ref_is_glvalue) |
| 3038 | return *_M_get_outer(); |
| 3039 | else |
| 3040 | return *_M_parent->_M_inner; |
| 3041 | }(); |
| 3042 | if (++*_M_inner == ranges::end(__inner_range)) |
| 3043 | { |
| 3044 | ++_M_get_outer(); |
| 3045 | _M_satisfy(); |
| 3046 | } |
| 3047 | return *this; |
| 3048 | } |
| 3049 | |
| 3050 | constexpr void |
| 3051 | operator++(int) |
| 3052 | { ++*this; } |
| 3053 | |
| 3054 | constexpr _Iterator |
| 3055 | operator++(int) |
| 3056 | requires _S_ref_is_glvalue && forward_range<_Base> |
| 3057 | && forward_range<range_reference_t<_Base>> |
| 3058 | { |
| 3059 | auto __tmp = *this; |
| 3060 | ++*this; |
| 3061 | return __tmp; |
| 3062 | } |
| 3063 | |
| 3064 | constexpr _Iterator& |
| 3065 | operator--() |
| 3066 | requires _S_ref_is_glvalue && bidirectional_range<_Base> |
| 3067 | && bidirectional_range<range_reference_t<_Base>> |
| 3068 | && common_range<range_reference_t<_Base>> |
| 3069 | { |
| 3070 | if (_M_outer == ranges::end(_M_parent->_M_base)) |
| 3071 | _M_inner = ranges::end(__detail::__as_lvalue(*--_M_outer)); |
| 3072 | while (*_M_inner == ranges::begin(__detail::__as_lvalue(*_M_outer))) |
| 3073 | *_M_inner = ranges::end(__detail::__as_lvalue(*--_M_outer)); |
| 3074 | --*_M_inner; |
| 3075 | return *this; |
| 3076 | } |
| 3077 | |
| 3078 | constexpr _Iterator |
| 3079 | operator--(int) |
| 3080 | requires _S_ref_is_glvalue && bidirectional_range<_Base> |
| 3081 | && bidirectional_range<range_reference_t<_Base>> |
| 3082 | && common_range<range_reference_t<_Base>> |
| 3083 | { |
| 3084 | auto __tmp = *this; |
| 3085 | --*this; |
| 3086 | return __tmp; |
| 3087 | } |
| 3088 | |
| 3089 | friend constexpr bool |
| 3090 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 3091 | requires _S_ref_is_glvalue |
| 3092 | && forward_range<_Base> |
| 3093 | && equality_comparable<_Inner_iter> |
| 3094 | { |
| 3095 | return (__x._M_outer == __y._M_outer |
| 3096 | && __x._M_inner == __y._M_inner); |
| 3097 | } |
| 3098 | |
| 3099 | friend constexpr decltype(auto) |
| 3100 | iter_move(const _Iterator& __i) |
| 3101 | noexcept(noexcept(ranges::iter_move(*__i._M_inner))) |
| 3102 | { return ranges::iter_move(*__i._M_inner); } |
| 3103 | |
| 3104 | friend constexpr void |
| 3105 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 3106 | noexcept(noexcept(ranges::iter_swap(*__x._M_inner, *__y._M_inner))) |
| 3107 | requires indirectly_swappable<_Inner_iter> |
| 3108 | { return ranges::iter_swap(*__x._M_inner, *__y._M_inner); } |
| 3109 | |
| 3110 | friend _Iterator<!_Const>; |
| 3111 | template<bool> friend struct _Sentinel; |
| 3112 | }; |
| 3113 | |
| 3114 | template<bool _Const> |
| 3115 | struct _Sentinel |
| 3116 | { |
| 3117 | private: |
| 3118 | using _Parent = __detail::__maybe_const_t<_Const, join_view>; |
| 3119 | using _Base = join_view::_Base<_Const>; |
| 3120 | |
| 3121 | template<bool _Const2> |
| 3122 | constexpr bool |
| 3123 | __equal(const _Iterator<_Const2>& __i) const |
| 3124 | { return __i._M_get_outer() == _M_end; } |
| 3125 | |
| 3126 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 3127 | |
| 3128 | public: |
| 3129 | _Sentinel() = default; |
| 3130 | |
| 3131 | constexpr explicit |
| 3132 | _Sentinel(_Parent* __parent) |
| 3133 | : _M_end(ranges::end(__parent->_M_base)) |
| 3134 | { } |
| 3135 | |
| 3136 | constexpr |
| 3137 | _Sentinel(_Sentinel<!_Const> __s) |
| 3138 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 3139 | : _M_end(std::move(__s._M_end)) |
| 3140 | { } |
| 3141 | |
| 3142 | template<bool _Const2> |
| 3143 | requires sentinel_for<sentinel_t<_Base>, |
| 3144 | iterator_t<__detail::__maybe_const_t<_Const2, _Vp>>> |
| 3145 | friend constexpr bool |
| 3146 | operator==(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 3147 | { return __y.__equal(__x); } |
| 3148 | |
| 3149 | friend _Sentinel<!_Const>; |
| 3150 | }; |
| 3151 | |
| 3152 | _Vp _M_base = _Vp(); |
| 3153 | [[no_unique_address]] |
| 3154 | __detail::__maybe_present_t<!forward_range<_Vp>, |
| 3155 | __detail::__non_propagating_cache<iterator_t<_Vp>>> _M_outer; |
| 3156 | [[no_unique_address]] |
| 3157 | __detail::__non_propagating_cache<remove_cv_t<_InnerRange>> _M_inner; |
| 3158 | |
| 3159 | public: |
| 3160 | join_view() requires default_initializable<_Vp> = default; |
| 3161 | |
| 3162 | constexpr explicit |
| 3163 | join_view(_Vp __base) |
| 3164 | : _M_base(std::move(__base)) |
| 3165 | { } |
| 3166 | |
| 3167 | constexpr _Vp |
| 3168 | base() const& requires copy_constructible<_Vp> |
| 3169 | { return _M_base; } |
| 3170 | |
| 3171 | constexpr _Vp |
| 3172 | base() && |
| 3173 | { return std::move(_M_base); } |
| 3174 | |
| 3175 | constexpr auto |
| 3176 | begin() |
| 3177 | { |
| 3178 | if constexpr (forward_range<_Vp>) |
| 3179 | { |
| 3180 | constexpr bool __use_const |
| 3181 | = (__detail::__simple_view<_Vp> |
| 3182 | && is_reference_v<range_reference_t<_Vp>>); |
| 3183 | return _Iterator<__use_const>{this, ranges::begin(_M_base)}; |
| 3184 | } |
| 3185 | else |
| 3186 | { |
| 3187 | _M_outer = ranges::begin(_M_base); |
| 3188 | return _Iterator<false>{this}; |
| 3189 | } |
| 3190 | } |
| 3191 | |
| 3192 | constexpr auto |
| 3193 | begin() const |
| 3194 | requires forward_range<const _Vp> |
| 3195 | && is_reference_v<range_reference_t<const _Vp>> |
| 3196 | && input_range<range_reference_t<const _Vp>> |
| 3197 | { |
| 3198 | return _Iterator<true>{this, ranges::begin(_M_base)}; |
| 3199 | } |
| 3200 | |
| 3201 | constexpr auto |
| 3202 | end() |
| 3203 | { |
| 3204 | if constexpr (forward_range<_Vp> && is_reference_v<_InnerRange> |
| 3205 | && forward_range<_InnerRange> |
| 3206 | && common_range<_Vp> && common_range<_InnerRange>) |
| 3207 | return _Iterator<__detail::__simple_view<_Vp>>{this, |
| 3208 | ranges::end(_M_base)}; |
| 3209 | else |
| 3210 | return _Sentinel<__detail::__simple_view<_Vp>>{this}; |
| 3211 | } |
| 3212 | |
| 3213 | constexpr auto |
| 3214 | end() const |
| 3215 | requires forward_range<const _Vp> |
| 3216 | && is_reference_v<range_reference_t<const _Vp>> |
| 3217 | && input_range<range_reference_t<const _Vp>> |
| 3218 | { |
| 3219 | if constexpr (is_reference_v<range_reference_t<const _Vp>> |
| 3220 | && forward_range<range_reference_t<const _Vp>> |
| 3221 | && common_range<const _Vp> |
| 3222 | && common_range<range_reference_t<const _Vp>>) |
| 3223 | return _Iterator<true>{this, ranges::end(_M_base)}; |
| 3224 | else |
| 3225 | return _Sentinel<true>{this}; |
| 3226 | } |
| 3227 | }; |
| 3228 | |
| 3229 | template<typename _Range> |
| 3230 | explicit join_view(_Range&&) -> join_view<views::all_t<_Range>>; |
| 3231 | |
| 3232 | namespace views |
| 3233 | { |
| 3234 | namespace __detail |
| 3235 | { |
| 3236 | template<typename _Range> |
| 3237 | concept __can_join_view |
| 3238 | = requires { join_view<all_t<_Range>>{std::declval<_Range>()}; }; |
| 3239 | } // namespace __detail |
| 3240 | |
| 3241 | struct _Join : __adaptor::_RangeAdaptorClosure<_Join> |
| 3242 | { |
| 3243 | template<viewable_range _Range> |
| 3244 | requires __detail::__can_join_view<_Range> |
| 3245 | constexpr auto |
| 3246 | operator() [[nodiscard]] (_Range&& __r) const |
| 3247 | { |
| 3248 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3249 | // 3474. Nesting join_views is broken because of CTAD |
| 3250 | return join_view<all_t<_Range>>{std::forward<_Range>(__r)}; |
| 3251 | } |
| 3252 | |
| 3253 | static constexpr bool _S_has_simple_call_op = true; |
| 3254 | }; |
| 3255 | |
| 3256 | inline constexpr _Join join; |
| 3257 | } // namespace views |
| 3258 | |
| 3259 | namespace __detail |
| 3260 | { |
| 3261 | template<auto> |
| 3262 | struct __require_constant; |
| 3263 | |
| 3264 | template<typename _Range> |
| 3265 | concept __tiny_range = sized_range<_Range> |
| 3266 | && requires |
| 3267 | { typename __require_constant<remove_reference_t<_Range>::size()>; } |
| 3268 | && (remove_reference_t<_Range>::size() <= 1); |
| 3269 | |
| 3270 | template<typename _Base> |
| 3271 | struct __lazy_split_view_outer_iter_cat |
| 3272 | { }; |
| 3273 | |
| 3274 | template<forward_range _Base> |
| 3275 | struct __lazy_split_view_outer_iter_cat<_Base> |
| 3276 | { using iterator_category = input_iterator_tag; }; |
| 3277 | |
| 3278 | template<typename _Base> |
| 3279 | struct __lazy_split_view_inner_iter_cat |
| 3280 | { }; |
| 3281 | |
| 3282 | template<forward_range _Base> |
| 3283 | struct __lazy_split_view_inner_iter_cat<_Base> |
| 3284 | { |
| 3285 | private: |
| 3286 | static constexpr auto |
| 3287 | _S_iter_cat() |
| 3288 | { |
| 3289 | using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 3290 | if constexpr (derived_from<_Cat, forward_iterator_tag>) |
| 3291 | return forward_iterator_tag{}; |
| 3292 | else |
| 3293 | return _Cat{}; |
| 3294 | } |
| 3295 | public: |
| 3296 | using iterator_category = decltype(_S_iter_cat()); |
| 3297 | }; |
| 3298 | } |
| 3299 | |
| 3300 | template<input_range _Vp, forward_range _Pattern> |
| 3301 | requires view<_Vp> && view<_Pattern> |
| 3302 | && indirectly_comparable<iterator_t<_Vp>, iterator_t<_Pattern>, |
| 3303 | ranges::equal_to> |
| 3304 | && (forward_range<_Vp> || __detail::__tiny_range<_Pattern>) |
| 3305 | class lazy_split_view : public view_interface<lazy_split_view<_Vp, _Pattern>> |
| 3306 | { |
| 3307 | private: |
| 3308 | template<bool _Const> |
| 3309 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 3310 | |
| 3311 | template<bool _Const> |
| 3312 | struct _InnerIter; |
| 3313 | |
| 3314 | template<bool _Const> |
| 3315 | struct _OuterIter |
| 3316 | : __detail::__lazy_split_view_outer_iter_cat<_Base<_Const>> |
| 3317 | { |
| 3318 | private: |
| 3319 | using _Parent = __detail::__maybe_const_t<_Const, lazy_split_view>; |
| 3320 | using _Base = lazy_split_view::_Base<_Const>; |
| 3321 | |
| 3322 | constexpr bool |
| 3323 | __at_end() const |
| 3324 | { return __current() == ranges::end(_M_parent->_M_base) && !_M_trailing_empty; } |
| 3325 | |
| 3326 | // [range.lazy.split.outer] p1 |
| 3327 | // Many of the following specifications refer to the notional member |
| 3328 | // current of outer-iterator. current is equivalent to current_ if |
| 3329 | // V models forward_range, and parent_->current_ otherwise. |
| 3330 | constexpr auto& |
| 3331 | __current() noexcept |
| 3332 | { |
| 3333 | if constexpr (forward_range<_Vp>) |
| 3334 | return _M_current; |
| 3335 | else |
| 3336 | return *_M_parent->_M_current; |
| 3337 | } |
| 3338 | |
| 3339 | constexpr auto& |
| 3340 | __current() const noexcept |
| 3341 | { |
| 3342 | if constexpr (forward_range<_Vp>) |
| 3343 | return _M_current; |
| 3344 | else |
| 3345 | return *_M_parent->_M_current; |
| 3346 | } |
| 3347 | |
| 3348 | _Parent* _M_parent = nullptr; |
| 3349 | |
| 3350 | [[no_unique_address]] |
| 3351 | __detail::__maybe_present_t<forward_range<_Vp>, |
| 3352 | iterator_t<_Base>> _M_current; |
| 3353 | bool _M_trailing_empty = false; |
| 3354 | |
| 3355 | public: |
| 3356 | using iterator_concept = __conditional_t<forward_range<_Base>, |
| 3357 | forward_iterator_tag, |
| 3358 | input_iterator_tag>; |
| 3359 | // iterator_category defined in __lazy_split_view_outer_iter_cat |
| 3360 | using difference_type = range_difference_t<_Base>; |
| 3361 | |
| 3362 | struct value_type : view_interface<value_type> |
| 3363 | { |
| 3364 | private: |
| 3365 | _OuterIter _M_i = _OuterIter(); |
| 3366 | |
| 3367 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3368 | // 4013. lazy_split_view::outer-iterator::value_type should not |
| 3369 | // provide default constructor |
| 3370 | constexpr explicit |
| 3371 | value_type(_OuterIter __i) |
| 3372 | : _M_i(std::move(__i)) |
| 3373 | { } |
| 3374 | |
| 3375 | friend _OuterIter; |
| 3376 | |
| 3377 | public: |
| 3378 | constexpr _InnerIter<_Const> |
| 3379 | begin() const |
| 3380 | { return _InnerIter<_Const>{_M_i}; } |
| 3381 | |
| 3382 | constexpr default_sentinel_t |
| 3383 | end() const noexcept |
| 3384 | { return default_sentinel; } |
| 3385 | }; |
| 3386 | |
| 3387 | _OuterIter() = default; |
| 3388 | |
| 3389 | constexpr explicit |
| 3390 | _OuterIter(_Parent* __parent) requires (!forward_range<_Base>) |
| 3391 | : _M_parent(__parent) |
| 3392 | { } |
| 3393 | |
| 3394 | constexpr |
| 3395 | _OuterIter(_Parent* __parent, iterator_t<_Base> __current) |
| 3396 | requires forward_range<_Base> |
| 3397 | : _M_parent(__parent), |
| 3398 | _M_current(std::move(__current)) |
| 3399 | { } |
| 3400 | |
| 3401 | constexpr |
| 3402 | _OuterIter(_OuterIter<!_Const> __i) |
| 3403 | requires _Const |
| 3404 | && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 3405 | : _M_parent(__i._M_parent), _M_current(std::move(__i._M_current)), |
| 3406 | _M_trailing_empty(__i._M_trailing_empty) |
| 3407 | { } |
| 3408 | |
| 3409 | constexpr value_type |
| 3410 | operator*() const |
| 3411 | { return value_type{*this}; } |
| 3412 | |
| 3413 | constexpr _OuterIter& |
| 3414 | operator++() |
| 3415 | { |
| 3416 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3417 | // 3505. lazy_split_view::outer-iterator::operator++ misspecified |
| 3418 | const auto __end = ranges::end(_M_parent->_M_base); |
| 3419 | if (__current() == __end) |
| 3420 | { |
| 3421 | _M_trailing_empty = false; |
| 3422 | return *this; |
| 3423 | } |
| 3424 | const auto [__pbegin, __pend] = subrange{_M_parent->_M_pattern}; |
| 3425 | if (__pbegin == __pend) |
| 3426 | ++__current(); |
| 3427 | else if constexpr (__detail::__tiny_range<_Pattern>) |
| 3428 | { |
| 3429 | __current() = ranges::find(std::move(__current()), __end, |
| 3430 | *__pbegin); |
| 3431 | if (__current() != __end) |
| 3432 | { |
| 3433 | ++__current(); |
| 3434 | if (__current() == __end) |
| 3435 | _M_trailing_empty = true; |
| 3436 | } |
| 3437 | } |
| 3438 | else |
| 3439 | do |
| 3440 | { |
| 3441 | auto [__b, __p] |
| 3442 | = ranges::mismatch(__current(), __end, __pbegin, __pend); |
| 3443 | if (__p == __pend) |
| 3444 | { |
| 3445 | __current() = __b; |
| 3446 | if (__current() == __end) |
| 3447 | _M_trailing_empty = true; |
| 3448 | break; |
| 3449 | } |
| 3450 | } while (++__current() != __end); |
| 3451 | return *this; |
| 3452 | } |
| 3453 | |
| 3454 | constexpr decltype(auto) |
| 3455 | operator++(int) |
| 3456 | { |
| 3457 | if constexpr (forward_range<_Base>) |
| 3458 | { |
| 3459 | auto __tmp = *this; |
| 3460 | ++*this; |
| 3461 | return __tmp; |
| 3462 | } |
| 3463 | else |
| 3464 | ++*this; |
| 3465 | } |
| 3466 | |
| 3467 | friend constexpr bool |
| 3468 | operator==(const _OuterIter& __x, const _OuterIter& __y) |
| 3469 | requires forward_range<_Base> |
| 3470 | { |
| 3471 | return __x._M_current == __y._M_current |
| 3472 | && __x._M_trailing_empty == __y._M_trailing_empty; |
| 3473 | } |
| 3474 | |
| 3475 | friend constexpr bool |
| 3476 | operator==(const _OuterIter& __x, default_sentinel_t) |
| 3477 | { return __x.__at_end(); }; |
| 3478 | |
| 3479 | friend _OuterIter<!_Const>; |
| 3480 | friend _InnerIter<_Const>; |
| 3481 | }; |
| 3482 | |
| 3483 | template<bool _Const> |
| 3484 | struct _InnerIter |
| 3485 | : __detail::__lazy_split_view_inner_iter_cat<_Base<_Const>> |
| 3486 | { |
| 3487 | private: |
| 3488 | using _Base = lazy_split_view::_Base<_Const>; |
| 3489 | |
| 3490 | constexpr bool |
| 3491 | __at_end() const |
| 3492 | { |
| 3493 | auto [__pcur, __pend] = subrange{_M_i._M_parent->_M_pattern}; |
| 3494 | auto __end = ranges::end(_M_i._M_parent->_M_base); |
| 3495 | if constexpr (__detail::__tiny_range<_Pattern>) |
| 3496 | { |
| 3497 | const auto& __cur = _M_i_current(); |
| 3498 | if (__cur == __end) |
| 3499 | return true; |
| 3500 | if (__pcur == __pend) |
| 3501 | return _M_incremented; |
| 3502 | return *__cur == *__pcur; |
| 3503 | } |
| 3504 | else |
| 3505 | { |
| 3506 | auto __cur = _M_i_current(); |
| 3507 | if (__cur == __end) |
| 3508 | return true; |
| 3509 | if (__pcur == __pend) |
| 3510 | return _M_incremented; |
| 3511 | do |
| 3512 | { |
| 3513 | if (*__cur != *__pcur) |
| 3514 | return false; |
| 3515 | if (++__pcur == __pend) |
| 3516 | return true; |
| 3517 | } while (++__cur != __end); |
| 3518 | return false; |
| 3519 | } |
| 3520 | } |
| 3521 | |
| 3522 | constexpr auto& |
| 3523 | _M_i_current() noexcept |
| 3524 | { return _M_i.__current(); } |
| 3525 | |
| 3526 | constexpr auto& |
| 3527 | _M_i_current() const noexcept |
| 3528 | { return _M_i.__current(); } |
| 3529 | |
| 3530 | _OuterIter<_Const> _M_i = _OuterIter<_Const>(); |
| 3531 | bool _M_incremented = false; |
| 3532 | |
| 3533 | public: |
| 3534 | using iterator_concept |
| 3535 | = typename _OuterIter<_Const>::iterator_concept; |
| 3536 | // iterator_category defined in __lazy_split_view_inner_iter_cat |
| 3537 | using value_type = range_value_t<_Base>; |
| 3538 | using difference_type = range_difference_t<_Base>; |
| 3539 | |
| 3540 | _InnerIter() = default; |
| 3541 | |
| 3542 | constexpr explicit |
| 3543 | _InnerIter(_OuterIter<_Const> __i) |
| 3544 | : _M_i(std::move(__i)) |
| 3545 | { } |
| 3546 | |
| 3547 | constexpr const iterator_t<_Base>& |
| 3548 | base() const& noexcept |
| 3549 | { return _M_i_current(); } |
| 3550 | |
| 3551 | constexpr iterator_t<_Base> |
| 3552 | base() && requires forward_range<_Vp> |
| 3553 | { return std::move(_M_i_current()); } |
| 3554 | |
| 3555 | constexpr decltype(auto) |
| 3556 | operator*() const |
| 3557 | { return *_M_i_current(); } |
| 3558 | |
| 3559 | constexpr _InnerIter& |
| 3560 | operator++() |
| 3561 | { |
| 3562 | _M_incremented = true; |
| 3563 | if constexpr (!forward_range<_Base>) |
| 3564 | if constexpr (_Pattern::size() == 0) |
| 3565 | return *this; |
| 3566 | ++_M_i_current(); |
| 3567 | return *this; |
| 3568 | } |
| 3569 | |
| 3570 | constexpr decltype(auto) |
| 3571 | operator++(int) |
| 3572 | { |
| 3573 | if constexpr (forward_range<_Base>) |
| 3574 | { |
| 3575 | auto __tmp = *this; |
| 3576 | ++*this; |
| 3577 | return __tmp; |
| 3578 | } |
| 3579 | else |
| 3580 | ++*this; |
| 3581 | } |
| 3582 | |
| 3583 | friend constexpr bool |
| 3584 | operator==(const _InnerIter& __x, const _InnerIter& __y) |
| 3585 | requires forward_range<_Base> |
| 3586 | { return __x._M_i == __y._M_i; } |
| 3587 | |
| 3588 | friend constexpr bool |
| 3589 | operator==(const _InnerIter& __x, default_sentinel_t) |
| 3590 | { return __x.__at_end(); } |
| 3591 | |
| 3592 | friend constexpr decltype(auto) |
| 3593 | iter_move(const _InnerIter& __i) |
| 3594 | noexcept(noexcept(ranges::iter_move(__i._M_i_current()))) |
| 3595 | { return ranges::iter_move(__i._M_i_current()); } |
| 3596 | |
| 3597 | friend constexpr void |
| 3598 | iter_swap(const _InnerIter& __x, const _InnerIter& __y) |
| 3599 | noexcept(noexcept(ranges::iter_swap(__x._M_i_current(), |
| 3600 | __y._M_i_current()))) |
| 3601 | requires indirectly_swappable<iterator_t<_Base>> |
| 3602 | { ranges::iter_swap(__x._M_i_current(), __y._M_i_current()); } |
| 3603 | }; |
| 3604 | |
| 3605 | _Vp _M_base = _Vp(); |
| 3606 | _Pattern _M_pattern = _Pattern(); |
| 3607 | [[no_unique_address]] |
| 3608 | __detail::__maybe_present_t<!forward_range<_Vp>, |
| 3609 | __detail::__non_propagating_cache<iterator_t<_Vp>>> _M_current; |
| 3610 | |
| 3611 | |
| 3612 | public: |
| 3613 | lazy_split_view() requires (default_initializable<_Vp> |
| 3614 | && default_initializable<_Pattern>) |
| 3615 | = default; |
| 3616 | |
| 3617 | constexpr |
| 3618 | lazy_split_view(_Vp __base, _Pattern __pattern) |
| 3619 | : _M_base(std::move(__base)), _M_pattern(std::move(__pattern)) |
| 3620 | { } |
| 3621 | |
| 3622 | template<input_range _Range> |
| 3623 | requires constructible_from<_Vp, views::all_t<_Range>> |
| 3624 | && constructible_from<_Pattern, single_view<range_value_t<_Range>>> |
| 3625 | constexpr |
| 3626 | lazy_split_view(_Range&& __r, range_value_t<_Range> __e) |
| 3627 | : _M_base(views::all(std::forward<_Range>(__r))), |
| 3628 | _M_pattern(views::single(std::move(__e))) |
| 3629 | { } |
| 3630 | |
| 3631 | constexpr _Vp |
| 3632 | base() const& requires copy_constructible<_Vp> |
| 3633 | { return _M_base; } |
| 3634 | |
| 3635 | constexpr _Vp |
| 3636 | base() && |
| 3637 | { return std::move(_M_base); } |
| 3638 | |
| 3639 | constexpr auto |
| 3640 | begin() |
| 3641 | { |
| 3642 | if constexpr (forward_range<_Vp>) |
| 3643 | { |
| 3644 | constexpr bool __simple |
| 3645 | = __detail::__simple_view<_Vp> && __detail::__simple_view<_Pattern>; |
| 3646 | return _OuterIter<__simple>{this, ranges::begin(_M_base)}; |
| 3647 | } |
| 3648 | else |
| 3649 | { |
| 3650 | _M_current = ranges::begin(_M_base); |
| 3651 | return _OuterIter<false>{this}; |
| 3652 | } |
| 3653 | } |
| 3654 | |
| 3655 | constexpr auto |
| 3656 | begin() const requires forward_range<_Vp> && forward_range<const _Vp> |
| 3657 | { |
| 3658 | return _OuterIter<true>{this, ranges::begin(_M_base)}; |
| 3659 | } |
| 3660 | |
| 3661 | constexpr auto |
| 3662 | end() requires forward_range<_Vp> && common_range<_Vp> |
| 3663 | { |
| 3664 | constexpr bool __simple |
| 3665 | = __detail::__simple_view<_Vp> && __detail::__simple_view<_Pattern>; |
| 3666 | return _OuterIter<__simple>{this, ranges::end(_M_base)}; |
| 3667 | } |
| 3668 | |
| 3669 | constexpr auto |
| 3670 | end() const |
| 3671 | { |
| 3672 | if constexpr (forward_range<_Vp> |
| 3673 | && forward_range<const _Vp> |
| 3674 | && common_range<const _Vp>) |
| 3675 | return _OuterIter<true>{this, ranges::end(_M_base)}; |
| 3676 | else |
| 3677 | return default_sentinel; |
| 3678 | } |
| 3679 | }; |
| 3680 | |
| 3681 | template<typename _Range, typename _Pattern> |
| 3682 | lazy_split_view(_Range&&, _Pattern&&) |
| 3683 | -> lazy_split_view<views::all_t<_Range>, views::all_t<_Pattern>>; |
| 3684 | |
| 3685 | template<input_range _Range> |
| 3686 | lazy_split_view(_Range&&, range_value_t<_Range>) |
| 3687 | -> lazy_split_view<views::all_t<_Range>, single_view<range_value_t<_Range>>>; |
| 3688 | |
| 3689 | namespace views |
| 3690 | { |
| 3691 | namespace __detail |
| 3692 | { |
| 3693 | template<typename _Range, typename _Pattern> |
| 3694 | concept __can_lazy_split_view |
| 3695 | = requires { lazy_split_view(std::declval<_Range>(), std::declval<_Pattern>()); }; |
| 3696 | } // namespace __detail |
| 3697 | |
| 3698 | struct _LazySplit : __adaptor::_RangeAdaptor<_LazySplit> |
| 3699 | { |
| 3700 | template<viewable_range _Range, typename _Pattern> |
| 3701 | requires __detail::__can_lazy_split_view<_Range, _Pattern> |
| 3702 | constexpr auto |
| 3703 | operator() [[nodiscard]] (_Range&& __r, _Pattern&& __f) const |
| 3704 | { |
| 3705 | return lazy_split_view(std::forward<_Range>(__r), std::forward<_Pattern>(__f)); |
| 3706 | } |
| 3707 | |
| 3708 | using _RangeAdaptor<_LazySplit>::operator(); |
| 3709 | static constexpr int _S_arity = 2; |
| 3710 | // The pattern argument of views::lazy_split is not always simple -- it can be |
| 3711 | // a non-view range, the value category of which affects whether the call |
| 3712 | // is well-formed. But a scalar or a view pattern argument is surely |
| 3713 | // simple. |
| 3714 | template<typename _Pattern> |
| 3715 | static constexpr bool _S_has_simple_extra_args |
| 3716 | = is_scalar_v<_Pattern> || (view<_Pattern> |
| 3717 | && copy_constructible<_Pattern>); |
| 3718 | }; |
| 3719 | |
| 3720 | inline constexpr _LazySplit lazy_split; |
| 3721 | } // namespace views |
| 3722 | |
| 3723 | template<forward_range _Vp, forward_range _Pattern> |
| 3724 | requires view<_Vp> && view<_Pattern> |
| 3725 | && indirectly_comparable<iterator_t<_Vp>, iterator_t<_Pattern>, |
| 3726 | ranges::equal_to> |
| 3727 | class split_view : public view_interface<split_view<_Vp, _Pattern>> |
| 3728 | { |
| 3729 | private: |
| 3730 | _Vp _M_base = _Vp(); |
| 3731 | _Pattern _M_pattern = _Pattern(); |
| 3732 | __detail::__non_propagating_cache<subrange<iterator_t<_Vp>>> _M_cached_begin; |
| 3733 | |
| 3734 | struct _Iterator; |
| 3735 | struct _Sentinel; |
| 3736 | |
| 3737 | public: |
| 3738 | split_view() requires (default_initializable<_Vp> |
| 3739 | && default_initializable<_Pattern>) |
| 3740 | = default; |
| 3741 | |
| 3742 | constexpr |
| 3743 | split_view(_Vp __base, _Pattern __pattern) |
| 3744 | : _M_base(std::move(__base)), _M_pattern(std::move(__pattern)) |
| 3745 | { } |
| 3746 | |
| 3747 | template<forward_range _Range> |
| 3748 | requires constructible_from<_Vp, views::all_t<_Range>> |
| 3749 | && constructible_from<_Pattern, single_view<range_value_t<_Range>>> |
| 3750 | constexpr |
| 3751 | split_view(_Range&& __r, range_value_t<_Range> __e) |
| 3752 | : _M_base(views::all(std::forward<_Range>(__r))), |
| 3753 | _M_pattern(views::single(std::move(__e))) |
| 3754 | { } |
| 3755 | |
| 3756 | constexpr _Vp |
| 3757 | base() const& requires copy_constructible<_Vp> |
| 3758 | { return _M_base; } |
| 3759 | |
| 3760 | constexpr _Vp |
| 3761 | base() && |
| 3762 | { return std::move(_M_base); } |
| 3763 | |
| 3764 | constexpr _Iterator |
| 3765 | begin() |
| 3766 | { |
| 3767 | if (!_M_cached_begin) |
| 3768 | _M_cached_begin = _M_find_next(it: ranges::begin(_M_base)); |
| 3769 | return {this, ranges::begin(_M_base), *_M_cached_begin}; |
| 3770 | } |
| 3771 | |
| 3772 | constexpr auto |
| 3773 | end() |
| 3774 | { |
| 3775 | if constexpr (common_range<_Vp>) |
| 3776 | return _Iterator{this, ranges::end(_M_base), {}}; |
| 3777 | else |
| 3778 | return _Sentinel{this}; |
| 3779 | } |
| 3780 | |
| 3781 | constexpr subrange<iterator_t<_Vp>> |
| 3782 | _M_find_next(iterator_t<_Vp> __it) |
| 3783 | { |
| 3784 | auto [__b, __e] = ranges::search(subrange(__it, ranges::end(_M_base)), _M_pattern); |
| 3785 | if (__b != ranges::end(_M_base) && ranges::empty(_M_pattern)) |
| 3786 | { |
| 3787 | ++__b; |
| 3788 | ++__e; |
| 3789 | } |
| 3790 | return {__b, __e}; |
| 3791 | } |
| 3792 | |
| 3793 | private: |
| 3794 | struct _Iterator |
| 3795 | { |
| 3796 | private: |
| 3797 | split_view* _M_parent = nullptr; |
| 3798 | iterator_t<_Vp> _M_cur = iterator_t<_Vp>(); |
| 3799 | subrange<iterator_t<_Vp>> _M_next = subrange<iterator_t<_Vp>>(); |
| 3800 | bool _M_trailing_empty = false; |
| 3801 | |
| 3802 | friend struct _Sentinel; |
| 3803 | |
| 3804 | public: |
| 3805 | using iterator_concept = forward_iterator_tag; |
| 3806 | using iterator_category = input_iterator_tag; |
| 3807 | using value_type = subrange<iterator_t<_Vp>>; |
| 3808 | using difference_type = range_difference_t<_Vp>; |
| 3809 | |
| 3810 | _Iterator() = default; |
| 3811 | |
| 3812 | constexpr |
| 3813 | _Iterator(split_view* __parent, |
| 3814 | iterator_t<_Vp> __current, |
| 3815 | subrange<iterator_t<_Vp>> __next) |
| 3816 | : _M_parent(__parent), |
| 3817 | _M_cur(std::move(__current)), |
| 3818 | _M_next(std::move(__next)) |
| 3819 | { } |
| 3820 | |
| 3821 | constexpr iterator_t<_Vp> |
| 3822 | base() const |
| 3823 | { return _M_cur; } |
| 3824 | |
| 3825 | constexpr value_type |
| 3826 | operator*() const |
| 3827 | { return {_M_cur, _M_next.begin()}; } |
| 3828 | |
| 3829 | constexpr _Iterator& |
| 3830 | operator++() |
| 3831 | { |
| 3832 | _M_cur = _M_next.begin(); |
| 3833 | if (_M_cur != ranges::end(_M_parent->_M_base)) |
| 3834 | { |
| 3835 | _M_cur = _M_next.end(); |
| 3836 | if (_M_cur == ranges::end(_M_parent->_M_base)) |
| 3837 | { |
| 3838 | _M_trailing_empty = true; |
| 3839 | _M_next = {_M_cur, _M_cur}; |
| 3840 | } |
| 3841 | else |
| 3842 | _M_next = _M_parent->_M_find_next(it: _M_cur); |
| 3843 | } |
| 3844 | else |
| 3845 | _M_trailing_empty = false; |
| 3846 | return *this; |
| 3847 | } |
| 3848 | |
| 3849 | constexpr _Iterator |
| 3850 | operator++(int) |
| 3851 | { |
| 3852 | auto __tmp = *this; |
| 3853 | ++*this; |
| 3854 | return __tmp; |
| 3855 | } |
| 3856 | |
| 3857 | friend constexpr bool |
| 3858 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 3859 | { |
| 3860 | return __x._M_cur == __y._M_cur |
| 3861 | && __x._M_trailing_empty == __y._M_trailing_empty; |
| 3862 | } |
| 3863 | }; |
| 3864 | |
| 3865 | struct _Sentinel |
| 3866 | { |
| 3867 | private: |
| 3868 | sentinel_t<_Vp> _M_end = sentinel_t<_Vp>(); |
| 3869 | |
| 3870 | constexpr bool |
| 3871 | _M_equal(const _Iterator& __x) const |
| 3872 | { return __x._M_cur == _M_end && !__x._M_trailing_empty; } |
| 3873 | |
| 3874 | public: |
| 3875 | _Sentinel() = default; |
| 3876 | |
| 3877 | constexpr explicit |
| 3878 | _Sentinel(split_view* __parent) |
| 3879 | : _M_end(ranges::end(__parent->_M_base)) |
| 3880 | { } |
| 3881 | |
| 3882 | friend constexpr bool |
| 3883 | operator==(const _Iterator& __x, const _Sentinel& __y) |
| 3884 | { return __y._M_equal(__x); } |
| 3885 | }; |
| 3886 | }; |
| 3887 | |
| 3888 | template<typename _Range, typename _Pattern> |
| 3889 | split_view(_Range&&, _Pattern&&) |
| 3890 | -> split_view<views::all_t<_Range>, views::all_t<_Pattern>>; |
| 3891 | |
| 3892 | template<forward_range _Range> |
| 3893 | split_view(_Range&&, range_value_t<_Range>) |
| 3894 | -> split_view<views::all_t<_Range>, single_view<range_value_t<_Range>>>; |
| 3895 | |
| 3896 | namespace views |
| 3897 | { |
| 3898 | namespace __detail |
| 3899 | { |
| 3900 | template<typename _Range, typename _Pattern> |
| 3901 | concept __can_split_view |
| 3902 | = requires { split_view(std::declval<_Range>(), std::declval<_Pattern>()); }; |
| 3903 | } // namespace __detail |
| 3904 | |
| 3905 | struct _Split : __adaptor::_RangeAdaptor<_Split> |
| 3906 | { |
| 3907 | template<viewable_range _Range, typename _Pattern> |
| 3908 | requires __detail::__can_split_view<_Range, _Pattern> |
| 3909 | constexpr auto |
| 3910 | operator() [[nodiscard]] (_Range&& __r, _Pattern&& __f) const |
| 3911 | { |
| 3912 | return split_view(std::forward<_Range>(__r), std::forward<_Pattern>(__f)); |
| 3913 | } |
| 3914 | |
| 3915 | using _RangeAdaptor<_Split>::operator(); |
| 3916 | static constexpr int _S_arity = 2; |
| 3917 | template<typename _Pattern> |
| 3918 | static constexpr bool _S_has_simple_extra_args |
| 3919 | = _LazySplit::_S_has_simple_extra_args<_Pattern>; |
| 3920 | }; |
| 3921 | |
| 3922 | inline constexpr _Split split; |
| 3923 | } // namespace views |
| 3924 | |
| 3925 | namespace views |
| 3926 | { |
| 3927 | struct _Counted |
| 3928 | { |
| 3929 | template<input_or_output_iterator _Iter> |
| 3930 | constexpr auto |
| 3931 | operator() [[nodiscard]] (_Iter __i, iter_difference_t<_Iter> __n) const |
| 3932 | { |
| 3933 | if constexpr (contiguous_iterator<_Iter>) |
| 3934 | return span(std::__to_address(__i), __n); |
| 3935 | else if constexpr (random_access_iterator<_Iter>) |
| 3936 | return subrange(__i, __i + __n); |
| 3937 | else |
| 3938 | return subrange(counted_iterator(std::move(__i), __n), |
| 3939 | default_sentinel); |
| 3940 | } |
| 3941 | }; |
| 3942 | |
| 3943 | inline constexpr _Counted counted{}; |
| 3944 | } // namespace views |
| 3945 | |
| 3946 | template<view _Vp> |
| 3947 | requires (!common_range<_Vp>) && copyable<iterator_t<_Vp>> |
| 3948 | class common_view : public view_interface<common_view<_Vp>> |
| 3949 | { |
| 3950 | private: |
| 3951 | _Vp _M_base = _Vp(); |
| 3952 | |
| 3953 | public: |
| 3954 | common_view() requires default_initializable<_Vp> = default; |
| 3955 | |
| 3956 | constexpr explicit |
| 3957 | common_view(_Vp __r) |
| 3958 | : _M_base(std::move(__r)) |
| 3959 | { } |
| 3960 | |
| 3961 | constexpr _Vp |
| 3962 | base() const& requires copy_constructible<_Vp> |
| 3963 | { return _M_base; } |
| 3964 | |
| 3965 | constexpr _Vp |
| 3966 | base() && |
| 3967 | { return std::move(_M_base); } |
| 3968 | |
| 3969 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3970 | // 4012. common_view::begin/end are missing the simple-view check |
| 3971 | constexpr auto |
| 3972 | begin() requires (!__detail::__simple_view<_Vp>) |
| 3973 | { |
| 3974 | if constexpr (random_access_range<_Vp> && sized_range<_Vp>) |
| 3975 | return ranges::begin(_M_base); |
| 3976 | else |
| 3977 | return common_iterator<iterator_t<_Vp>, sentinel_t<_Vp>> |
| 3978 | (ranges::begin(_M_base)); |
| 3979 | } |
| 3980 | |
| 3981 | constexpr auto |
| 3982 | begin() const requires range<const _Vp> |
| 3983 | { |
| 3984 | if constexpr (random_access_range<const _Vp> && sized_range<const _Vp>) |
| 3985 | return ranges::begin(_M_base); |
| 3986 | else |
| 3987 | return common_iterator<iterator_t<const _Vp>, sentinel_t<const _Vp>> |
| 3988 | (ranges::begin(_M_base)); |
| 3989 | } |
| 3990 | |
| 3991 | constexpr auto |
| 3992 | end() requires (!__detail::__simple_view<_Vp>) |
| 3993 | { |
| 3994 | if constexpr (random_access_range<_Vp> && sized_range<_Vp>) |
| 3995 | return ranges::begin(_M_base) + ranges::size(_M_base); |
| 3996 | else |
| 3997 | return common_iterator<iterator_t<_Vp>, sentinel_t<_Vp>> |
| 3998 | (ranges::end(_M_base)); |
| 3999 | } |
| 4000 | |
| 4001 | constexpr auto |
| 4002 | end() const requires range<const _Vp> |
| 4003 | { |
| 4004 | if constexpr (random_access_range<const _Vp> && sized_range<const _Vp>) |
| 4005 | return ranges::begin(_M_base) + ranges::size(_M_base); |
| 4006 | else |
| 4007 | return common_iterator<iterator_t<const _Vp>, sentinel_t<const _Vp>> |
| 4008 | (ranges::end(_M_base)); |
| 4009 | } |
| 4010 | |
| 4011 | constexpr auto |
| 4012 | size() requires sized_range<_Vp> |
| 4013 | { return ranges::size(_M_base); } |
| 4014 | |
| 4015 | constexpr auto |
| 4016 | size() const requires sized_range<const _Vp> |
| 4017 | { return ranges::size(_M_base); } |
| 4018 | }; |
| 4019 | |
| 4020 | template<typename _Range> |
| 4021 | common_view(_Range&&) -> common_view<views::all_t<_Range>>; |
| 4022 | |
| 4023 | template<typename _Tp> |
| 4024 | inline constexpr bool enable_borrowed_range<common_view<_Tp>> |
| 4025 | = enable_borrowed_range<_Tp>; |
| 4026 | |
| 4027 | namespace views |
| 4028 | { |
| 4029 | namespace __detail |
| 4030 | { |
| 4031 | template<typename _Range> |
| 4032 | concept __already_common = common_range<_Range> |
| 4033 | && requires { views::all(std::declval<_Range>()); }; |
| 4034 | |
| 4035 | template<typename _Range> |
| 4036 | concept __can_common_view |
| 4037 | = requires { common_view{std::declval<_Range>()}; }; |
| 4038 | } // namespace __detail |
| 4039 | |
| 4040 | struct _Common : __adaptor::_RangeAdaptorClosure<_Common> |
| 4041 | { |
| 4042 | template<viewable_range _Range> |
| 4043 | requires __detail::__already_common<_Range> |
| 4044 | || __detail::__can_common_view<_Range> |
| 4045 | constexpr auto |
| 4046 | operator() [[nodiscard]] (_Range&& __r) const |
| 4047 | { |
| 4048 | if constexpr (__detail::__already_common<_Range>) |
| 4049 | return views::all(std::forward<_Range>(__r)); |
| 4050 | else |
| 4051 | return common_view{std::forward<_Range>(__r)}; |
| 4052 | } |
| 4053 | |
| 4054 | static constexpr bool _S_has_simple_call_op = true; |
| 4055 | }; |
| 4056 | |
| 4057 | inline constexpr _Common common; |
| 4058 | } // namespace views |
| 4059 | |
| 4060 | template<view _Vp> |
| 4061 | requires bidirectional_range<_Vp> |
| 4062 | class reverse_view : public view_interface<reverse_view<_Vp>> |
| 4063 | { |
| 4064 | private: |
| 4065 | static constexpr bool _S_needs_cached_begin |
| 4066 | = !common_range<_Vp> && !(random_access_range<_Vp> |
| 4067 | && sized_sentinel_for<sentinel_t<_Vp>, |
| 4068 | iterator_t<_Vp>>); |
| 4069 | |
| 4070 | _Vp _M_base = _Vp(); |
| 4071 | [[no_unique_address]] |
| 4072 | __detail::__maybe_present_t<_S_needs_cached_begin, |
| 4073 | __detail::_CachedPosition<_Vp>> |
| 4074 | _M_cached_begin; |
| 4075 | |
| 4076 | public: |
| 4077 | reverse_view() requires default_initializable<_Vp> = default; |
| 4078 | |
| 4079 | constexpr explicit |
| 4080 | reverse_view(_Vp __r) |
| 4081 | : _M_base(std::move(__r)) |
| 4082 | { } |
| 4083 | |
| 4084 | constexpr _Vp |
| 4085 | base() const& requires copy_constructible<_Vp> |
| 4086 | { return _M_base; } |
| 4087 | |
| 4088 | constexpr _Vp |
| 4089 | base() && |
| 4090 | { return std::move(_M_base); } |
| 4091 | |
| 4092 | constexpr reverse_iterator<iterator_t<_Vp>> |
| 4093 | begin() |
| 4094 | { |
| 4095 | if constexpr (_S_needs_cached_begin) |
| 4096 | if (_M_cached_begin._M_has_value()) |
| 4097 | return std::make_reverse_iterator(_M_cached_begin._M_get(_M_base)); |
| 4098 | |
| 4099 | auto __it = ranges::next(ranges::begin(_M_base), ranges::end(_M_base)); |
| 4100 | if constexpr (_S_needs_cached_begin) |
| 4101 | _M_cached_begin._M_set(_M_base, __it); |
| 4102 | return std::make_reverse_iterator(std::move(__it)); |
| 4103 | } |
| 4104 | |
| 4105 | constexpr auto |
| 4106 | begin() requires common_range<_Vp> |
| 4107 | { return std::make_reverse_iterator(ranges::end(_M_base)); } |
| 4108 | |
| 4109 | constexpr auto |
| 4110 | begin() const requires common_range<const _Vp> |
| 4111 | { return std::make_reverse_iterator(ranges::end(_M_base)); } |
| 4112 | |
| 4113 | constexpr reverse_iterator<iterator_t<_Vp>> |
| 4114 | end() |
| 4115 | { return std::make_reverse_iterator(ranges::begin(_M_base)); } |
| 4116 | |
| 4117 | constexpr auto |
| 4118 | end() const requires common_range<const _Vp> |
| 4119 | { return std::make_reverse_iterator(ranges::begin(_M_base)); } |
| 4120 | |
| 4121 | constexpr auto |
| 4122 | size() requires sized_range<_Vp> |
| 4123 | { return ranges::size(_M_base); } |
| 4124 | |
| 4125 | constexpr auto |
| 4126 | size() const requires sized_range<const _Vp> |
| 4127 | { return ranges::size(_M_base); } |
| 4128 | }; |
| 4129 | |
| 4130 | template<typename _Range> |
| 4131 | reverse_view(_Range&&) -> reverse_view<views::all_t<_Range>>; |
| 4132 | |
| 4133 | template<typename _Tp> |
| 4134 | inline constexpr bool enable_borrowed_range<reverse_view<_Tp>> |
| 4135 | = enable_borrowed_range<_Tp>; |
| 4136 | |
| 4137 | namespace views |
| 4138 | { |
| 4139 | namespace __detail |
| 4140 | { |
| 4141 | template<typename> |
| 4142 | inline constexpr bool __is_reversible_subrange = false; |
| 4143 | |
| 4144 | template<typename _Iter, subrange_kind _Kind> |
| 4145 | inline constexpr bool |
| 4146 | __is_reversible_subrange<subrange<reverse_iterator<_Iter>, |
| 4147 | reverse_iterator<_Iter>, |
| 4148 | _Kind>> = true; |
| 4149 | |
| 4150 | template<typename> |
| 4151 | inline constexpr bool __is_reverse_view = false; |
| 4152 | |
| 4153 | template<typename _Vp> |
| 4154 | inline constexpr bool __is_reverse_view<reverse_view<_Vp>> = true; |
| 4155 | |
| 4156 | template<typename _Range> |
| 4157 | concept __can_reverse_view |
| 4158 | = requires { reverse_view{std::declval<_Range>()}; }; |
| 4159 | } // namespace __detail |
| 4160 | |
| 4161 | struct _Reverse : __adaptor::_RangeAdaptorClosure<_Reverse> |
| 4162 | { |
| 4163 | template<viewable_range _Range> |
| 4164 | requires __detail::__is_reverse_view<remove_cvref_t<_Range>> |
| 4165 | || __detail::__is_reversible_subrange<remove_cvref_t<_Range>> |
| 4166 | || __detail::__can_reverse_view<_Range> |
| 4167 | constexpr auto |
| 4168 | operator() [[nodiscard]] (_Range&& __r) const |
| 4169 | { |
| 4170 | using _Tp = remove_cvref_t<_Range>; |
| 4171 | if constexpr (__detail::__is_reverse_view<_Tp>) |
| 4172 | return std::forward<_Range>(__r).base(); |
| 4173 | else if constexpr (__detail::__is_reversible_subrange<_Tp>) |
| 4174 | { |
| 4175 | using _Iter = decltype(ranges::begin(__r).base()); |
| 4176 | if constexpr (sized_range<_Tp>) |
| 4177 | return subrange<_Iter, _Iter, subrange_kind::sized> |
| 4178 | {__r.end().base(), __r.begin().base(), __r.size()}; |
| 4179 | else |
| 4180 | return subrange<_Iter, _Iter, subrange_kind::unsized> |
| 4181 | {__r.end().base(), __r.begin().base()}; |
| 4182 | } |
| 4183 | else |
| 4184 | return reverse_view{std::forward<_Range>(__r)}; |
| 4185 | } |
| 4186 | |
| 4187 | static constexpr bool _S_has_simple_call_op = true; |
| 4188 | }; |
| 4189 | |
| 4190 | inline constexpr _Reverse reverse; |
| 4191 | } // namespace views |
| 4192 | |
| 4193 | namespace __detail |
| 4194 | { |
| 4195 | #if __cpp_lib_tuple_like // >= C++23 |
| 4196 | template<typename _Tp, size_t _Nm> |
| 4197 | concept __has_tuple_element = __tuple_like<_Tp> && _Nm < tuple_size_v<_Tp>; |
| 4198 | #else |
| 4199 | template<typename _Tp, size_t _Nm> |
| 4200 | concept __has_tuple_element = requires(_Tp __t) |
| 4201 | { |
| 4202 | typename tuple_size<_Tp>::type; |
| 4203 | requires _Nm < tuple_size_v<_Tp>; |
| 4204 | typename tuple_element_t<_Nm, _Tp>; |
| 4205 | { std::get<_Nm>(__t) } |
| 4206 | -> convertible_to<const tuple_element_t<_Nm, _Tp>&>; |
| 4207 | }; |
| 4208 | #endif |
| 4209 | |
| 4210 | template<typename _Tp, size_t _Nm> |
| 4211 | concept __returnable_element |
| 4212 | = is_reference_v<_Tp> || move_constructible<tuple_element_t<_Nm, _Tp>>; |
| 4213 | } |
| 4214 | |
| 4215 | template<input_range _Vp, size_t _Nm> |
| 4216 | requires view<_Vp> |
| 4217 | && __detail::__has_tuple_element<range_value_t<_Vp>, _Nm> |
| 4218 | && __detail::__has_tuple_element<remove_reference_t<range_reference_t<_Vp>>, |
| 4219 | _Nm> |
| 4220 | && __detail::__returnable_element<range_reference_t<_Vp>, _Nm> |
| 4221 | class elements_view : public view_interface<elements_view<_Vp, _Nm>> |
| 4222 | { |
| 4223 | public: |
| 4224 | elements_view() requires default_initializable<_Vp> = default; |
| 4225 | |
| 4226 | constexpr explicit |
| 4227 | elements_view(_Vp __base) |
| 4228 | : _M_base(std::move(__base)) |
| 4229 | { } |
| 4230 | |
| 4231 | constexpr _Vp |
| 4232 | base() const& requires copy_constructible<_Vp> |
| 4233 | { return _M_base; } |
| 4234 | |
| 4235 | constexpr _Vp |
| 4236 | base() && |
| 4237 | { return std::move(_M_base); } |
| 4238 | |
| 4239 | constexpr auto |
| 4240 | begin() requires (!__detail::__simple_view<_Vp>) |
| 4241 | { return _Iterator<false>(ranges::begin(_M_base)); } |
| 4242 | |
| 4243 | constexpr auto |
| 4244 | begin() const requires range<const _Vp> |
| 4245 | { return _Iterator<true>(ranges::begin(_M_base)); } |
| 4246 | |
| 4247 | constexpr auto |
| 4248 | end() requires (!__detail::__simple_view<_Vp> && !common_range<_Vp>) |
| 4249 | { return _Sentinel<false>{ranges::end(_M_base)}; } |
| 4250 | |
| 4251 | constexpr auto |
| 4252 | end() requires (!__detail::__simple_view<_Vp> && common_range<_Vp>) |
| 4253 | { return _Iterator<false>{ranges::end(_M_base)}; } |
| 4254 | |
| 4255 | constexpr auto |
| 4256 | end() const requires range<const _Vp> |
| 4257 | { return _Sentinel<true>{ranges::end(_M_base)}; } |
| 4258 | |
| 4259 | constexpr auto |
| 4260 | end() const requires common_range<const _Vp> |
| 4261 | { return _Iterator<true>{ranges::end(_M_base)}; } |
| 4262 | |
| 4263 | constexpr auto |
| 4264 | size() requires sized_range<_Vp> |
| 4265 | { return ranges::size(_M_base); } |
| 4266 | |
| 4267 | constexpr auto |
| 4268 | size() const requires sized_range<const _Vp> |
| 4269 | { return ranges::size(_M_base); } |
| 4270 | |
| 4271 | private: |
| 4272 | template<bool _Const> |
| 4273 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 4274 | |
| 4275 | template<bool _Const> |
| 4276 | struct __iter_cat |
| 4277 | { }; |
| 4278 | |
| 4279 | template<bool _Const> |
| 4280 | requires forward_range<_Base<_Const>> |
| 4281 | struct __iter_cat<_Const> |
| 4282 | { |
| 4283 | private: |
| 4284 | static auto _S_iter_cat() |
| 4285 | { |
| 4286 | using _Base = elements_view::_Base<_Const>; |
| 4287 | using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 4288 | using _Res = decltype((std::get<_Nm>(*std::declval<iterator_t<_Base>>()))); |
| 4289 | if constexpr (!is_lvalue_reference_v<_Res>) |
| 4290 | return input_iterator_tag{}; |
| 4291 | else if constexpr (derived_from<_Cat, random_access_iterator_tag>) |
| 4292 | return random_access_iterator_tag{}; |
| 4293 | else |
| 4294 | return _Cat{}; |
| 4295 | } |
| 4296 | public: |
| 4297 | using iterator_category = decltype(_S_iter_cat()); |
| 4298 | }; |
| 4299 | |
| 4300 | template<bool _Const> |
| 4301 | struct _Sentinel; |
| 4302 | |
| 4303 | template<bool _Const> |
| 4304 | struct _Iterator : __iter_cat<_Const> |
| 4305 | { |
| 4306 | private: |
| 4307 | using _Base = elements_view::_Base<_Const>; |
| 4308 | |
| 4309 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 4310 | |
| 4311 | static constexpr decltype(auto) |
| 4312 | _S_get_element(const iterator_t<_Base>& __i) |
| 4313 | { |
| 4314 | if constexpr (is_reference_v<range_reference_t<_Base>>) |
| 4315 | return std::get<_Nm>(*__i); |
| 4316 | else |
| 4317 | { |
| 4318 | using _Et = remove_cv_t<tuple_element_t<_Nm, range_reference_t<_Base>>>; |
| 4319 | return static_cast<_Et>(std::get<_Nm>(*__i)); |
| 4320 | } |
| 4321 | } |
| 4322 | |
| 4323 | static auto |
| 4324 | _S_iter_concept() |
| 4325 | { |
| 4326 | if constexpr (random_access_range<_Base>) |
| 4327 | return random_access_iterator_tag{}; |
| 4328 | else if constexpr (bidirectional_range<_Base>) |
| 4329 | return bidirectional_iterator_tag{}; |
| 4330 | else if constexpr (forward_range<_Base>) |
| 4331 | return forward_iterator_tag{}; |
| 4332 | else |
| 4333 | return input_iterator_tag{}; |
| 4334 | } |
| 4335 | |
| 4336 | friend _Iterator<!_Const>; |
| 4337 | |
| 4338 | public: |
| 4339 | using iterator_concept = decltype(_S_iter_concept()); |
| 4340 | // iterator_category defined in elements_view::__iter_cat |
| 4341 | using value_type |
| 4342 | = remove_cvref_t<tuple_element_t<_Nm, range_value_t<_Base>>>; |
| 4343 | using difference_type = range_difference_t<_Base>; |
| 4344 | |
| 4345 | _Iterator() requires default_initializable<iterator_t<_Base>> = default; |
| 4346 | |
| 4347 | constexpr explicit |
| 4348 | _Iterator(iterator_t<_Base> __current) |
| 4349 | : _M_current(std::move(__current)) |
| 4350 | { } |
| 4351 | |
| 4352 | constexpr |
| 4353 | _Iterator(_Iterator<!_Const> __i) |
| 4354 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 4355 | : _M_current(std::move(__i._M_current)) |
| 4356 | { } |
| 4357 | |
| 4358 | constexpr const iterator_t<_Base>& |
| 4359 | base() const& noexcept |
| 4360 | { return _M_current; } |
| 4361 | |
| 4362 | constexpr iterator_t<_Base> |
| 4363 | base() && |
| 4364 | { return std::move(_M_current); } |
| 4365 | |
| 4366 | constexpr decltype(auto) |
| 4367 | operator*() const |
| 4368 | { return _S_get_element(i: _M_current); } |
| 4369 | |
| 4370 | constexpr _Iterator& |
| 4371 | operator++() |
| 4372 | { |
| 4373 | ++_M_current; |
| 4374 | return *this; |
| 4375 | } |
| 4376 | |
| 4377 | constexpr void |
| 4378 | operator++(int) |
| 4379 | { ++_M_current; } |
| 4380 | |
| 4381 | constexpr _Iterator |
| 4382 | operator++(int) requires forward_range<_Base> |
| 4383 | { |
| 4384 | auto __tmp = *this; |
| 4385 | ++_M_current; |
| 4386 | return __tmp; |
| 4387 | } |
| 4388 | |
| 4389 | constexpr _Iterator& |
| 4390 | operator--() requires bidirectional_range<_Base> |
| 4391 | { |
| 4392 | --_M_current; |
| 4393 | return *this; |
| 4394 | } |
| 4395 | |
| 4396 | constexpr _Iterator |
| 4397 | operator--(int) requires bidirectional_range<_Base> |
| 4398 | { |
| 4399 | auto __tmp = *this; |
| 4400 | --_M_current; |
| 4401 | return __tmp; |
| 4402 | } |
| 4403 | |
| 4404 | constexpr _Iterator& |
| 4405 | operator+=(difference_type __n) |
| 4406 | requires random_access_range<_Base> |
| 4407 | { |
| 4408 | _M_current += __n; |
| 4409 | return *this; |
| 4410 | } |
| 4411 | |
| 4412 | constexpr _Iterator& |
| 4413 | operator-=(difference_type __n) |
| 4414 | requires random_access_range<_Base> |
| 4415 | { |
| 4416 | _M_current -= __n; |
| 4417 | return *this; |
| 4418 | } |
| 4419 | |
| 4420 | constexpr decltype(auto) |
| 4421 | operator[](difference_type __n) const |
| 4422 | requires random_access_range<_Base> |
| 4423 | { return _S_get_element(i: _M_current + __n); } |
| 4424 | |
| 4425 | friend constexpr bool |
| 4426 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 4427 | requires equality_comparable<iterator_t<_Base>> |
| 4428 | { return __x._M_current == __y._M_current; } |
| 4429 | |
| 4430 | friend constexpr bool |
| 4431 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 4432 | requires random_access_range<_Base> |
| 4433 | { return __x._M_current < __y._M_current; } |
| 4434 | |
| 4435 | friend constexpr bool |
| 4436 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 4437 | requires random_access_range<_Base> |
| 4438 | { return __y._M_current < __x._M_current; } |
| 4439 | |
| 4440 | friend constexpr bool |
| 4441 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 4442 | requires random_access_range<_Base> |
| 4443 | { return !(__y._M_current > __x._M_current); } |
| 4444 | |
| 4445 | friend constexpr bool |
| 4446 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 4447 | requires random_access_range<_Base> |
| 4448 | { return !(__x._M_current > __y._M_current); } |
| 4449 | |
| 4450 | #ifdef __cpp_lib_three_way_comparison |
| 4451 | friend constexpr auto |
| 4452 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 4453 | requires random_access_range<_Base> |
| 4454 | && three_way_comparable<iterator_t<_Base>> |
| 4455 | { return __x._M_current <=> __y._M_current; } |
| 4456 | #endif |
| 4457 | |
| 4458 | friend constexpr _Iterator |
| 4459 | operator+(const _Iterator& __x, difference_type __y) |
| 4460 | requires random_access_range<_Base> |
| 4461 | { return _Iterator{__x} += __y; } |
| 4462 | |
| 4463 | friend constexpr _Iterator |
| 4464 | operator+(difference_type __x, const _Iterator& __y) |
| 4465 | requires random_access_range<_Base> |
| 4466 | { return __y + __x; } |
| 4467 | |
| 4468 | friend constexpr _Iterator |
| 4469 | operator-(const _Iterator& __x, difference_type __y) |
| 4470 | requires random_access_range<_Base> |
| 4471 | { return _Iterator{__x} -= __y; } |
| 4472 | |
| 4473 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 4474 | // 3483. transform_view::iterator's difference is overconstrained |
| 4475 | friend constexpr difference_type |
| 4476 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 4477 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 4478 | { return __x._M_current - __y._M_current; } |
| 4479 | |
| 4480 | template <bool> friend struct _Sentinel; |
| 4481 | }; |
| 4482 | |
| 4483 | template<bool _Const> |
| 4484 | struct _Sentinel |
| 4485 | { |
| 4486 | private: |
| 4487 | template<bool _Const2> |
| 4488 | constexpr bool |
| 4489 | _M_equal(const _Iterator<_Const2>& __x) const |
| 4490 | { return __x._M_current == _M_end; } |
| 4491 | |
| 4492 | template<bool _Const2> |
| 4493 | constexpr auto |
| 4494 | _M_distance_from(const _Iterator<_Const2>& __i) const |
| 4495 | { return _M_end - __i._M_current; } |
| 4496 | |
| 4497 | using _Base = elements_view::_Base<_Const>; |
| 4498 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 4499 | |
| 4500 | public: |
| 4501 | _Sentinel() = default; |
| 4502 | |
| 4503 | constexpr explicit |
| 4504 | _Sentinel(sentinel_t<_Base> __end) |
| 4505 | : _M_end(std::move(__end)) |
| 4506 | { } |
| 4507 | |
| 4508 | constexpr |
| 4509 | _Sentinel(_Sentinel<!_Const> __other) |
| 4510 | requires _Const |
| 4511 | && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 4512 | : _M_end(std::move(__other._M_end)) |
| 4513 | { } |
| 4514 | |
| 4515 | constexpr sentinel_t<_Base> |
| 4516 | base() const |
| 4517 | { return _M_end; } |
| 4518 | |
| 4519 | template<bool _Const2> |
| 4520 | requires sentinel_for<sentinel_t<_Base>, |
| 4521 | iterator_t<__detail::__maybe_const_t<_Const2, _Vp>>> |
| 4522 | friend constexpr bool |
| 4523 | operator==(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 4524 | { return __y._M_equal(__x); } |
| 4525 | |
| 4526 | template<bool _Const2, |
| 4527 | typename _Base2 = __detail::__maybe_const_t<_Const2, _Vp>> |
| 4528 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 4529 | friend constexpr range_difference_t<_Base2> |
| 4530 | operator-(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 4531 | { return -__y._M_distance_from(__x); } |
| 4532 | |
| 4533 | template<bool _Const2, |
| 4534 | typename _Base2 = __detail::__maybe_const_t<_Const2, _Vp>> |
| 4535 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 4536 | friend constexpr range_difference_t<_Base2> |
| 4537 | operator-(const _Sentinel& __x, const _Iterator<_Const2>& __y) |
| 4538 | { return __x._M_distance_from(__y); } |
| 4539 | |
| 4540 | friend _Sentinel<!_Const>; |
| 4541 | }; |
| 4542 | |
| 4543 | _Vp _M_base = _Vp(); |
| 4544 | }; |
| 4545 | |
| 4546 | template<typename _Tp, size_t _Nm> |
| 4547 | inline constexpr bool enable_borrowed_range<elements_view<_Tp, _Nm>> |
| 4548 | = enable_borrowed_range<_Tp>; |
| 4549 | |
| 4550 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 4551 | // 3563. keys_view example is broken |
| 4552 | template<typename _Range> |
| 4553 | using keys_view = elements_view<_Range, 0>; |
| 4554 | |
| 4555 | template<typename _Range> |
| 4556 | using values_view = elements_view<_Range, 1>; |
| 4557 | |
| 4558 | namespace views |
| 4559 | { |
| 4560 | namespace __detail |
| 4561 | { |
| 4562 | template<size_t _Nm, typename _Range> |
| 4563 | concept __can_elements_view |
| 4564 | = requires { elements_view<all_t<_Range>, _Nm>{std::declval<_Range>()}; }; |
| 4565 | } // namespace __detail |
| 4566 | |
| 4567 | template<size_t _Nm> |
| 4568 | struct _Elements : __adaptor::_RangeAdaptorClosure<_Elements<_Nm>> |
| 4569 | { |
| 4570 | template<viewable_range _Range> |
| 4571 | requires __detail::__can_elements_view<_Nm, _Range> |
| 4572 | constexpr auto |
| 4573 | operator() [[nodiscard]] (_Range&& __r) const |
| 4574 | { |
| 4575 | return elements_view<all_t<_Range>, _Nm>{std::forward<_Range>(__r)}; |
| 4576 | } |
| 4577 | |
| 4578 | static constexpr bool _S_has_simple_call_op = true; |
| 4579 | }; |
| 4580 | |
| 4581 | template<size_t _Nm> |
| 4582 | inline constexpr _Elements<_Nm> elements; |
| 4583 | inline constexpr auto keys = elements<0>; |
| 4584 | inline constexpr auto values = elements<1>; |
| 4585 | } // namespace views |
| 4586 | |
| 4587 | #ifdef __cpp_lib_ranges_zip // C++ >= 23 |
| 4588 | namespace __detail |
| 4589 | { |
| 4590 | template<typename... _Rs> |
| 4591 | concept __zip_is_common = (sizeof...(_Rs) == 1 && (common_range<_Rs> && ...)) |
| 4592 | || (!(bidirectional_range<_Rs> && ...) && (common_range<_Rs> && ...)) |
| 4593 | || ((random_access_range<_Rs> && ...) && (sized_range<_Rs> && ...)); |
| 4594 | |
| 4595 | template<typename _Fp, typename _Tuple> |
| 4596 | constexpr auto |
| 4597 | __tuple_transform(_Fp&& __f, _Tuple&& __tuple) |
| 4598 | { |
| 4599 | return std::apply([&]<typename... _Ts>(_Ts&&... __elts) { |
| 4600 | return tuple<invoke_result_t<_Fp&, _Ts>...> |
| 4601 | (std::__invoke(__f, std::forward<_Ts>(__elts))...); |
| 4602 | }, std::forward<_Tuple>(__tuple)); |
| 4603 | } |
| 4604 | |
| 4605 | template<typename _Fp, typename _Tuple> |
| 4606 | constexpr void |
| 4607 | __tuple_for_each(_Fp&& __f, _Tuple&& __tuple) |
| 4608 | { |
| 4609 | std::apply([&]<typename... _Ts>(_Ts&&... __elts) { |
| 4610 | (std::__invoke(__f, std::forward<_Ts>(__elts)), ...); |
| 4611 | }, std::forward<_Tuple>(__tuple)); |
| 4612 | } |
| 4613 | } // namespace __detail |
| 4614 | |
| 4615 | template<input_range... _Vs> |
| 4616 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) |
| 4617 | class zip_view : public view_interface<zip_view<_Vs...>> |
| 4618 | { |
| 4619 | tuple<_Vs...> _M_views; |
| 4620 | |
| 4621 | template<bool> class _Iterator; |
| 4622 | template<bool> class _Sentinel; |
| 4623 | |
| 4624 | public: |
| 4625 | zip_view() = default; |
| 4626 | |
| 4627 | constexpr explicit |
| 4628 | zip_view(_Vs... __views) |
| 4629 | : _M_views(std::move(__views)...) |
| 4630 | { } |
| 4631 | |
| 4632 | constexpr auto |
| 4633 | begin() requires (!(__detail::__simple_view<_Vs> && ...)) |
| 4634 | { return _Iterator<false>(__detail::__tuple_transform(ranges::begin, _M_views)); } |
| 4635 | |
| 4636 | constexpr auto |
| 4637 | begin() const requires (range<const _Vs> && ...) |
| 4638 | { return _Iterator<true>(__detail::__tuple_transform(ranges::begin, _M_views)); } |
| 4639 | |
| 4640 | constexpr auto |
| 4641 | end() requires (!(__detail::__simple_view<_Vs> && ...)) |
| 4642 | { |
| 4643 | if constexpr (!__detail::__zip_is_common<_Vs...>) |
| 4644 | return _Sentinel<false>(__detail::__tuple_transform(ranges::end, _M_views)); |
| 4645 | else if constexpr ((random_access_range<_Vs> && ...)) |
| 4646 | return begin() + iter_difference_t<_Iterator<false>>(size()); |
| 4647 | else |
| 4648 | return _Iterator<false>(__detail::__tuple_transform(ranges::end, _M_views)); |
| 4649 | } |
| 4650 | |
| 4651 | constexpr auto |
| 4652 | end() const requires (range<const _Vs> && ...) |
| 4653 | { |
| 4654 | if constexpr (!__detail::__zip_is_common<const _Vs...>) |
| 4655 | return _Sentinel<true>(__detail::__tuple_transform(ranges::end, _M_views)); |
| 4656 | else if constexpr ((random_access_range<const _Vs> && ...)) |
| 4657 | return begin() + iter_difference_t<_Iterator<true>>(size()); |
| 4658 | else |
| 4659 | return _Iterator<true>(__detail::__tuple_transform(ranges::end, _M_views)); |
| 4660 | } |
| 4661 | |
| 4662 | constexpr auto |
| 4663 | size() requires (sized_range<_Vs> && ...) |
| 4664 | { |
| 4665 | return std::apply([](auto... sizes) { |
| 4666 | using _CT = __detail::__make_unsigned_like_t<common_type_t<decltype(sizes)...>>; |
| 4667 | return ranges::min({_CT(sizes)...}); |
| 4668 | }, __detail::__tuple_transform(ranges::size, _M_views)); |
| 4669 | } |
| 4670 | |
| 4671 | constexpr auto |
| 4672 | size() const requires (sized_range<const _Vs> && ...) |
| 4673 | { |
| 4674 | return std::apply([](auto... sizes) { |
| 4675 | using _CT = __detail::__make_unsigned_like_t<common_type_t<decltype(sizes)...>>; |
| 4676 | return ranges::min({_CT(sizes)...}); |
| 4677 | }, __detail::__tuple_transform(ranges::size, _M_views)); |
| 4678 | } |
| 4679 | }; |
| 4680 | |
| 4681 | template<typename... _Rs> |
| 4682 | zip_view(_Rs&&...) -> zip_view<views::all_t<_Rs>...>; |
| 4683 | |
| 4684 | template<typename... _Views> |
| 4685 | inline constexpr bool enable_borrowed_range<zip_view<_Views...>> |
| 4686 | = (enable_borrowed_range<_Views> && ...); |
| 4687 | |
| 4688 | namespace __detail |
| 4689 | { |
| 4690 | template<bool _Const, typename... _Vs> |
| 4691 | concept __all_random_access |
| 4692 | = (random_access_range<__maybe_const_t<_Const, _Vs>> && ...); |
| 4693 | |
| 4694 | template<bool _Const, typename... _Vs> |
| 4695 | concept __all_bidirectional |
| 4696 | = (bidirectional_range<__maybe_const_t<_Const, _Vs>> && ...); |
| 4697 | |
| 4698 | template<bool _Const, typename... _Vs> |
| 4699 | concept __all_forward |
| 4700 | = (forward_range<__maybe_const_t<_Const, _Vs>> && ...); |
| 4701 | |
| 4702 | template<bool _Const, typename... _Views> |
| 4703 | struct __zip_view_iter_cat |
| 4704 | { }; |
| 4705 | |
| 4706 | template<bool _Const, typename... _Views> |
| 4707 | requires __all_forward<_Const, _Views...> |
| 4708 | struct __zip_view_iter_cat<_Const, _Views...> |
| 4709 | { using iterator_category = input_iterator_tag; }; |
| 4710 | } // namespace __detail |
| 4711 | |
| 4712 | template<input_range... _Vs> |
| 4713 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) |
| 4714 | template<bool _Const> |
| 4715 | class zip_view<_Vs...>::_Iterator |
| 4716 | : public __detail::__zip_view_iter_cat<_Const, _Vs...> |
| 4717 | { |
| 4718 | #ifdef __clang__ // LLVM-61763 workaround |
| 4719 | public: |
| 4720 | #endif |
| 4721 | tuple<iterator_t<__detail::__maybe_const_t<_Const, _Vs>>...> _M_current; |
| 4722 | |
| 4723 | constexpr explicit |
| 4724 | _Iterator(decltype(_M_current) __current) |
| 4725 | : _M_current(std::move(__current)) |
| 4726 | { } |
| 4727 | |
| 4728 | static auto |
| 4729 | _S_iter_concept() |
| 4730 | { |
| 4731 | if constexpr (__detail::__all_random_access<_Const, _Vs...>) |
| 4732 | return random_access_iterator_tag{}; |
| 4733 | else if constexpr (__detail::__all_bidirectional<_Const, _Vs...>) |
| 4734 | return bidirectional_iterator_tag{}; |
| 4735 | else if constexpr (__detail::__all_forward<_Const, _Vs...>) |
| 4736 | return forward_iterator_tag{}; |
| 4737 | else |
| 4738 | return input_iterator_tag{}; |
| 4739 | } |
| 4740 | |
| 4741 | #ifndef __clang__ // LLVM-61763 workaround |
| 4742 | template<move_constructible _Fp, input_range... _Ws> |
| 4743 | requires (view<_Ws> && ...) && (sizeof...(_Ws) > 0) && is_object_v<_Fp> |
| 4744 | && regular_invocable<_Fp&, range_reference_t<_Ws>...> |
| 4745 | && std::__detail::__can_reference<invoke_result_t<_Fp&, range_reference_t<_Ws>...>> |
| 4746 | friend class zip_transform_view; |
| 4747 | #endif |
| 4748 | |
| 4749 | public: |
| 4750 | // iterator_category defined in __zip_view_iter_cat |
| 4751 | using iterator_concept = decltype(_S_iter_concept()); |
| 4752 | using value_type |
| 4753 | = tuple<range_value_t<__detail::__maybe_const_t<_Const, _Vs>>...>; |
| 4754 | using difference_type |
| 4755 | = common_type_t<range_difference_t<__detail::__maybe_const_t<_Const, _Vs>>...>; |
| 4756 | |
| 4757 | _Iterator() = default; |
| 4758 | |
| 4759 | constexpr |
| 4760 | _Iterator(_Iterator<!_Const> __i) |
| 4761 | requires _Const |
| 4762 | && (convertible_to<iterator_t<_Vs>, |
| 4763 | iterator_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 4764 | : _M_current(std::move(__i._M_current)) |
| 4765 | { } |
| 4766 | |
| 4767 | constexpr auto |
| 4768 | operator*() const |
| 4769 | { |
| 4770 | auto __f = [](auto& __i) -> decltype(auto) { |
| 4771 | return *__i; |
| 4772 | }; |
| 4773 | return __detail::__tuple_transform(__f, _M_current); |
| 4774 | } |
| 4775 | |
| 4776 | constexpr _Iterator& |
| 4777 | operator++() |
| 4778 | { |
| 4779 | __detail::__tuple_for_each([](auto& __i) { ++__i; }, _M_current); |
| 4780 | return *this; |
| 4781 | } |
| 4782 | |
| 4783 | constexpr void |
| 4784 | operator++(int) |
| 4785 | { ++*this; } |
| 4786 | |
| 4787 | constexpr _Iterator |
| 4788 | operator++(int) |
| 4789 | requires __detail::__all_forward<_Const, _Vs...> |
| 4790 | { |
| 4791 | auto __tmp = *this; |
| 4792 | ++*this; |
| 4793 | return __tmp; |
| 4794 | } |
| 4795 | |
| 4796 | constexpr _Iterator& |
| 4797 | operator--() |
| 4798 | requires __detail::__all_bidirectional<_Const, _Vs...> |
| 4799 | { |
| 4800 | __detail::__tuple_for_each([](auto& __i) { --__i; }, _M_current); |
| 4801 | return *this; |
| 4802 | } |
| 4803 | |
| 4804 | constexpr _Iterator |
| 4805 | operator--(int) |
| 4806 | requires __detail::__all_bidirectional<_Const, _Vs...> |
| 4807 | { |
| 4808 | auto __tmp = *this; |
| 4809 | --*this; |
| 4810 | return __tmp; |
| 4811 | } |
| 4812 | |
| 4813 | constexpr _Iterator& |
| 4814 | operator+=(difference_type __x) |
| 4815 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4816 | { |
| 4817 | auto __f = [&]<typename _It>(_It& __i) { |
| 4818 | __i += iter_difference_t<_It>(__x); |
| 4819 | }; |
| 4820 | __detail::__tuple_for_each(__f, _M_current); |
| 4821 | return *this; |
| 4822 | } |
| 4823 | |
| 4824 | constexpr _Iterator& |
| 4825 | operator-=(difference_type __x) |
| 4826 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4827 | { |
| 4828 | auto __f = [&]<typename _It>(_It& __i) { |
| 4829 | __i -= iter_difference_t<_It>(__x); |
| 4830 | }; |
| 4831 | __detail::__tuple_for_each(__f, _M_current); |
| 4832 | return *this; |
| 4833 | } |
| 4834 | |
| 4835 | constexpr auto |
| 4836 | operator[](difference_type __n) const |
| 4837 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4838 | { |
| 4839 | auto __f = [&]<typename _It>(_It& __i) -> decltype(auto) { |
| 4840 | return __i[iter_difference_t<_It>(__n)]; |
| 4841 | }; |
| 4842 | return __detail::__tuple_transform(__f, _M_current); |
| 4843 | } |
| 4844 | |
| 4845 | friend constexpr bool |
| 4846 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 4847 | requires (equality_comparable<iterator_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 4848 | { |
| 4849 | if constexpr (__detail::__all_bidirectional<_Const, _Vs...>) |
| 4850 | return __x._M_current == __y._M_current; |
| 4851 | else |
| 4852 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 4853 | return ((std::get<_Is>(__x._M_current) == std::get<_Is>(__y._M_current)) || ...); |
| 4854 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 4855 | } |
| 4856 | |
| 4857 | friend constexpr auto |
| 4858 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 4859 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4860 | { return __x._M_current <=> __y._M_current; } |
| 4861 | |
| 4862 | friend constexpr _Iterator |
| 4863 | operator+(const _Iterator& __i, difference_type __n) |
| 4864 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4865 | { |
| 4866 | auto __r = __i; |
| 4867 | __r += __n; |
| 4868 | return __r; |
| 4869 | } |
| 4870 | |
| 4871 | friend constexpr _Iterator |
| 4872 | operator+(difference_type __n, const _Iterator& __i) |
| 4873 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4874 | { |
| 4875 | auto __r = __i; |
| 4876 | __r += __n; |
| 4877 | return __r; |
| 4878 | } |
| 4879 | |
| 4880 | friend constexpr _Iterator |
| 4881 | operator-(const _Iterator& __i, difference_type __n) |
| 4882 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4883 | { |
| 4884 | auto __r = __i; |
| 4885 | __r -= __n; |
| 4886 | return __r; |
| 4887 | } |
| 4888 | |
| 4889 | friend constexpr difference_type |
| 4890 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 4891 | requires (sized_sentinel_for<iterator_t<__detail::__maybe_const_t<_Const, _Vs>>, |
| 4892 | iterator_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 4893 | { |
| 4894 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 4895 | return ranges::min({difference_type(std::get<_Is>(__x._M_current) |
| 4896 | - std::get<_Is>(__y._M_current))...}, |
| 4897 | ranges::less{}, |
| 4898 | [](difference_type __i) { |
| 4899 | return __detail::__to_unsigned_like(__i < 0 ? -__i : __i); |
| 4900 | }); |
| 4901 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 4902 | } |
| 4903 | |
| 4904 | friend constexpr auto |
| 4905 | iter_move(const _Iterator& __i) |
| 4906 | { return __detail::__tuple_transform(ranges::iter_move, __i._M_current); } |
| 4907 | |
| 4908 | friend constexpr void |
| 4909 | iter_swap(const _Iterator& __l, const _Iterator& __r) |
| 4910 | requires (indirectly_swappable<iterator_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 4911 | { |
| 4912 | [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 4913 | (ranges::iter_swap(std::get<_Is>(__l._M_current), std::get<_Is>(__r._M_current)), ...); |
| 4914 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 4915 | } |
| 4916 | |
| 4917 | friend class zip_view; |
| 4918 | }; |
| 4919 | |
| 4920 | template<input_range... _Vs> |
| 4921 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) |
| 4922 | template<bool _Const> |
| 4923 | class zip_view<_Vs...>::_Sentinel |
| 4924 | { |
| 4925 | tuple<sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>...> _M_end; |
| 4926 | |
| 4927 | constexpr explicit |
| 4928 | _Sentinel(decltype(_M_end) __end) |
| 4929 | : _M_end(__end) |
| 4930 | { } |
| 4931 | |
| 4932 | friend class zip_view; |
| 4933 | |
| 4934 | public: |
| 4935 | _Sentinel() = default; |
| 4936 | |
| 4937 | constexpr |
| 4938 | _Sentinel(_Sentinel<!_Const> __i) |
| 4939 | requires _Const |
| 4940 | && (convertible_to<sentinel_t<_Vs>, |
| 4941 | sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 4942 | : _M_end(std::move(__i._M_end)) |
| 4943 | { } |
| 4944 | |
| 4945 | template<bool _OtherConst> |
| 4946 | requires (sentinel_for<sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>, |
| 4947 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vs>>> && ...) |
| 4948 | friend constexpr bool |
| 4949 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 4950 | { |
| 4951 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 4952 | return ((std::get<_Is>(__x._M_current) == std::get<_Is>(__y._M_end)) || ...); |
| 4953 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 4954 | } |
| 4955 | |
| 4956 | template<bool _OtherConst> |
| 4957 | requires (sized_sentinel_for<sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>, |
| 4958 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vs>>> && ...) |
| 4959 | friend constexpr auto |
| 4960 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 4961 | { |
| 4962 | using _Ret |
| 4963 | = common_type_t<range_difference_t<__detail::__maybe_const_t<_OtherConst, _Vs>>...>; |
| 4964 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 4965 | return ranges::min({_Ret(std::get<_Is>(__x._M_current) - std::get<_Is>(__y._M_end))...}, |
| 4966 | ranges::less{}, |
| 4967 | [](_Ret __i) { |
| 4968 | return __detail::__to_unsigned_like(__i < 0 ? -__i : __i); |
| 4969 | }); |
| 4970 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 4971 | } |
| 4972 | |
| 4973 | template<bool _OtherConst> |
| 4974 | requires (sized_sentinel_for<sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>, |
| 4975 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vs>>> && ...) |
| 4976 | friend constexpr auto |
| 4977 | operator-(const _Sentinel& __y, const _Iterator<_OtherConst>& __x) |
| 4978 | { return -(__x - __y); } |
| 4979 | }; |
| 4980 | |
| 4981 | namespace views |
| 4982 | { |
| 4983 | namespace __detail |
| 4984 | { |
| 4985 | template<typename... _Ts> |
| 4986 | concept __can_zip_view |
| 4987 | = requires { zip_view<all_t<_Ts>...>(std::declval<_Ts>()...); }; |
| 4988 | } |
| 4989 | |
| 4990 | struct _Zip |
| 4991 | { |
| 4992 | template<typename... _Ts> |
| 4993 | requires (sizeof...(_Ts) == 0 || __detail::__can_zip_view<_Ts...>) |
| 4994 | constexpr auto |
| 4995 | operator() [[nodiscard]] (_Ts&&... __ts) const |
| 4996 | { |
| 4997 | if constexpr (sizeof...(_Ts) == 0) |
| 4998 | return views::empty<tuple<>>; |
| 4999 | else |
| 5000 | return zip_view<all_t<_Ts>...>(std::forward<_Ts>(__ts)...); |
| 5001 | } |
| 5002 | }; |
| 5003 | |
| 5004 | inline constexpr _Zip zip; |
| 5005 | } |
| 5006 | |
| 5007 | namespace __detail |
| 5008 | { |
| 5009 | template<typename _Range, bool _Const> |
| 5010 | using __range_iter_cat |
| 5011 | = typename iterator_traits<iterator_t<__maybe_const_t<_Const, _Range>>>::iterator_category; |
| 5012 | } |
| 5013 | |
| 5014 | template<move_constructible _Fp, input_range... _Vs> |
| 5015 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) && is_object_v<_Fp> |
| 5016 | && regular_invocable<_Fp&, range_reference_t<_Vs>...> |
| 5017 | && std::__detail::__can_reference<invoke_result_t<_Fp&, range_reference_t<_Vs>...>> |
| 5018 | class zip_transform_view : public view_interface<zip_transform_view<_Fp, _Vs...>> |
| 5019 | { |
| 5020 | [[no_unique_address]] __detail::__box<_Fp> _M_fun; |
| 5021 | zip_view<_Vs...> _M_zip; |
| 5022 | |
| 5023 | using _InnerView = zip_view<_Vs...>; |
| 5024 | |
| 5025 | template<bool _Const> |
| 5026 | using __ziperator = iterator_t<__detail::__maybe_const_t<_Const, _InnerView>>; |
| 5027 | |
| 5028 | template<bool _Const> |
| 5029 | using __zentinel = sentinel_t<__detail::__maybe_const_t<_Const, _InnerView>>; |
| 5030 | |
| 5031 | template<bool _Const> |
| 5032 | using _Base = __detail::__maybe_const_t<_Const, _InnerView>; |
| 5033 | |
| 5034 | template<bool _Const> |
| 5035 | struct __iter_cat |
| 5036 | { }; |
| 5037 | |
| 5038 | template<bool _Const> |
| 5039 | requires forward_range<_Base<_Const>> |
| 5040 | struct __iter_cat<_Const> |
| 5041 | { |
| 5042 | private: |
| 5043 | static auto |
| 5044 | _S_iter_cat() |
| 5045 | { |
| 5046 | using __detail::__maybe_const_t; |
| 5047 | using __detail::__range_iter_cat; |
| 5048 | using _Res = invoke_result_t<__maybe_const_t<_Const, _Fp>&, |
| 5049 | range_reference_t<__maybe_const_t<_Const, _Vs>>...>; |
| 5050 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 5051 | // 3798. Rvalue reference and iterator_category |
| 5052 | if constexpr (!is_reference_v<_Res>) |
| 5053 | return input_iterator_tag{}; |
| 5054 | else if constexpr ((derived_from<__range_iter_cat<_Vs, _Const>, |
| 5055 | random_access_iterator_tag> && ...)) |
| 5056 | return random_access_iterator_tag{}; |
| 5057 | else if constexpr ((derived_from<__range_iter_cat<_Vs, _Const>, |
| 5058 | bidirectional_iterator_tag> && ...)) |
| 5059 | return bidirectional_iterator_tag{}; |
| 5060 | else if constexpr ((derived_from<__range_iter_cat<_Vs, _Const>, |
| 5061 | forward_iterator_tag> && ...)) |
| 5062 | return forward_iterator_tag{}; |
| 5063 | else |
| 5064 | return input_iterator_tag{}; |
| 5065 | } |
| 5066 | public: |
| 5067 | using iterator_category = decltype(_S_iter_cat()); |
| 5068 | }; |
| 5069 | |
| 5070 | template<bool> class _Iterator; |
| 5071 | template<bool> class _Sentinel; |
| 5072 | |
| 5073 | public: |
| 5074 | zip_transform_view() = default; |
| 5075 | |
| 5076 | constexpr explicit |
| 5077 | zip_transform_view(_Fp __fun, _Vs... __views) |
| 5078 | : _M_fun(std::move(__fun)), _M_zip(std::move(__views)...) |
| 5079 | { } |
| 5080 | |
| 5081 | constexpr auto |
| 5082 | begin() |
| 5083 | { return _Iterator<false>(*this, _M_zip.begin()); } |
| 5084 | |
| 5085 | constexpr auto |
| 5086 | begin() const |
| 5087 | requires range<const _InnerView> |
| 5088 | && regular_invocable<const _Fp&, range_reference_t<const _Vs>...> |
| 5089 | { return _Iterator<true>(*this, _M_zip.begin()); } |
| 5090 | |
| 5091 | constexpr auto |
| 5092 | end() |
| 5093 | { |
| 5094 | if constexpr (common_range<_InnerView>) |
| 5095 | return _Iterator<false>(*this, _M_zip.end()); |
| 5096 | else |
| 5097 | return _Sentinel<false>(_M_zip.end()); |
| 5098 | } |
| 5099 | |
| 5100 | constexpr auto |
| 5101 | end() const |
| 5102 | requires range<const _InnerView> |
| 5103 | && regular_invocable<const _Fp&, range_reference_t<const _Vs>...> |
| 5104 | { |
| 5105 | if constexpr (common_range<const _InnerView>) |
| 5106 | return _Iterator<true>(*this, _M_zip.end()); |
| 5107 | else |
| 5108 | return _Sentinel<true>(_M_zip.end()); |
| 5109 | } |
| 5110 | |
| 5111 | constexpr auto |
| 5112 | size() requires sized_range<_InnerView> |
| 5113 | { return _M_zip.size(); } |
| 5114 | |
| 5115 | constexpr auto |
| 5116 | size() const requires sized_range<const _InnerView> |
| 5117 | { return _M_zip.size(); } |
| 5118 | }; |
| 5119 | |
| 5120 | template<class _Fp, class... Rs> |
| 5121 | zip_transform_view(_Fp, Rs&&...) -> zip_transform_view<_Fp, views::all_t<Rs>...>; |
| 5122 | |
| 5123 | template<move_constructible _Fp, input_range... _Vs> |
| 5124 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) && is_object_v<_Fp> |
| 5125 | && regular_invocable<_Fp&, range_reference_t<_Vs>...> |
| 5126 | && std::__detail::__can_reference<invoke_result_t<_Fp&, range_reference_t<_Vs>...>> |
| 5127 | template<bool _Const> |
| 5128 | class zip_transform_view<_Fp, _Vs...>::_Iterator : public __iter_cat<_Const> |
| 5129 | { |
| 5130 | using _Parent = __detail::__maybe_const_t<_Const, zip_transform_view>; |
| 5131 | |
| 5132 | _Parent* _M_parent = nullptr; |
| 5133 | __ziperator<_Const> _M_inner; |
| 5134 | |
| 5135 | constexpr |
| 5136 | _Iterator(_Parent& __parent, __ziperator<_Const> __inner) |
| 5137 | : _M_parent(std::__addressof(__parent)), _M_inner(std::move(__inner)) |
| 5138 | { } |
| 5139 | |
| 5140 | friend class zip_transform_view; |
| 5141 | |
| 5142 | public: |
| 5143 | // iterator_category defined in zip_transform_view::__iter_cat |
| 5144 | using iterator_concept = typename __ziperator<_Const>::iterator_concept; |
| 5145 | using value_type |
| 5146 | = remove_cvref_t<invoke_result_t<__detail::__maybe_const_t<_Const, _Fp>&, |
| 5147 | range_reference_t<__detail::__maybe_const_t<_Const, _Vs>>...>>; |
| 5148 | using difference_type = range_difference_t<_Base<_Const>>; |
| 5149 | |
| 5150 | _Iterator() = default; |
| 5151 | |
| 5152 | constexpr |
| 5153 | _Iterator(_Iterator<!_Const> __i) |
| 5154 | requires _Const && convertible_to<__ziperator<false>, __ziperator<_Const>> |
| 5155 | : _M_parent(__i._M_parent), _M_inner(std::move(__i._M_inner)) |
| 5156 | { } |
| 5157 | |
| 5158 | constexpr decltype(auto) |
| 5159 | operator*() const |
| 5160 | { |
| 5161 | return std::apply([&](const auto&... __iters) -> decltype(auto) { |
| 5162 | return std::__invoke(*_M_parent->_M_fun, *__iters...); |
| 5163 | }, _M_inner._M_current); |
| 5164 | } |
| 5165 | |
| 5166 | constexpr _Iterator& |
| 5167 | operator++() |
| 5168 | { |
| 5169 | ++_M_inner; |
| 5170 | return *this; |
| 5171 | } |
| 5172 | |
| 5173 | constexpr void |
| 5174 | operator++(int) |
| 5175 | { ++*this; } |
| 5176 | |
| 5177 | constexpr _Iterator |
| 5178 | operator++(int) requires forward_range<_Base<_Const>> |
| 5179 | { |
| 5180 | auto __tmp = *this; |
| 5181 | ++*this; |
| 5182 | return __tmp; |
| 5183 | } |
| 5184 | |
| 5185 | constexpr _Iterator& |
| 5186 | operator--() requires bidirectional_range<_Base<_Const>> |
| 5187 | { |
| 5188 | --_M_inner; |
| 5189 | return *this; |
| 5190 | } |
| 5191 | |
| 5192 | constexpr _Iterator |
| 5193 | operator--(int) requires bidirectional_range<_Base<_Const>> |
| 5194 | { |
| 5195 | auto __tmp = *this; |
| 5196 | --*this; |
| 5197 | return __tmp; |
| 5198 | } |
| 5199 | |
| 5200 | constexpr _Iterator& |
| 5201 | operator+=(difference_type __x) requires random_access_range<_Base<_Const>> |
| 5202 | { |
| 5203 | _M_inner += __x; |
| 5204 | return *this; |
| 5205 | } |
| 5206 | |
| 5207 | constexpr _Iterator& |
| 5208 | operator-=(difference_type __x) requires random_access_range<_Base<_Const>> |
| 5209 | { |
| 5210 | _M_inner -= __x; |
| 5211 | return *this; |
| 5212 | } |
| 5213 | |
| 5214 | constexpr decltype(auto) |
| 5215 | operator[](difference_type __n) const requires random_access_range<_Base<_Const>> |
| 5216 | { |
| 5217 | return std::apply([&]<typename... _Is>(const _Is&... __iters) -> decltype(auto) { |
| 5218 | return std::__invoke(*_M_parent->_M_fun, __iters[iter_difference_t<_Is>(__n)]...); |
| 5219 | }, _M_inner._M_current); |
| 5220 | } |
| 5221 | |
| 5222 | friend constexpr bool |
| 5223 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 5224 | requires equality_comparable<__ziperator<_Const>> |
| 5225 | { return __x._M_inner == __y._M_inner; } |
| 5226 | |
| 5227 | friend constexpr auto |
| 5228 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 5229 | requires random_access_range<_Base<_Const>> |
| 5230 | { return __x._M_inner <=> __y._M_inner; } |
| 5231 | |
| 5232 | friend constexpr _Iterator |
| 5233 | operator+(const _Iterator& __i, difference_type __n) |
| 5234 | requires random_access_range<_Base<_Const>> |
| 5235 | { return _Iterator(*__i._M_parent, __i._M_inner + __n); } |
| 5236 | |
| 5237 | friend constexpr _Iterator |
| 5238 | operator+(difference_type __n, const _Iterator& __i) |
| 5239 | requires random_access_range<_Base<_Const>> |
| 5240 | { return _Iterator(*__i._M_parent, __i._M_inner + __n); } |
| 5241 | |
| 5242 | friend constexpr _Iterator |
| 5243 | operator-(const _Iterator& __i, difference_type __n) |
| 5244 | requires random_access_range<_Base<_Const>> |
| 5245 | { return _Iterator(*__i._M_parent, __i._M_inner - __n); } |
| 5246 | |
| 5247 | friend constexpr difference_type |
| 5248 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 5249 | requires sized_sentinel_for<__ziperator<_Const>, __ziperator<_Const>> |
| 5250 | { return __x._M_inner - __y._M_inner; } |
| 5251 | }; |
| 5252 | |
| 5253 | template<move_constructible _Fp, input_range... _Vs> |
| 5254 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) && is_object_v<_Fp> |
| 5255 | && regular_invocable<_Fp&, range_reference_t<_Vs>...> |
| 5256 | && std::__detail::__can_reference<invoke_result_t<_Fp&, range_reference_t<_Vs>...>> |
| 5257 | template<bool _Const> |
| 5258 | class zip_transform_view<_Fp, _Vs...>::_Sentinel |
| 5259 | { |
| 5260 | __zentinel<_Const> _M_inner; |
| 5261 | |
| 5262 | constexpr explicit |
| 5263 | _Sentinel(__zentinel<_Const> __inner) |
| 5264 | : _M_inner(__inner) |
| 5265 | { } |
| 5266 | |
| 5267 | friend class zip_transform_view; |
| 5268 | |
| 5269 | public: |
| 5270 | _Sentinel() = default; |
| 5271 | |
| 5272 | constexpr |
| 5273 | _Sentinel(_Sentinel<!_Const> __i) |
| 5274 | requires _Const && convertible_to<__zentinel<false>, __zentinel<_Const>> |
| 5275 | : _M_inner(std::move(__i._M_inner)) |
| 5276 | { } |
| 5277 | |
| 5278 | template<bool _OtherConst> |
| 5279 | requires sentinel_for<__zentinel<_Const>, __ziperator<_OtherConst>> |
| 5280 | friend constexpr bool |
| 5281 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5282 | { return __x._M_inner == __y._M_inner; } |
| 5283 | |
| 5284 | template<bool _OtherConst> |
| 5285 | requires sized_sentinel_for<__zentinel<_Const>, __ziperator<_OtherConst>> |
| 5286 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _InnerView>> |
| 5287 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5288 | { return __x._M_inner - __y._M_inner; } |
| 5289 | |
| 5290 | template<bool _OtherConst> |
| 5291 | requires sized_sentinel_for<__zentinel<_Const>, __ziperator<_OtherConst>> |
| 5292 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _InnerView>> |
| 5293 | operator-(const _Sentinel& __x, const _Iterator<_OtherConst>& __y) |
| 5294 | { return __x._M_inner - __y._M_inner; } |
| 5295 | }; |
| 5296 | |
| 5297 | namespace views |
| 5298 | { |
| 5299 | namespace __detail |
| 5300 | { |
| 5301 | template<typename _Fp, typename... _Ts> |
| 5302 | concept __can_zip_transform_view |
| 5303 | = requires { zip_transform_view(std::declval<_Fp>(), std::declval<_Ts>()...); }; |
| 5304 | } |
| 5305 | |
| 5306 | struct _ZipTransform |
| 5307 | { |
| 5308 | template<typename _Fp, typename... _Ts> |
| 5309 | requires (sizeof...(_Ts) == 0) || __detail::__can_zip_transform_view<_Fp, _Ts...> |
| 5310 | constexpr auto |
| 5311 | operator() [[nodiscard]] (_Fp&& __f, _Ts&&... __ts) const |
| 5312 | { |
| 5313 | if constexpr (sizeof...(_Ts) == 0) |
| 5314 | return views::empty<decay_t<invoke_result_t<decay_t<_Fp>&>>>; |
| 5315 | else |
| 5316 | return zip_transform_view(std::forward<_Fp>(__f), std::forward<_Ts>(__ts)...); |
| 5317 | } |
| 5318 | }; |
| 5319 | |
| 5320 | inline constexpr _ZipTransform zip_transform; |
| 5321 | } |
| 5322 | |
| 5323 | template<forward_range _Vp, size_t _Nm> |
| 5324 | requires view<_Vp> && (_Nm > 0) |
| 5325 | class adjacent_view : public view_interface<adjacent_view<_Vp, _Nm>> |
| 5326 | { |
| 5327 | _Vp _M_base = _Vp(); |
| 5328 | |
| 5329 | template<bool> class _Iterator; |
| 5330 | template<bool> class _Sentinel; |
| 5331 | |
| 5332 | struct __as_sentinel |
| 5333 | { }; |
| 5334 | |
| 5335 | public: |
| 5336 | adjacent_view() requires default_initializable<_Vp> = default; |
| 5337 | |
| 5338 | constexpr explicit |
| 5339 | adjacent_view(_Vp __base) |
| 5340 | : _M_base(std::move(__base)) |
| 5341 | { } |
| 5342 | |
| 5343 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 5344 | // 3848. adjacent_view, adjacent_transform_view and slide_view missing base accessor |
| 5345 | constexpr _Vp |
| 5346 | base() const & requires copy_constructible<_Vp> |
| 5347 | { return _M_base; } |
| 5348 | |
| 5349 | constexpr _Vp |
| 5350 | base() && |
| 5351 | { return std::move(_M_base); } |
| 5352 | |
| 5353 | constexpr auto |
| 5354 | begin() requires (!__detail::__simple_view<_Vp>) |
| 5355 | { return _Iterator<false>(ranges::begin(_M_base), ranges::end(_M_base)); } |
| 5356 | |
| 5357 | constexpr auto |
| 5358 | begin() const requires range<const _Vp> |
| 5359 | { return _Iterator<true>(ranges::begin(_M_base), ranges::end(_M_base)); } |
| 5360 | |
| 5361 | constexpr auto |
| 5362 | end() requires (!__detail::__simple_view<_Vp>) |
| 5363 | { |
| 5364 | if constexpr (common_range<_Vp>) |
| 5365 | return _Iterator<false>(__as_sentinel{}, ranges::begin(_M_base), ranges::end(_M_base)); |
| 5366 | else |
| 5367 | return _Sentinel<false>(ranges::end(_M_base)); |
| 5368 | } |
| 5369 | |
| 5370 | constexpr auto |
| 5371 | end() const requires range<const _Vp> |
| 5372 | { |
| 5373 | if constexpr (common_range<const _Vp>) |
| 5374 | return _Iterator<true>(__as_sentinel{}, ranges::begin(_M_base), ranges::end(_M_base)); |
| 5375 | else |
| 5376 | return _Sentinel<true>(ranges::end(_M_base)); |
| 5377 | } |
| 5378 | |
| 5379 | constexpr auto |
| 5380 | size() requires sized_range<_Vp> |
| 5381 | { |
| 5382 | using _ST = decltype(ranges::size(_M_base)); |
| 5383 | using _CT = common_type_t<_ST, size_t>; |
| 5384 | auto __sz = static_cast<_CT>(ranges::size(_M_base)); |
| 5385 | __sz -= std::min<_CT>(__sz, _Nm - 1); |
| 5386 | return static_cast<_ST>(__sz); |
| 5387 | } |
| 5388 | |
| 5389 | constexpr auto |
| 5390 | size() const requires sized_range<const _Vp> |
| 5391 | { |
| 5392 | using _ST = decltype(ranges::size(_M_base)); |
| 5393 | using _CT = common_type_t<_ST, size_t>; |
| 5394 | auto __sz = static_cast<_CT>(ranges::size(_M_base)); |
| 5395 | __sz -= std::min<_CT>(__sz, _Nm - 1); |
| 5396 | return static_cast<_ST>(__sz); |
| 5397 | } |
| 5398 | }; |
| 5399 | |
| 5400 | template<typename _Vp, size_t _Nm> |
| 5401 | inline constexpr bool enable_borrowed_range<adjacent_view<_Vp, _Nm>> |
| 5402 | = enable_borrowed_range<_Vp>; |
| 5403 | |
| 5404 | namespace __detail |
| 5405 | { |
| 5406 | // Yields tuple<_Tp, ..., _Tp> with _Nm elements. |
| 5407 | template<typename _Tp, size_t _Nm> |
| 5408 | using __repeated_tuple = decltype(std::tuple_cat(std::declval<array<_Tp, _Nm>>())); |
| 5409 | |
| 5410 | // For a functor F that is callable with N arguments, the expression |
| 5411 | // declval<__unarize<F, N>>(x) is equivalent to declval<F>(x, ..., x). |
| 5412 | template<typename _Fp, size_t _Nm> |
| 5413 | struct __unarize |
| 5414 | { |
| 5415 | template<typename... _Ts> |
| 5416 | static invoke_result_t<_Fp, _Ts...> |
| 5417 | __tuple_apply(const tuple<_Ts...>&); // not defined |
| 5418 | |
| 5419 | template<typename _Tp> |
| 5420 | decltype(__tuple_apply(std::declval<__repeated_tuple<_Tp, _Nm>>())) |
| 5421 | operator()(_Tp&&); // not defined |
| 5422 | }; |
| 5423 | } |
| 5424 | |
| 5425 | template<forward_range _Vp, size_t _Nm> |
| 5426 | requires view<_Vp> && (_Nm > 0) |
| 5427 | template<bool _Const> |
| 5428 | class adjacent_view<_Vp, _Nm>::_Iterator |
| 5429 | { |
| 5430 | #ifdef __clang__ // LLVM-61763 workaround |
| 5431 | public: |
| 5432 | #endif |
| 5433 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 5434 | array<iterator_t<_Base>, _Nm> _M_current = array<iterator_t<_Base>, _Nm>(); |
| 5435 | |
| 5436 | constexpr |
| 5437 | _Iterator(iterator_t<_Base> __first, sentinel_t<_Base> __last) |
| 5438 | { |
| 5439 | for (auto& __i : _M_current) |
| 5440 | { |
| 5441 | __i = __first; |
| 5442 | ranges::advance(__first, 1, __last); |
| 5443 | } |
| 5444 | } |
| 5445 | |
| 5446 | constexpr |
| 5447 | _Iterator(__as_sentinel, iterator_t<_Base> __first, iterator_t<_Base> __last) |
| 5448 | { |
| 5449 | if constexpr (!bidirectional_range<_Base>) |
| 5450 | for (auto& __it : _M_current) |
| 5451 | __it = __last; |
| 5452 | else |
| 5453 | for (size_t __i = 0; __i < _Nm; ++__i) |
| 5454 | { |
| 5455 | _M_current[_Nm - 1 - __i] = __last; |
| 5456 | ranges::advance(__last, -1, __first); |
| 5457 | } |
| 5458 | } |
| 5459 | |
| 5460 | static auto |
| 5461 | _S_iter_concept() |
| 5462 | { |
| 5463 | if constexpr (random_access_range<_Base>) |
| 5464 | return random_access_iterator_tag{}; |
| 5465 | else if constexpr (bidirectional_range<_Base>) |
| 5466 | return bidirectional_iterator_tag{}; |
| 5467 | else |
| 5468 | return forward_iterator_tag{}; |
| 5469 | } |
| 5470 | |
| 5471 | friend class adjacent_view; |
| 5472 | |
| 5473 | #ifndef __clang__ // LLVM-61763 workaround |
| 5474 | template<forward_range _Wp, move_constructible _Fp, size_t _Mm> |
| 5475 | requires view<_Wp> && (_Mm > 0) && is_object_v<_Fp> |
| 5476 | && regular_invocable<__detail::__unarize<_Fp&, _Mm>, range_reference_t<_Wp>> |
| 5477 | && std::__detail::__can_reference<invoke_result_t<__detail::__unarize<_Fp&, _Mm>, |
| 5478 | range_reference_t<_Wp>>> |
| 5479 | friend class adjacent_transform_view; |
| 5480 | #endif |
| 5481 | |
| 5482 | public: |
| 5483 | using iterator_category = input_iterator_tag; |
| 5484 | using iterator_concept = decltype(_S_iter_concept()); |
| 5485 | using value_type = conditional_t<_Nm == 2, |
| 5486 | pair<range_value_t<_Base>, range_value_t<_Base>>, |
| 5487 | __detail::__repeated_tuple<range_value_t<_Base>, _Nm>>; |
| 5488 | using difference_type = range_difference_t<_Base>; |
| 5489 | |
| 5490 | _Iterator() = default; |
| 5491 | |
| 5492 | constexpr |
| 5493 | _Iterator(_Iterator<!_Const> __i) |
| 5494 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 5495 | { |
| 5496 | for (size_t __j = 0; __j < _Nm; ++__j) |
| 5497 | _M_current[__j] = std::move(__i._M_current[__j]); |
| 5498 | } |
| 5499 | |
| 5500 | constexpr auto |
| 5501 | operator*() const |
| 5502 | { |
| 5503 | auto __f = [](auto& __i) -> decltype(auto) { return *__i; }; |
| 5504 | return __detail::__tuple_transform(__f, _M_current); |
| 5505 | } |
| 5506 | |
| 5507 | constexpr _Iterator& |
| 5508 | operator++() |
| 5509 | { |
| 5510 | for (auto& __i : _M_current) |
| 5511 | ++__i; |
| 5512 | return *this; |
| 5513 | } |
| 5514 | |
| 5515 | constexpr _Iterator |
| 5516 | operator++(int) |
| 5517 | { |
| 5518 | auto __tmp = *this; |
| 5519 | ++*this; |
| 5520 | return __tmp; |
| 5521 | } |
| 5522 | |
| 5523 | constexpr _Iterator& |
| 5524 | operator--() requires bidirectional_range<_Base> |
| 5525 | { |
| 5526 | for (auto& __i : _M_current) |
| 5527 | --__i; |
| 5528 | return *this; |
| 5529 | } |
| 5530 | |
| 5531 | constexpr _Iterator |
| 5532 | operator--(int) requires bidirectional_range<_Base> |
| 5533 | { |
| 5534 | auto __tmp = *this; |
| 5535 | --*this; |
| 5536 | return __tmp; |
| 5537 | } |
| 5538 | |
| 5539 | constexpr _Iterator& |
| 5540 | operator+=(difference_type __x) |
| 5541 | requires random_access_range<_Base> |
| 5542 | { |
| 5543 | for (auto& __i : _M_current) |
| 5544 | __i += __x; |
| 5545 | return *this; |
| 5546 | } |
| 5547 | |
| 5548 | constexpr _Iterator& |
| 5549 | operator-=(difference_type __x) |
| 5550 | requires random_access_range<_Base> |
| 5551 | { |
| 5552 | for (auto& __i : _M_current) |
| 5553 | __i -= __x; |
| 5554 | return *this; |
| 5555 | } |
| 5556 | |
| 5557 | constexpr auto |
| 5558 | operator[](difference_type __n) const |
| 5559 | requires random_access_range<_Base> |
| 5560 | { |
| 5561 | auto __f = [&](auto& __i) -> decltype(auto) { return __i[__n]; }; |
| 5562 | return __detail::__tuple_transform(__f, _M_current); |
| 5563 | } |
| 5564 | |
| 5565 | friend constexpr bool |
| 5566 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 5567 | { return __x._M_current.back() == __y._M_current.back(); } |
| 5568 | |
| 5569 | friend constexpr bool |
| 5570 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 5571 | requires random_access_range<_Base> |
| 5572 | { return __x._M_current.back() < __y._M_current.back(); } |
| 5573 | |
| 5574 | friend constexpr bool |
| 5575 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 5576 | requires random_access_range<_Base> |
| 5577 | { return __y < __x; } |
| 5578 | |
| 5579 | friend constexpr bool |
| 5580 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 5581 | requires random_access_range<_Base> |
| 5582 | { return !(__y < __x); } |
| 5583 | |
| 5584 | friend constexpr bool |
| 5585 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 5586 | requires random_access_range<_Base> |
| 5587 | { return !(__x < __y); } |
| 5588 | |
| 5589 | friend constexpr auto |
| 5590 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 5591 | requires random_access_range<_Base> |
| 5592 | && three_way_comparable<iterator_t<_Base>> |
| 5593 | { return __x._M_current.back() <=> __y._M_current.back(); } |
| 5594 | |
| 5595 | friend constexpr _Iterator |
| 5596 | operator+(const _Iterator& __i, difference_type __n) |
| 5597 | requires random_access_range<_Base> |
| 5598 | { |
| 5599 | auto __r = __i; |
| 5600 | __r += __n; |
| 5601 | return __r; |
| 5602 | } |
| 5603 | |
| 5604 | friend constexpr _Iterator |
| 5605 | operator+(difference_type __n, const _Iterator& __i) |
| 5606 | requires random_access_range<_Base> |
| 5607 | { |
| 5608 | auto __r = __i; |
| 5609 | __r += __n; |
| 5610 | return __r; |
| 5611 | } |
| 5612 | |
| 5613 | friend constexpr _Iterator |
| 5614 | operator-(const _Iterator& __i, difference_type __n) |
| 5615 | requires random_access_range<_Base> |
| 5616 | { |
| 5617 | auto __r = __i; |
| 5618 | __r -= __n; |
| 5619 | return __r; |
| 5620 | } |
| 5621 | |
| 5622 | friend constexpr difference_type |
| 5623 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 5624 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 5625 | { return __x._M_current.back() - __y._M_current.back(); } |
| 5626 | |
| 5627 | friend constexpr auto |
| 5628 | iter_move(const _Iterator& __i) |
| 5629 | { return __detail::__tuple_transform(ranges::iter_move, __i._M_current); } |
| 5630 | |
| 5631 | friend constexpr void |
| 5632 | iter_swap(const _Iterator& __l, const _Iterator& __r) |
| 5633 | requires indirectly_swappable<iterator_t<_Base>> |
| 5634 | { |
| 5635 | for (size_t __i = 0; __i < _Nm; __i++) |
| 5636 | ranges::iter_swap(__l._M_current[__i], __r._M_current[__i]); |
| 5637 | } |
| 5638 | }; |
| 5639 | |
| 5640 | template<forward_range _Vp, size_t _Nm> |
| 5641 | requires view<_Vp> && (_Nm > 0) |
| 5642 | template<bool _Const> |
| 5643 | class adjacent_view<_Vp, _Nm>::_Sentinel |
| 5644 | { |
| 5645 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 5646 | |
| 5647 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 5648 | |
| 5649 | constexpr explicit |
| 5650 | _Sentinel(sentinel_t<_Base> __end) |
| 5651 | : _M_end(__end) |
| 5652 | { } |
| 5653 | |
| 5654 | friend class adjacent_view; |
| 5655 | |
| 5656 | public: |
| 5657 | _Sentinel() = default; |
| 5658 | |
| 5659 | constexpr |
| 5660 | _Sentinel(_Sentinel<!_Const> __i) |
| 5661 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 5662 | : _M_end(std::move(__i._M_end)) |
| 5663 | { } |
| 5664 | |
| 5665 | template<bool _OtherConst> |
| 5666 | requires sentinel_for<sentinel_t<_Base>, |
| 5667 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vp>>> |
| 5668 | friend constexpr bool |
| 5669 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5670 | { return __x._M_current.back() == __y._M_end; } |
| 5671 | |
| 5672 | template<bool _OtherConst> |
| 5673 | requires sized_sentinel_for<sentinel_t<_Base>, |
| 5674 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vp>>> |
| 5675 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _Vp>> |
| 5676 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5677 | { return __x._M_current.back() - __y._M_end; } |
| 5678 | |
| 5679 | template<bool _OtherConst> |
| 5680 | requires sized_sentinel_for<sentinel_t<_Base>, |
| 5681 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vp>>> |
| 5682 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _Vp>> |
| 5683 | operator-(const _Sentinel& __y, const _Iterator<_OtherConst>& __x) |
| 5684 | { return __y._M_end - __x._M_current.back(); } |
| 5685 | }; |
| 5686 | |
| 5687 | namespace views |
| 5688 | { |
| 5689 | namespace __detail |
| 5690 | { |
| 5691 | template<size_t _Nm, typename _Range> |
| 5692 | concept __can_adjacent_view |
| 5693 | = requires { adjacent_view<all_t<_Range>, _Nm>(std::declval<_Range>()); }; |
| 5694 | } |
| 5695 | |
| 5696 | template<size_t _Nm> |
| 5697 | struct _Adjacent : __adaptor::_RangeAdaptorClosure<_Adjacent<_Nm>> |
| 5698 | { |
| 5699 | template<viewable_range _Range> |
| 5700 | requires (_Nm == 0) || __detail::__can_adjacent_view<_Nm, _Range> |
| 5701 | constexpr auto |
| 5702 | operator() [[nodiscard]] (_Range&& __r) const |
| 5703 | { |
| 5704 | if constexpr (_Nm == 0) |
| 5705 | return views::empty<tuple<>>; |
| 5706 | else |
| 5707 | return adjacent_view<all_t<_Range>, _Nm>(std::forward<_Range>(__r)); |
| 5708 | } |
| 5709 | }; |
| 5710 | |
| 5711 | template<size_t _Nm> |
| 5712 | inline constexpr _Adjacent<_Nm> adjacent; |
| 5713 | |
| 5714 | inline constexpr auto pairwise = adjacent<2>; |
| 5715 | } |
| 5716 | |
| 5717 | template<forward_range _Vp, move_constructible _Fp, size_t _Nm> |
| 5718 | requires view<_Vp> && (_Nm > 0) && is_object_v<_Fp> |
| 5719 | && regular_invocable<__detail::__unarize<_Fp&, _Nm>, range_reference_t<_Vp>> |
| 5720 | && std::__detail::__can_reference<invoke_result_t<__detail::__unarize<_Fp&, _Nm>, |
| 5721 | range_reference_t<_Vp>>> |
| 5722 | class adjacent_transform_view : public view_interface<adjacent_transform_view<_Vp, _Fp, _Nm>> |
| 5723 | { |
| 5724 | [[no_unique_address]] __detail::__box<_Fp> _M_fun; |
| 5725 | adjacent_view<_Vp, _Nm> _M_inner; |
| 5726 | |
| 5727 | using _InnerView = adjacent_view<_Vp, _Nm>; |
| 5728 | |
| 5729 | template<bool _Const> |
| 5730 | using _InnerIter = iterator_t<__detail::__maybe_const_t<_Const, _InnerView>>; |
| 5731 | |
| 5732 | template<bool _Const> |
| 5733 | using _InnerSent = sentinel_t<__detail::__maybe_const_t<_Const, _InnerView>>; |
| 5734 | |
| 5735 | template<bool> class _Iterator; |
| 5736 | template<bool> class _Sentinel; |
| 5737 | |
| 5738 | public: |
| 5739 | adjacent_transform_view() = default; |
| 5740 | |
| 5741 | constexpr explicit |
| 5742 | adjacent_transform_view(_Vp __base, _Fp __fun) |
| 5743 | : _M_fun(std::move(__fun)), _M_inner(std::move(__base)) |
| 5744 | { } |
| 5745 | |
| 5746 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 5747 | // 3848. adjacent_view, adjacent_transform_view and slide_view missing base accessor |
| 5748 | // 3947. Unexpected constraints on adjacent_transform_view::base() |
| 5749 | constexpr _Vp |
| 5750 | base() const & requires copy_constructible<_Vp> |
| 5751 | { return _M_inner.base(); } |
| 5752 | |
| 5753 | constexpr _Vp |
| 5754 | base() && |
| 5755 | { return std::move(_M_inner.base()); } |
| 5756 | |
| 5757 | constexpr auto |
| 5758 | begin() |
| 5759 | { return _Iterator<false>(*this, _M_inner.begin()); } |
| 5760 | |
| 5761 | constexpr auto |
| 5762 | begin() const |
| 5763 | requires range<const _InnerView> |
| 5764 | && regular_invocable<__detail::__unarize<const _Fp&, _Nm>, |
| 5765 | range_reference_t<const _Vp>> |
| 5766 | { return _Iterator<true>(*this, _M_inner.begin()); } |
| 5767 | |
| 5768 | constexpr auto |
| 5769 | end() |
| 5770 | { |
| 5771 | if constexpr (common_range<_InnerView>) |
| 5772 | return _Iterator<false>(*this, _M_inner.end()); |
| 5773 | else |
| 5774 | return _Sentinel<false>(_M_inner.end()); |
| 5775 | } |
| 5776 | |
| 5777 | constexpr auto |
| 5778 | end() const |
| 5779 | requires range<const _InnerView> |
| 5780 | && regular_invocable<__detail::__unarize<const _Fp&, _Nm>, |
| 5781 | range_reference_t<const _Vp>> |
| 5782 | { |
| 5783 | if constexpr (common_range<const _InnerView>) |
| 5784 | return _Iterator<true>(*this, _M_inner.end()); |
| 5785 | else |
| 5786 | return _Sentinel<true>(_M_inner.end()); |
| 5787 | } |
| 5788 | |
| 5789 | constexpr auto |
| 5790 | size() requires sized_range<_InnerView> |
| 5791 | { return _M_inner.size(); } |
| 5792 | |
| 5793 | constexpr auto |
| 5794 | size() const requires sized_range<const _InnerView> |
| 5795 | { return _M_inner.size(); } |
| 5796 | }; |
| 5797 | |
| 5798 | template<forward_range _Vp, move_constructible _Fp, size_t _Nm> |
| 5799 | requires view<_Vp> && (_Nm > 0) && is_object_v<_Fp> |
| 5800 | && regular_invocable<__detail::__unarize<_Fp&, _Nm>, range_reference_t<_Vp>> |
| 5801 | && std::__detail::__can_reference<invoke_result_t<__detail::__unarize<_Fp&, _Nm>, |
| 5802 | range_reference_t<_Vp>>> |
| 5803 | template<bool _Const> |
| 5804 | class adjacent_transform_view<_Vp, _Fp, _Nm>::_Iterator |
| 5805 | { |
| 5806 | using _Parent = __detail::__maybe_const_t<_Const, adjacent_transform_view>; |
| 5807 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 5808 | |
| 5809 | _Parent* _M_parent = nullptr; |
| 5810 | _InnerIter<_Const> _M_inner; |
| 5811 | |
| 5812 | constexpr |
| 5813 | _Iterator(_Parent& __parent, _InnerIter<_Const> __inner) |
| 5814 | : _M_parent(std::__addressof(__parent)), _M_inner(std::move(__inner)) |
| 5815 | { } |
| 5816 | |
| 5817 | static auto |
| 5818 | _S_iter_cat() |
| 5819 | { |
| 5820 | using __detail::__maybe_const_t; |
| 5821 | using __detail::__unarize; |
| 5822 | using _Res = invoke_result_t<__unarize<__maybe_const_t<_Const, _Fp>&, _Nm>, |
| 5823 | range_reference_t<_Base>>; |
| 5824 | using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 5825 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 5826 | // 3798. Rvalue reference and iterator_category |
| 5827 | if constexpr (!is_reference_v<_Res>) |
| 5828 | return input_iterator_tag{}; |
| 5829 | else if constexpr (derived_from<_Cat, random_access_iterator_tag>) |
| 5830 | return random_access_iterator_tag{}; |
| 5831 | else if constexpr (derived_from<_Cat, bidirectional_iterator_tag>) |
| 5832 | return bidirectional_iterator_tag{}; |
| 5833 | else if constexpr (derived_from<_Cat, forward_iterator_tag>) |
| 5834 | return forward_iterator_tag{}; |
| 5835 | else |
| 5836 | return input_iterator_tag{}; |
| 5837 | } |
| 5838 | |
| 5839 | friend class adjacent_transform_view; |
| 5840 | |
| 5841 | public: |
| 5842 | using iterator_category = decltype(_S_iter_cat()); |
| 5843 | using iterator_concept = typename _InnerIter<_Const>::iterator_concept; |
| 5844 | using value_type |
| 5845 | = remove_cvref_t<invoke_result_t |
| 5846 | <__detail::__unarize<__detail::__maybe_const_t<_Const, _Fp>&, _Nm>, |
| 5847 | range_reference_t<_Base>>>; |
| 5848 | using difference_type = range_difference_t<_Base>; |
| 5849 | |
| 5850 | _Iterator() = default; |
| 5851 | |
| 5852 | constexpr |
| 5853 | _Iterator(_Iterator<!_Const> __i) |
| 5854 | requires _Const && convertible_to<_InnerIter<false>, _InnerIter<_Const>> |
| 5855 | : _M_parent(__i._M_parent), _M_inner(std::move(__i._M_inner)) |
| 5856 | { } |
| 5857 | |
| 5858 | constexpr decltype(auto) |
| 5859 | operator*() const |
| 5860 | { |
| 5861 | return std::apply([&](const auto&... __iters) -> decltype(auto) { |
| 5862 | return std::__invoke(*_M_parent->_M_fun, *__iters...); |
| 5863 | }, _M_inner._M_current); |
| 5864 | } |
| 5865 | |
| 5866 | constexpr _Iterator& |
| 5867 | operator++() |
| 5868 | { |
| 5869 | ++_M_inner; |
| 5870 | return *this; |
| 5871 | } |
| 5872 | |
| 5873 | constexpr _Iterator |
| 5874 | operator++(int) |
| 5875 | { |
| 5876 | auto __tmp = *this; |
| 5877 | ++*this; |
| 5878 | return __tmp; |
| 5879 | } |
| 5880 | |
| 5881 | constexpr _Iterator& |
| 5882 | operator--() requires bidirectional_range<_Base> |
| 5883 | { |
| 5884 | --_M_inner; |
| 5885 | return *this; |
| 5886 | } |
| 5887 | |
| 5888 | constexpr _Iterator |
| 5889 | operator--(int) requires bidirectional_range<_Base> |
| 5890 | { |
| 5891 | auto __tmp = *this; |
| 5892 | --*this; |
| 5893 | return __tmp; |
| 5894 | } |
| 5895 | |
| 5896 | constexpr _Iterator& |
| 5897 | operator+=(difference_type __x) requires random_access_range<_Base> |
| 5898 | { |
| 5899 | _M_inner += __x; |
| 5900 | return *this; |
| 5901 | } |
| 5902 | |
| 5903 | constexpr _Iterator& |
| 5904 | operator-=(difference_type __x) requires random_access_range<_Base> |
| 5905 | { |
| 5906 | _M_inner -= __x; |
| 5907 | return *this; |
| 5908 | } |
| 5909 | |
| 5910 | constexpr decltype(auto) |
| 5911 | operator[](difference_type __n) const requires random_access_range<_Base> |
| 5912 | { |
| 5913 | return std::apply([&](const auto&... __iters) -> decltype(auto) { |
| 5914 | return std::__invoke(*_M_parent->_M_fun, __iters[__n]...); |
| 5915 | }, _M_inner._M_current); |
| 5916 | } |
| 5917 | |
| 5918 | friend constexpr bool |
| 5919 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 5920 | { return __x._M_inner == __y._M_inner; } |
| 5921 | |
| 5922 | friend constexpr bool |
| 5923 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 5924 | requires random_access_range<_Base> |
| 5925 | { return __x._M_inner < __y._M_inner; } |
| 5926 | |
| 5927 | friend constexpr bool |
| 5928 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 5929 | requires random_access_range<_Base> |
| 5930 | { return __x._M_inner > __y._M_inner; } |
| 5931 | |
| 5932 | friend constexpr bool |
| 5933 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 5934 | requires random_access_range<_Base> |
| 5935 | { return __x._M_inner <= __y._M_inner; } |
| 5936 | |
| 5937 | friend constexpr bool |
| 5938 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 5939 | requires random_access_range<_Base> |
| 5940 | { return __x._M_inner >= __y._M_inner; } |
| 5941 | |
| 5942 | friend constexpr auto |
| 5943 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 5944 | requires random_access_range<_Base> && |
| 5945 | three_way_comparable<_InnerIter<_Const>> |
| 5946 | { return __x._M_inner <=> __y._M_inner; } |
| 5947 | |
| 5948 | friend constexpr _Iterator |
| 5949 | operator+(const _Iterator& __i, difference_type __n) |
| 5950 | requires random_access_range<_Base> |
| 5951 | { return _Iterator(*__i._M_parent, __i._M_inner + __n); } |
| 5952 | |
| 5953 | friend constexpr _Iterator |
| 5954 | operator+(difference_type __n, const _Iterator& __i) |
| 5955 | requires random_access_range<_Base> |
| 5956 | { return _Iterator(*__i._M_parent, __i._M_inner + __n); } |
| 5957 | |
| 5958 | friend constexpr _Iterator |
| 5959 | operator-(const _Iterator& __i, difference_type __n) |
| 5960 | requires random_access_range<_Base> |
| 5961 | { return _Iterator(*__i._M_parent, __i._M_inner - __n); } |
| 5962 | |
| 5963 | friend constexpr difference_type |
| 5964 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 5965 | requires sized_sentinel_for<_InnerIter<_Const>, _InnerIter<_Const>> |
| 5966 | { return __x._M_inner - __y._M_inner; } |
| 5967 | }; |
| 5968 | |
| 5969 | template<forward_range _Vp, move_constructible _Fp, size_t _Nm> |
| 5970 | requires view<_Vp> && (_Nm > 0) && is_object_v<_Fp> |
| 5971 | && regular_invocable<__detail::__unarize<_Fp&, _Nm>, range_reference_t<_Vp>> |
| 5972 | && std::__detail::__can_reference<invoke_result_t<__detail::__unarize<_Fp&, _Nm>, |
| 5973 | range_reference_t<_Vp>>> |
| 5974 | template<bool _Const> |
| 5975 | class adjacent_transform_view<_Vp, _Fp, _Nm>::_Sentinel |
| 5976 | { |
| 5977 | _InnerSent<_Const> _M_inner; |
| 5978 | |
| 5979 | constexpr explicit |
| 5980 | _Sentinel(_InnerSent<_Const> __inner) |
| 5981 | : _M_inner(__inner) |
| 5982 | { } |
| 5983 | |
| 5984 | friend class adjacent_transform_view; |
| 5985 | |
| 5986 | public: |
| 5987 | _Sentinel() = default; |
| 5988 | |
| 5989 | constexpr |
| 5990 | _Sentinel(_Sentinel<!_Const> __i) |
| 5991 | requires _Const && convertible_to<_InnerSent<false>, _InnerSent<_Const>> |
| 5992 | : _M_inner(std::move(__i._M_inner)) |
| 5993 | { } |
| 5994 | |
| 5995 | template<bool _OtherConst> |
| 5996 | requires sentinel_for<_InnerSent<_Const>, _InnerIter<_OtherConst>> |
| 5997 | friend constexpr bool |
| 5998 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5999 | { return __x._M_inner == __y._M_inner; } |
| 6000 | |
| 6001 | template<bool _OtherConst> |
| 6002 | requires sized_sentinel_for<_InnerSent<_Const>, _InnerIter<_OtherConst>> |
| 6003 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _InnerView>> |
| 6004 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 6005 | { return __x._M_inner - __y._M_inner; } |
| 6006 | |
| 6007 | template<bool _OtherConst> |
| 6008 | requires sized_sentinel_for<_InnerSent<_Const>, _InnerIter<_OtherConst>> |
| 6009 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _InnerView>> |
| 6010 | operator-(const _Sentinel& __x, const _Iterator<_OtherConst>& __y) |
| 6011 | { return __x._M_inner - __y._M_inner; } |
| 6012 | }; |
| 6013 | |
| 6014 | namespace views |
| 6015 | { |
| 6016 | namespace __detail |
| 6017 | { |
| 6018 | template<size_t _Nm, typename _Range, typename _Fp> |
| 6019 | concept __can_adjacent_transform_view |
| 6020 | = requires { adjacent_transform_view<all_t<_Range>, decay_t<_Fp>, _Nm> |
| 6021 | (std::declval<_Range>(), std::declval<_Fp>()); }; |
| 6022 | } |
| 6023 | |
| 6024 | template<size_t _Nm> |
| 6025 | struct _AdjacentTransform : __adaptor::_RangeAdaptor<_AdjacentTransform<_Nm>> |
| 6026 | { |
| 6027 | template<viewable_range _Range, typename _Fp> |
| 6028 | requires (_Nm == 0) || __detail::__can_adjacent_transform_view<_Nm, _Range, _Fp> |
| 6029 | constexpr auto |
| 6030 | operator() [[nodiscard]] (_Range&& __r, _Fp&& __f) const |
| 6031 | { |
| 6032 | if constexpr (_Nm == 0) |
| 6033 | return zip_transform(std::forward<_Fp>(__f)); |
| 6034 | else |
| 6035 | return adjacent_transform_view<all_t<_Range>, decay_t<_Fp>, _Nm> |
| 6036 | (std::forward<_Range>(__r), std::forward<_Fp>(__f)); |
| 6037 | } |
| 6038 | |
| 6039 | using __adaptor::_RangeAdaptor<_AdjacentTransform>::operator(); |
| 6040 | static constexpr int _S_arity = 2; |
| 6041 | static constexpr bool _S_has_simple_extra_args = true; |
| 6042 | }; |
| 6043 | |
| 6044 | template<size_t _Nm> |
| 6045 | inline constexpr _AdjacentTransform<_Nm> adjacent_transform; |
| 6046 | |
| 6047 | inline constexpr auto pairwise_transform = adjacent_transform<2>; |
| 6048 | } |
| 6049 | #endif // __cpp_lib_ranges_zip |
| 6050 | |
| 6051 | #ifdef __cpp_lib_ranges_chunk // C++ >= 23 |
| 6052 | namespace __detail |
| 6053 | { |
| 6054 | template<typename _Tp> |
| 6055 | constexpr _Tp __div_ceil(_Tp __num, _Tp __denom) |
| 6056 | { |
| 6057 | _Tp __r = __num / __denom; |
| 6058 | if (__num % __denom) |
| 6059 | ++__r; |
| 6060 | return __r; |
| 6061 | } |
| 6062 | } |
| 6063 | |
| 6064 | template<view _Vp> |
| 6065 | requires input_range<_Vp> |
| 6066 | class chunk_view : public view_interface<chunk_view<_Vp>> |
| 6067 | { |
| 6068 | _Vp _M_base; |
| 6069 | range_difference_t<_Vp> _M_n; |
| 6070 | range_difference_t<_Vp> _M_remainder = 0; |
| 6071 | __detail::__non_propagating_cache<iterator_t<_Vp>> _M_current; |
| 6072 | |
| 6073 | class _OuterIter; |
| 6074 | class _InnerIter; |
| 6075 | |
| 6076 | public: |
| 6077 | constexpr explicit |
| 6078 | chunk_view(_Vp __base, range_difference_t<_Vp> __n) |
| 6079 | : _M_base(std::move(__base)), _M_n(__n) |
| 6080 | { __glibcxx_assert(__n >= 0); } |
| 6081 | |
| 6082 | constexpr _Vp |
| 6083 | base() const & requires copy_constructible<_Vp> |
| 6084 | { return _M_base; } |
| 6085 | |
| 6086 | constexpr _Vp |
| 6087 | base() && |
| 6088 | { return std::move(_M_base); } |
| 6089 | |
| 6090 | constexpr _OuterIter |
| 6091 | begin() |
| 6092 | { |
| 6093 | _M_current = ranges::begin(_M_base); |
| 6094 | _M_remainder = _M_n; |
| 6095 | return _OuterIter(*this); |
| 6096 | } |
| 6097 | |
| 6098 | constexpr default_sentinel_t |
| 6099 | end() const noexcept |
| 6100 | { return default_sentinel; } |
| 6101 | |
| 6102 | constexpr auto |
| 6103 | size() requires sized_range<_Vp> |
| 6104 | { |
| 6105 | return __detail::__to_unsigned_like(__detail::__div_ceil |
| 6106 | (ranges::distance(_M_base), _M_n)); |
| 6107 | } |
| 6108 | |
| 6109 | constexpr auto |
| 6110 | size() const requires sized_range<const _Vp> |
| 6111 | { |
| 6112 | return __detail::__to_unsigned_like(__detail::__div_ceil |
| 6113 | (ranges::distance(_M_base), _M_n)); |
| 6114 | } |
| 6115 | }; |
| 6116 | |
| 6117 | template<typename _Range> |
| 6118 | chunk_view(_Range&&, range_difference_t<_Range>) -> chunk_view<views::all_t<_Range>>; |
| 6119 | |
| 6120 | template<view _Vp> |
| 6121 | requires input_range<_Vp> |
| 6122 | class chunk_view<_Vp>::_OuterIter |
| 6123 | { |
| 6124 | chunk_view* _M_parent; |
| 6125 | |
| 6126 | constexpr explicit |
| 6127 | _OuterIter(chunk_view& __parent) noexcept |
| 6128 | : _M_parent(std::__addressof(__parent)) |
| 6129 | { } |
| 6130 | |
| 6131 | friend chunk_view; |
| 6132 | |
| 6133 | public: |
| 6134 | using iterator_concept = input_iterator_tag; |
| 6135 | using difference_type = range_difference_t<_Vp>; |
| 6136 | |
| 6137 | struct value_type; |
| 6138 | |
| 6139 | _OuterIter(_OuterIter&&) = default; |
| 6140 | _OuterIter& operator=(_OuterIter&&) = default; |
| 6141 | |
| 6142 | constexpr value_type |
| 6143 | operator*() const |
| 6144 | { |
| 6145 | __glibcxx_assert(*this != default_sentinel); |
| 6146 | return value_type(*_M_parent); |
| 6147 | } |
| 6148 | |
| 6149 | constexpr _OuterIter& |
| 6150 | operator++() |
| 6151 | { |
| 6152 | __glibcxx_assert(*this != default_sentinel); |
| 6153 | ranges::advance(*_M_parent->_M_current, _M_parent->_M_remainder, |
| 6154 | ranges::end(_M_parent->_M_base)); |
| 6155 | _M_parent->_M_remainder = _M_parent->_M_n; |
| 6156 | return *this; |
| 6157 | } |
| 6158 | |
| 6159 | constexpr void |
| 6160 | operator++(int) |
| 6161 | { ++*this; } |
| 6162 | |
| 6163 | friend constexpr bool |
| 6164 | operator==(const _OuterIter& __x, default_sentinel_t) |
| 6165 | { |
| 6166 | return *__x._M_parent->_M_current == ranges::end(__x._M_parent->_M_base) |
| 6167 | && __x._M_parent->_M_remainder != 0; |
| 6168 | } |
| 6169 | |
| 6170 | friend constexpr difference_type |
| 6171 | operator-(default_sentinel_t, const _OuterIter& __x) |
| 6172 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6173 | { |
| 6174 | const auto __dist = ranges::end(__x._M_parent->_M_base) - *__x._M_parent->_M_current; |
| 6175 | |
| 6176 | if (__dist < __x._M_parent->_M_remainder) |
| 6177 | return __dist == 0 ? 0 : 1; |
| 6178 | |
| 6179 | return 1 + __detail::__div_ceil(__dist - __x._M_parent->_M_remainder, |
| 6180 | __x._M_parent->_M_n); |
| 6181 | } |
| 6182 | |
| 6183 | friend constexpr difference_type |
| 6184 | operator-(const _OuterIter& __x, default_sentinel_t __y) |
| 6185 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6186 | { return -(__y - __x); } |
| 6187 | }; |
| 6188 | |
| 6189 | template<view _Vp> |
| 6190 | requires input_range<_Vp> |
| 6191 | struct chunk_view<_Vp>::_OuterIter::value_type : view_interface<value_type> |
| 6192 | { |
| 6193 | private: |
| 6194 | chunk_view* _M_parent; |
| 6195 | |
| 6196 | constexpr explicit |
| 6197 | value_type(chunk_view& __parent) noexcept |
| 6198 | : _M_parent(std::__addressof(__parent)) |
| 6199 | { } |
| 6200 | |
| 6201 | friend _OuterIter; |
| 6202 | |
| 6203 | public: |
| 6204 | constexpr _InnerIter |
| 6205 | begin() const noexcept |
| 6206 | { return _InnerIter(*_M_parent); } |
| 6207 | |
| 6208 | constexpr default_sentinel_t |
| 6209 | end() const noexcept |
| 6210 | { return default_sentinel; } |
| 6211 | |
| 6212 | constexpr auto |
| 6213 | size() const |
| 6214 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6215 | { |
| 6216 | return __detail::__to_unsigned_like |
| 6217 | (ranges::min(_M_parent->_M_remainder, |
| 6218 | ranges::end(_M_parent->_M_base) - *_M_parent->_M_current)); |
| 6219 | } |
| 6220 | }; |
| 6221 | |
| 6222 | template<view _Vp> |
| 6223 | requires input_range<_Vp> |
| 6224 | class chunk_view<_Vp>::_InnerIter |
| 6225 | { |
| 6226 | chunk_view* _M_parent; |
| 6227 | |
| 6228 | constexpr explicit |
| 6229 | _InnerIter(chunk_view& __parent) noexcept |
| 6230 | : _M_parent(std::__addressof(__parent)) |
| 6231 | { } |
| 6232 | |
| 6233 | friend _OuterIter::value_type; |
| 6234 | |
| 6235 | public: |
| 6236 | using iterator_concept = input_iterator_tag; |
| 6237 | using difference_type = range_difference_t<_Vp>; |
| 6238 | using value_type = range_value_t<_Vp>; |
| 6239 | |
| 6240 | _InnerIter(_InnerIter&&) = default; |
| 6241 | _InnerIter& operator=(_InnerIter&&) = default; |
| 6242 | |
| 6243 | constexpr const iterator_t<_Vp>& |
| 6244 | base() const & |
| 6245 | { return *_M_parent->_M_current; } |
| 6246 | |
| 6247 | constexpr range_reference_t<_Vp> |
| 6248 | operator*() const |
| 6249 | { |
| 6250 | __glibcxx_assert(*this != default_sentinel); |
| 6251 | return **_M_parent->_M_current; |
| 6252 | } |
| 6253 | |
| 6254 | constexpr _InnerIter& |
| 6255 | operator++() |
| 6256 | { |
| 6257 | __glibcxx_assert(*this != default_sentinel); |
| 6258 | ++*_M_parent->_M_current; |
| 6259 | if (*_M_parent->_M_current == ranges::end(_M_parent->_M_base)) |
| 6260 | _M_parent->_M_remainder = 0; |
| 6261 | else |
| 6262 | --_M_parent->_M_remainder; |
| 6263 | return *this; |
| 6264 | } |
| 6265 | |
| 6266 | constexpr void |
| 6267 | operator++(int) |
| 6268 | { ++*this; } |
| 6269 | |
| 6270 | friend constexpr bool |
| 6271 | operator==(const _InnerIter& __x, default_sentinel_t) noexcept |
| 6272 | { return __x._M_parent->_M_remainder == 0; } |
| 6273 | |
| 6274 | friend constexpr difference_type |
| 6275 | operator-(default_sentinel_t, const _InnerIter& __x) |
| 6276 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6277 | { |
| 6278 | return ranges::min(__x._M_parent->_M_remainder, |
| 6279 | ranges::end(__x._M_parent->_M_base) - *__x._M_parent->_M_current); |
| 6280 | } |
| 6281 | |
| 6282 | friend constexpr difference_type |
| 6283 | operator-(const _InnerIter& __x, default_sentinel_t __y) |
| 6284 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6285 | { return -(__y - __x); } |
| 6286 | |
| 6287 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 6288 | // 3851. chunk_view::inner-iterator missing custom iter_move and iter_swap |
| 6289 | friend constexpr range_rvalue_reference_t<_Vp> |
| 6290 | iter_move(const _InnerIter& __i) |
| 6291 | noexcept(noexcept(ranges::iter_move(*__i._M_parent->_M_current))) |
| 6292 | { return ranges::iter_move(*__i._M_parent->_M_current); } |
| 6293 | |
| 6294 | friend constexpr void |
| 6295 | iter_swap(const _InnerIter& __x, const _InnerIter& __y) |
| 6296 | noexcept(noexcept(ranges::iter_swap(*__x._M_parent->_M_current, |
| 6297 | *__x._M_parent->_M_current))) |
| 6298 | requires indirectly_swappable<iterator_t<_Vp>> |
| 6299 | { return ranges::iter_swap(*__x._M_parent->_M_current, *__y._M_parent->_M_current); } |
| 6300 | }; |
| 6301 | |
| 6302 | template<view _Vp> |
| 6303 | requires forward_range<_Vp> |
| 6304 | class chunk_view<_Vp> : public view_interface<chunk_view<_Vp>> |
| 6305 | { |
| 6306 | _Vp _M_base; |
| 6307 | range_difference_t<_Vp> _M_n; |
| 6308 | template<bool> class _Iterator; |
| 6309 | |
| 6310 | public: |
| 6311 | constexpr explicit |
| 6312 | chunk_view(_Vp __base, range_difference_t<_Vp> __n) |
| 6313 | : _M_base(std::move(__base)), _M_n(__n) |
| 6314 | { __glibcxx_assert(__n > 0); } |
| 6315 | |
| 6316 | constexpr _Vp |
| 6317 | base() const & requires copy_constructible<_Vp> |
| 6318 | { return _M_base; } |
| 6319 | |
| 6320 | constexpr _Vp |
| 6321 | base() && |
| 6322 | { return std::move(_M_base); } |
| 6323 | |
| 6324 | constexpr auto |
| 6325 | begin() requires (!__detail::__simple_view<_Vp>) |
| 6326 | { return _Iterator<false>(this, ranges::begin(_M_base)); } |
| 6327 | |
| 6328 | constexpr auto |
| 6329 | begin() const requires forward_range<const _Vp> |
| 6330 | { return _Iterator<true>(this, ranges::begin(_M_base)); } |
| 6331 | |
| 6332 | constexpr auto |
| 6333 | end() requires (!__detail::__simple_view<_Vp>) |
| 6334 | { |
| 6335 | if constexpr (common_range<_Vp> && sized_range<_Vp>) |
| 6336 | { |
| 6337 | auto __missing = (_M_n - ranges::distance(_M_base) % _M_n) % _M_n; |
| 6338 | return _Iterator<false>(this, ranges::end(_M_base), __missing); |
| 6339 | } |
| 6340 | else if constexpr (common_range<_Vp> && !bidirectional_range<_Vp>) |
| 6341 | return _Iterator<false>(this, ranges::end(_M_base)); |
| 6342 | else |
| 6343 | return default_sentinel; |
| 6344 | } |
| 6345 | |
| 6346 | constexpr auto |
| 6347 | end() const requires forward_range<const _Vp> |
| 6348 | { |
| 6349 | if constexpr (common_range<const _Vp> && sized_range<const _Vp>) |
| 6350 | { |
| 6351 | auto __missing = (_M_n - ranges::distance(_M_base) % _M_n) % _M_n; |
| 6352 | return _Iterator<true>(this, ranges::end(_M_base), __missing); |
| 6353 | } |
| 6354 | else if constexpr (common_range<const _Vp> && !bidirectional_range<const _Vp>) |
| 6355 | return _Iterator<true>(this, ranges::end(_M_base)); |
| 6356 | else |
| 6357 | return default_sentinel; |
| 6358 | } |
| 6359 | |
| 6360 | constexpr auto |
| 6361 | size() requires sized_range<_Vp> |
| 6362 | { |
| 6363 | return __detail::__to_unsigned_like(__detail::__div_ceil |
| 6364 | (ranges::distance(_M_base), _M_n)); |
| 6365 | } |
| 6366 | |
| 6367 | constexpr auto |
| 6368 | size() const requires sized_range<const _Vp> |
| 6369 | { |
| 6370 | return __detail::__to_unsigned_like(__detail::__div_ceil |
| 6371 | (ranges::distance(_M_base), _M_n)); |
| 6372 | } |
| 6373 | }; |
| 6374 | |
| 6375 | template<typename _Vp> |
| 6376 | inline constexpr bool enable_borrowed_range<chunk_view<_Vp>> |
| 6377 | = forward_range<_Vp> && enable_borrowed_range<_Vp>; |
| 6378 | |
| 6379 | template<view _Vp> |
| 6380 | requires forward_range<_Vp> |
| 6381 | template<bool _Const> |
| 6382 | class chunk_view<_Vp>::_Iterator |
| 6383 | { |
| 6384 | using _Parent = __detail::__maybe_const_t<_Const, chunk_view>; |
| 6385 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 6386 | |
| 6387 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 6388 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 6389 | range_difference_t<_Base> _M_n = 0; |
| 6390 | range_difference_t<_Base> _M_missing = 0; |
| 6391 | |
| 6392 | constexpr |
| 6393 | _Iterator(_Parent* __parent, iterator_t<_Base> __current, |
| 6394 | range_difference_t<_Base> __missing = 0) |
| 6395 | : _M_current(__current), _M_end(ranges::end(__parent->_M_base)), |
| 6396 | _M_n(__parent->_M_n), _M_missing(__missing) |
| 6397 | { } |
| 6398 | |
| 6399 | static auto |
| 6400 | _S_iter_cat() |
| 6401 | { |
| 6402 | if constexpr (random_access_range<_Base>) |
| 6403 | return random_access_iterator_tag{}; |
| 6404 | else if constexpr (bidirectional_range<_Base>) |
| 6405 | return bidirectional_iterator_tag{}; |
| 6406 | else |
| 6407 | return forward_iterator_tag{}; |
| 6408 | } |
| 6409 | |
| 6410 | friend chunk_view; |
| 6411 | |
| 6412 | public: |
| 6413 | using iterator_category = input_iterator_tag; |
| 6414 | using iterator_concept = decltype(_S_iter_cat()); |
| 6415 | using value_type = decltype(views::take(subrange(_M_current, _M_end), _M_n)); |
| 6416 | using difference_type = range_difference_t<_Base>; |
| 6417 | |
| 6418 | _Iterator() = default; |
| 6419 | |
| 6420 | constexpr _Iterator(_Iterator<!_Const> __i) |
| 6421 | requires _Const |
| 6422 | && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 6423 | && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 6424 | : _M_current(std::move(__i._M_current)), _M_end(std::move(__i._M_end)), |
| 6425 | _M_n(__i._M_n), _M_missing(__i._M_missing) |
| 6426 | { } |
| 6427 | |
| 6428 | constexpr iterator_t<_Base> |
| 6429 | base() const |
| 6430 | { return _M_current; } |
| 6431 | |
| 6432 | constexpr value_type |
| 6433 | operator*() const |
| 6434 | { |
| 6435 | __glibcxx_assert(_M_current != _M_end); |
| 6436 | return views::take(subrange(_M_current, _M_end), _M_n); |
| 6437 | } |
| 6438 | |
| 6439 | constexpr _Iterator& |
| 6440 | operator++() |
| 6441 | { |
| 6442 | __glibcxx_assert(_M_current != _M_end); |
| 6443 | _M_missing = ranges::advance(_M_current, _M_n, _M_end); |
| 6444 | return *this; |
| 6445 | } |
| 6446 | |
| 6447 | constexpr _Iterator |
| 6448 | operator++(int) |
| 6449 | { |
| 6450 | auto __tmp = *this; |
| 6451 | ++*this; |
| 6452 | return __tmp; |
| 6453 | } |
| 6454 | |
| 6455 | constexpr _Iterator& |
| 6456 | operator--() requires bidirectional_range<_Base> |
| 6457 | { |
| 6458 | ranges::advance(_M_current, _M_missing - _M_n); |
| 6459 | _M_missing = 0; |
| 6460 | return *this; |
| 6461 | } |
| 6462 | |
| 6463 | constexpr _Iterator |
| 6464 | operator--(int) requires bidirectional_range<_Base> |
| 6465 | { |
| 6466 | auto __tmp = *this; |
| 6467 | --*this; |
| 6468 | return __tmp; |
| 6469 | } |
| 6470 | |
| 6471 | constexpr _Iterator& |
| 6472 | operator+=(difference_type __x) |
| 6473 | requires random_access_range<_Base> |
| 6474 | { |
| 6475 | if (__x > 0) |
| 6476 | { |
| 6477 | __glibcxx_assert(ranges::distance(_M_current, _M_end) > _M_n * (__x - 1)); |
| 6478 | _M_missing = ranges::advance(_M_current, _M_n * __x, _M_end); |
| 6479 | } |
| 6480 | else if (__x < 0) |
| 6481 | { |
| 6482 | ranges::advance(_M_current, _M_n * __x + _M_missing); |
| 6483 | _M_missing = 0; |
| 6484 | } |
| 6485 | return *this; |
| 6486 | } |
| 6487 | |
| 6488 | constexpr _Iterator& |
| 6489 | operator-=(difference_type __x) |
| 6490 | requires random_access_range<_Base> |
| 6491 | { return *this += -__x; } |
| 6492 | |
| 6493 | constexpr value_type |
| 6494 | operator[](difference_type __n) const |
| 6495 | requires random_access_range<_Base> |
| 6496 | { return *(*this + __n); } |
| 6497 | |
| 6498 | friend constexpr bool |
| 6499 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 6500 | { return __x._M_current == __y._M_current; } |
| 6501 | |
| 6502 | friend constexpr bool |
| 6503 | operator==(const _Iterator& __x, default_sentinel_t) |
| 6504 | { return __x._M_current == __x._M_end; } |
| 6505 | |
| 6506 | friend constexpr bool |
| 6507 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 6508 | requires random_access_range<_Base> |
| 6509 | { return __x._M_current > __y._M_current; } |
| 6510 | |
| 6511 | friend constexpr bool |
| 6512 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 6513 | requires random_access_range<_Base> |
| 6514 | { return __y < __x; } |
| 6515 | |
| 6516 | friend constexpr bool |
| 6517 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 6518 | requires random_access_range<_Base> |
| 6519 | { return !(__y < __x); } |
| 6520 | |
| 6521 | friend constexpr bool |
| 6522 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 6523 | requires random_access_range<_Base> |
| 6524 | { return !(__x < __y); } |
| 6525 | |
| 6526 | friend constexpr auto |
| 6527 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 6528 | requires random_access_range<_Base> |
| 6529 | && three_way_comparable<iterator_t<_Base>> |
| 6530 | { return __x._M_current <=> __y._M_current; } |
| 6531 | |
| 6532 | friend constexpr _Iterator |
| 6533 | operator+(const _Iterator& __i, difference_type __n) |
| 6534 | requires random_access_range<_Base> |
| 6535 | { |
| 6536 | auto __r = __i; |
| 6537 | __r += __n; |
| 6538 | return __r; |
| 6539 | } |
| 6540 | |
| 6541 | friend constexpr _Iterator |
| 6542 | operator+(difference_type __n, const _Iterator& __i) |
| 6543 | requires random_access_range<_Base> |
| 6544 | { |
| 6545 | auto __r = __i; |
| 6546 | __r += __n; |
| 6547 | return __r; |
| 6548 | } |
| 6549 | |
| 6550 | friend constexpr _Iterator |
| 6551 | operator-(const _Iterator& __i, difference_type __n) |
| 6552 | requires random_access_range<_Base> |
| 6553 | { |
| 6554 | auto __r = __i; |
| 6555 | __r -= __n; |
| 6556 | return __r; |
| 6557 | } |
| 6558 | |
| 6559 | friend constexpr difference_type |
| 6560 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 6561 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 6562 | { |
| 6563 | return (__x._M_current - __y._M_current |
| 6564 | + __x._M_missing - __y._M_missing) / __x._M_n; |
| 6565 | } |
| 6566 | |
| 6567 | friend constexpr difference_type |
| 6568 | operator-(default_sentinel_t __y, const _Iterator& __x) |
| 6569 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 6570 | { return __detail::__div_ceil(__x._M_end - __x._M_current, __x._M_n); } |
| 6571 | |
| 6572 | friend constexpr difference_type |
| 6573 | operator-(const _Iterator& __x, default_sentinel_t __y) |
| 6574 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 6575 | { return -(__y - __x); } |
| 6576 | }; |
| 6577 | |
| 6578 | namespace views |
| 6579 | { |
| 6580 | namespace __detail |
| 6581 | { |
| 6582 | template<typename _Range, typename _Dp> |
| 6583 | concept __can_chunk_view |
| 6584 | = requires { chunk_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 6585 | } |
| 6586 | |
| 6587 | struct _Chunk : __adaptor::_RangeAdaptor<_Chunk> |
| 6588 | { |
| 6589 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 6590 | requires __detail::__can_chunk_view<_Range, _Dp> |
| 6591 | constexpr auto |
| 6592 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 6593 | { return chunk_view(std::forward<_Range>(__r), __n); } |
| 6594 | |
| 6595 | using __adaptor::_RangeAdaptor<_Chunk>::operator(); |
| 6596 | static constexpr int _S_arity = 2; |
| 6597 | static constexpr bool _S_has_simple_extra_args = true; |
| 6598 | }; |
| 6599 | |
| 6600 | inline constexpr _Chunk chunk; |
| 6601 | } |
| 6602 | #endif // __cpp_lib_ranges_chunk |
| 6603 | |
| 6604 | #ifdef __cpp_lib_ranges_slide // C++ >= 23 |
| 6605 | namespace __detail |
| 6606 | { |
| 6607 | template<typename _Vp> |
| 6608 | concept __slide_caches_nothing = random_access_range<_Vp> && sized_range<_Vp>; |
| 6609 | |
| 6610 | template<typename _Vp> |
| 6611 | concept __slide_caches_last |
| 6612 | = !__slide_caches_nothing<_Vp> && bidirectional_range<_Vp> && common_range<_Vp>; |
| 6613 | |
| 6614 | template<typename _Vp> |
| 6615 | concept __slide_caches_first |
| 6616 | = !__slide_caches_nothing<_Vp> && !__slide_caches_last<_Vp>; |
| 6617 | } |
| 6618 | |
| 6619 | template<forward_range _Vp> |
| 6620 | requires view<_Vp> |
| 6621 | class slide_view : public view_interface<slide_view<_Vp>> |
| 6622 | { |
| 6623 | _Vp _M_base; |
| 6624 | range_difference_t<_Vp> _M_n; |
| 6625 | [[no_unique_address]] |
| 6626 | __detail::__maybe_present_t<__detail::__slide_caches_first<_Vp>, |
| 6627 | __detail::_CachedPosition<_Vp>, 0> _M_cached_begin; |
| 6628 | [[no_unique_address]] |
| 6629 | __detail::__maybe_present_t<__detail::__slide_caches_last<_Vp>, |
| 6630 | __detail::_CachedPosition<_Vp>, 1> _M_cached_end; |
| 6631 | |
| 6632 | template<bool> class _Iterator; |
| 6633 | class _Sentinel; |
| 6634 | |
| 6635 | public: |
| 6636 | constexpr explicit |
| 6637 | slide_view(_Vp __base, range_difference_t<_Vp> __n) |
| 6638 | : _M_base(std::move(__base)), _M_n(__n) |
| 6639 | { __glibcxx_assert(__n > 0); } |
| 6640 | |
| 6641 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 6642 | // 3848. adjacent_view, adjacent_transform_view and slide_view missing base accessor |
| 6643 | constexpr _Vp |
| 6644 | base() const & requires copy_constructible<_Vp> |
| 6645 | { return _M_base; } |
| 6646 | |
| 6647 | constexpr _Vp |
| 6648 | base() && |
| 6649 | { return std::move(_M_base); } |
| 6650 | |
| 6651 | constexpr auto |
| 6652 | begin() requires (!(__detail::__simple_view<_Vp> |
| 6653 | && __detail::__slide_caches_nothing<const _Vp>)) |
| 6654 | { |
| 6655 | if constexpr (__detail::__slide_caches_first<_Vp>) |
| 6656 | { |
| 6657 | iterator_t<_Vp> __it; |
| 6658 | if (_M_cached_begin._M_has_value()) |
| 6659 | __it = _M_cached_begin._M_get(_M_base); |
| 6660 | else |
| 6661 | { |
| 6662 | __it = ranges::next(ranges::begin(_M_base), _M_n - 1, ranges::end(_M_base)); |
| 6663 | _M_cached_begin._M_set(_M_base, __it); |
| 6664 | } |
| 6665 | return _Iterator<false>(ranges::begin(_M_base), std::move(__it), _M_n); |
| 6666 | } |
| 6667 | else |
| 6668 | return _Iterator<false>(ranges::begin(_M_base), _M_n); |
| 6669 | } |
| 6670 | |
| 6671 | constexpr auto |
| 6672 | begin() const requires __detail::__slide_caches_nothing<const _Vp> |
| 6673 | { return _Iterator<true>(ranges::begin(_M_base), _M_n); } |
| 6674 | |
| 6675 | constexpr auto |
| 6676 | end() requires (!(__detail::__simple_view<_Vp> |
| 6677 | && __detail::__slide_caches_nothing<const _Vp>)) |
| 6678 | { |
| 6679 | if constexpr (__detail::__slide_caches_nothing<_Vp>) |
| 6680 | return _Iterator<false>(ranges::begin(_M_base) + range_difference_t<_Vp>(size()), |
| 6681 | _M_n); |
| 6682 | else if constexpr (__detail::__slide_caches_last<_Vp>) |
| 6683 | { |
| 6684 | iterator_t<_Vp> __it; |
| 6685 | if (_M_cached_end._M_has_value()) |
| 6686 | __it = _M_cached_end._M_get(_M_base); |
| 6687 | else |
| 6688 | { |
| 6689 | __it = ranges::prev(ranges::end(_M_base), _M_n - 1, ranges::begin(_M_base)); |
| 6690 | _M_cached_end._M_set(_M_base, __it); |
| 6691 | } |
| 6692 | return _Iterator<false>(std::move(__it), _M_n); |
| 6693 | } |
| 6694 | else if constexpr (common_range<_Vp>) |
| 6695 | return _Iterator<false>(ranges::end(_M_base), ranges::end(_M_base), _M_n); |
| 6696 | else |
| 6697 | return _Sentinel(ranges::end(_M_base)); |
| 6698 | } |
| 6699 | |
| 6700 | constexpr auto |
| 6701 | end() const requires __detail::__slide_caches_nothing<const _Vp> |
| 6702 | { return begin() + range_difference_t<const _Vp>(size()); } |
| 6703 | |
| 6704 | constexpr auto |
| 6705 | size() requires sized_range<_Vp> |
| 6706 | { |
| 6707 | auto __sz = ranges::distance(_M_base) - _M_n + 1; |
| 6708 | if (__sz < 0) |
| 6709 | __sz = 0; |
| 6710 | return __detail::__to_unsigned_like(__sz); |
| 6711 | } |
| 6712 | |
| 6713 | constexpr auto |
| 6714 | size() const requires sized_range<const _Vp> |
| 6715 | { |
| 6716 | auto __sz = ranges::distance(_M_base) - _M_n + 1; |
| 6717 | if (__sz < 0) |
| 6718 | __sz = 0; |
| 6719 | return __detail::__to_unsigned_like(__sz); |
| 6720 | } |
| 6721 | }; |
| 6722 | |
| 6723 | template<typename _Range> |
| 6724 | slide_view(_Range&&, range_difference_t<_Range>) -> slide_view<views::all_t<_Range>>; |
| 6725 | |
| 6726 | template<typename _Vp> |
| 6727 | inline constexpr bool enable_borrowed_range<slide_view<_Vp>> |
| 6728 | = enable_borrowed_range<_Vp>; |
| 6729 | |
| 6730 | template<forward_range _Vp> |
| 6731 | requires view<_Vp> |
| 6732 | template<bool _Const> |
| 6733 | class slide_view<_Vp>::_Iterator |
| 6734 | { |
| 6735 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 6736 | static constexpr bool _S_last_elt_present |
| 6737 | = __detail::__slide_caches_first<_Base>; |
| 6738 | |
| 6739 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 6740 | [[no_unique_address]] |
| 6741 | __detail::__maybe_present_t<_S_last_elt_present, iterator_t<_Base>> |
| 6742 | _M_last_elt = decltype(_M_last_elt)(); |
| 6743 | range_difference_t<_Base> _M_n = 0; |
| 6744 | |
| 6745 | constexpr |
| 6746 | _Iterator(iterator_t<_Base> __current, range_difference_t<_Base> __n) |
| 6747 | requires (!_S_last_elt_present) |
| 6748 | : _M_current(__current), _M_n(__n) |
| 6749 | { } |
| 6750 | |
| 6751 | constexpr |
| 6752 | _Iterator(iterator_t<_Base> __current, iterator_t<_Base> __last_elt, |
| 6753 | range_difference_t<_Base> __n) |
| 6754 | requires _S_last_elt_present |
| 6755 | : _M_current(__current), _M_last_elt(__last_elt), _M_n(__n) |
| 6756 | { } |
| 6757 | |
| 6758 | static auto |
| 6759 | _S_iter_concept() |
| 6760 | { |
| 6761 | if constexpr (random_access_range<_Base>) |
| 6762 | return random_access_iterator_tag{}; |
| 6763 | else if constexpr (bidirectional_range<_Base>) |
| 6764 | return bidirectional_iterator_tag{}; |
| 6765 | else |
| 6766 | return forward_iterator_tag{}; |
| 6767 | } |
| 6768 | |
| 6769 | friend slide_view; |
| 6770 | friend slide_view::_Sentinel; |
| 6771 | |
| 6772 | public: |
| 6773 | using iterator_category = input_iterator_tag; |
| 6774 | using iterator_concept = decltype(_S_iter_concept()); |
| 6775 | using value_type = decltype(views::counted(_M_current, _M_n)); |
| 6776 | using difference_type = range_difference_t<_Base>; |
| 6777 | |
| 6778 | _Iterator() = default; |
| 6779 | |
| 6780 | constexpr |
| 6781 | _Iterator(_Iterator<!_Const> __i) |
| 6782 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 6783 | : _M_current(std::move(__i._M_current)), _M_n(__i._M_n) |
| 6784 | { } |
| 6785 | |
| 6786 | constexpr auto |
| 6787 | operator*() const |
| 6788 | { return views::counted(_M_current, _M_n); } |
| 6789 | |
| 6790 | constexpr _Iterator& |
| 6791 | operator++() |
| 6792 | { |
| 6793 | ++_M_current; |
| 6794 | if constexpr (_S_last_elt_present) |
| 6795 | ++_M_last_elt; |
| 6796 | return *this; |
| 6797 | } |
| 6798 | |
| 6799 | constexpr _Iterator |
| 6800 | operator++(int) |
| 6801 | { |
| 6802 | auto __tmp = *this; |
| 6803 | ++*this; |
| 6804 | return __tmp; |
| 6805 | } |
| 6806 | |
| 6807 | constexpr _Iterator& |
| 6808 | operator--() requires bidirectional_range<_Base> |
| 6809 | { |
| 6810 | --_M_current; |
| 6811 | if constexpr (_S_last_elt_present) |
| 6812 | --_M_last_elt; |
| 6813 | return *this; |
| 6814 | } |
| 6815 | |
| 6816 | constexpr _Iterator |
| 6817 | operator--(int) requires bidirectional_range<_Base> |
| 6818 | { |
| 6819 | auto __tmp = *this; |
| 6820 | --*this; |
| 6821 | return __tmp; |
| 6822 | } |
| 6823 | |
| 6824 | constexpr _Iterator& |
| 6825 | operator+=(difference_type __x) |
| 6826 | requires random_access_range<_Base> |
| 6827 | { |
| 6828 | _M_current += __x; |
| 6829 | if constexpr (_S_last_elt_present) |
| 6830 | _M_last_elt += __x; |
| 6831 | return *this; |
| 6832 | } |
| 6833 | |
| 6834 | constexpr _Iterator& |
| 6835 | operator-=(difference_type __x) |
| 6836 | requires random_access_range<_Base> |
| 6837 | { |
| 6838 | _M_current -= __x; |
| 6839 | if constexpr (_S_last_elt_present) |
| 6840 | _M_last_elt -= __x; |
| 6841 | return *this; |
| 6842 | } |
| 6843 | |
| 6844 | constexpr auto |
| 6845 | operator[](difference_type __n) const |
| 6846 | requires random_access_range<_Base> |
| 6847 | { return views::counted(_M_current + __n, _M_n); } |
| 6848 | |
| 6849 | friend constexpr bool |
| 6850 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 6851 | { |
| 6852 | if constexpr (_S_last_elt_present) |
| 6853 | return __x._M_last_elt == __y._M_last_elt; |
| 6854 | else |
| 6855 | return __x._M_current == __y._M_current; |
| 6856 | } |
| 6857 | |
| 6858 | friend constexpr bool |
| 6859 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 6860 | requires random_access_range<_Base> |
| 6861 | { return __x._M_current < __y._M_current; } |
| 6862 | |
| 6863 | friend constexpr bool |
| 6864 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 6865 | requires random_access_range<_Base> |
| 6866 | { return __y < __x; } |
| 6867 | |
| 6868 | friend constexpr bool |
| 6869 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 6870 | requires random_access_range<_Base> |
| 6871 | { return !(__y < __x); } |
| 6872 | |
| 6873 | friend constexpr bool |
| 6874 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 6875 | requires random_access_range<_Base> |
| 6876 | { return !(__x < __y); } |
| 6877 | |
| 6878 | friend constexpr auto |
| 6879 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 6880 | requires random_access_range<_Base> |
| 6881 | && three_way_comparable<iterator_t<_Base>> |
| 6882 | { return __x._M_current <=> __y._M_current; } |
| 6883 | |
| 6884 | friend constexpr _Iterator |
| 6885 | operator+(const _Iterator& __i, difference_type __n) |
| 6886 | requires random_access_range<_Base> |
| 6887 | { |
| 6888 | auto __r = __i; |
| 6889 | __r += __n; |
| 6890 | return __r; |
| 6891 | } |
| 6892 | |
| 6893 | friend constexpr _Iterator |
| 6894 | operator+(difference_type __n, const _Iterator& __i) |
| 6895 | requires random_access_range<_Base> |
| 6896 | { |
| 6897 | auto __r = __i; |
| 6898 | __r += __n; |
| 6899 | return __r; |
| 6900 | } |
| 6901 | |
| 6902 | friend constexpr _Iterator |
| 6903 | operator-(const _Iterator& __i, difference_type __n) |
| 6904 | requires random_access_range<_Base> |
| 6905 | { |
| 6906 | auto __r = __i; |
| 6907 | __r -= __n; |
| 6908 | return __r; |
| 6909 | } |
| 6910 | |
| 6911 | friend constexpr difference_type |
| 6912 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 6913 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 6914 | { |
| 6915 | if constexpr (_S_last_elt_present) |
| 6916 | return __x._M_last_elt - __y._M_last_elt; |
| 6917 | else |
| 6918 | return __x._M_current - __y._M_current; |
| 6919 | } |
| 6920 | }; |
| 6921 | |
| 6922 | template<forward_range _Vp> |
| 6923 | requires view<_Vp> |
| 6924 | class slide_view<_Vp>::_Sentinel |
| 6925 | { |
| 6926 | sentinel_t<_Vp> _M_end = sentinel_t<_Vp>(); |
| 6927 | |
| 6928 | constexpr explicit |
| 6929 | _Sentinel(sentinel_t<_Vp> __end) |
| 6930 | : _M_end(__end) |
| 6931 | { } |
| 6932 | |
| 6933 | friend slide_view; |
| 6934 | |
| 6935 | public: |
| 6936 | _Sentinel() = default; |
| 6937 | |
| 6938 | friend constexpr bool |
| 6939 | operator==(const _Iterator<false>& __x, const _Sentinel& __y) |
| 6940 | { return __x._M_last_elt == __y._M_end; } |
| 6941 | |
| 6942 | friend constexpr range_difference_t<_Vp> |
| 6943 | operator-(const _Iterator<false>& __x, const _Sentinel& __y) |
| 6944 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6945 | { return __x._M_last_elt - __y._M_end; } |
| 6946 | |
| 6947 | friend constexpr range_difference_t<_Vp> |
| 6948 | operator-(const _Sentinel& __y, const _Iterator<false>& __x) |
| 6949 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6950 | { return __y._M_end -__x._M_last_elt; } |
| 6951 | }; |
| 6952 | |
| 6953 | namespace views |
| 6954 | { |
| 6955 | namespace __detail |
| 6956 | { |
| 6957 | template<typename _Range, typename _Dp> |
| 6958 | concept __can_slide_view |
| 6959 | = requires { slide_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 6960 | } |
| 6961 | |
| 6962 | struct _Slide : __adaptor::_RangeAdaptor<_Slide> |
| 6963 | { |
| 6964 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 6965 | requires __detail::__can_slide_view<_Range, _Dp> |
| 6966 | constexpr auto |
| 6967 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 6968 | { return slide_view(std::forward<_Range>(__r), __n); } |
| 6969 | |
| 6970 | using __adaptor::_RangeAdaptor<_Slide>::operator(); |
| 6971 | static constexpr int _S_arity = 2; |
| 6972 | static constexpr bool _S_has_simple_extra_args = true; |
| 6973 | }; |
| 6974 | |
| 6975 | inline constexpr _Slide slide; |
| 6976 | } |
| 6977 | #endif // __cpp_lib_ranges_slide |
| 6978 | |
| 6979 | #ifdef __cpp_lib_ranges_chunk_by // C++ >= 23 |
| 6980 | template<forward_range _Vp, |
| 6981 | indirect_binary_predicate<iterator_t<_Vp>, iterator_t<_Vp>> _Pred> |
| 6982 | requires view<_Vp> && is_object_v<_Pred> |
| 6983 | class chunk_by_view : public view_interface<chunk_by_view<_Vp, _Pred>> |
| 6984 | { |
| 6985 | _Vp _M_base = _Vp(); |
| 6986 | __detail::__box<_Pred> _M_pred; |
| 6987 | __detail::_CachedPosition<_Vp> _M_cached_begin; |
| 6988 | |
| 6989 | constexpr iterator_t<_Vp> |
| 6990 | _M_find_next(iterator_t<_Vp> __current) |
| 6991 | { |
| 6992 | __glibcxx_assert(_M_pred.has_value()); |
| 6993 | auto __pred = [this]<typename _Tp, typename _Up>(_Tp&& __x, _Up&& __y) { |
| 6994 | return !bool((*_M_pred)(std::forward<_Tp>(__x), std::forward<_Up>(__y))); |
| 6995 | }; |
| 6996 | auto __it = ranges::adjacent_find(__current, ranges::end(_M_base), __pred); |
| 6997 | return ranges::next(__it, 1, ranges::end(_M_base)); |
| 6998 | } |
| 6999 | |
| 7000 | constexpr iterator_t<_Vp> |
| 7001 | _M_find_prev(iterator_t<_Vp> __current) requires bidirectional_range<_Vp> |
| 7002 | { |
| 7003 | __glibcxx_assert(_M_pred.has_value()); |
| 7004 | auto __pred = [this]<typename _Tp, typename _Up>(_Tp&& __x, _Up&& __y) { |
| 7005 | return !bool((*_M_pred)(std::forward<_Up>(__y), std::forward<_Tp>(__x))); |
| 7006 | }; |
| 7007 | auto __rbegin = std::make_reverse_iterator(__current); |
| 7008 | auto __rend = std::make_reverse_iterator(ranges::begin(_M_base)); |
| 7009 | __glibcxx_assert(__rbegin != __rend); |
| 7010 | auto __it = ranges::adjacent_find(__rbegin, __rend, __pred).base(); |
| 7011 | return ranges::prev(__it, 1, ranges::begin(_M_base)); |
| 7012 | } |
| 7013 | |
| 7014 | class _Iterator; |
| 7015 | |
| 7016 | public: |
| 7017 | chunk_by_view() requires (default_initializable<_Vp> |
| 7018 | && default_initializable<_Pred>) |
| 7019 | = default; |
| 7020 | |
| 7021 | constexpr explicit |
| 7022 | chunk_by_view(_Vp __base, _Pred __pred) |
| 7023 | : _M_base(std::move(__base)), _M_pred(std::move(__pred)) |
| 7024 | { } |
| 7025 | |
| 7026 | constexpr _Vp |
| 7027 | base() const & requires copy_constructible<_Vp> |
| 7028 | { return _M_base; } |
| 7029 | |
| 7030 | constexpr _Vp |
| 7031 | base() && |
| 7032 | { return std::move(_M_base); } |
| 7033 | |
| 7034 | constexpr const _Pred& |
| 7035 | pred() const |
| 7036 | { return *_M_pred; } |
| 7037 | |
| 7038 | constexpr _Iterator |
| 7039 | begin() |
| 7040 | { |
| 7041 | __glibcxx_assert(_M_pred.has_value()); |
| 7042 | iterator_t<_Vp> __it; |
| 7043 | if (_M_cached_begin._M_has_value()) |
| 7044 | __it = _M_cached_begin._M_get(_M_base); |
| 7045 | else |
| 7046 | { |
| 7047 | __it = _M_find_next(ranges::begin(_M_base)); |
| 7048 | _M_cached_begin._M_set(_M_base, __it); |
| 7049 | } |
| 7050 | return _Iterator(*this, ranges::begin(_M_base), __it); |
| 7051 | } |
| 7052 | |
| 7053 | constexpr auto |
| 7054 | end() |
| 7055 | { |
| 7056 | if constexpr (common_range<_Vp>) |
| 7057 | return _Iterator(*this, ranges::end(_M_base), ranges::end(_M_base)); |
| 7058 | else |
| 7059 | return default_sentinel; |
| 7060 | } |
| 7061 | }; |
| 7062 | |
| 7063 | template<typename _Range, typename _Pred> |
| 7064 | chunk_by_view(_Range&&, _Pred) -> chunk_by_view<views::all_t<_Range>, _Pred>; |
| 7065 | |
| 7066 | template<forward_range _Vp, |
| 7067 | indirect_binary_predicate<iterator_t<_Vp>, iterator_t<_Vp>> _Pred> |
| 7068 | requires view<_Vp> && is_object_v<_Pred> |
| 7069 | class chunk_by_view<_Vp, _Pred>::_Iterator |
| 7070 | { |
| 7071 | chunk_by_view* _M_parent = nullptr; |
| 7072 | iterator_t<_Vp> _M_current = iterator_t<_Vp>(); |
| 7073 | iterator_t<_Vp> _M_next = iterator_t<_Vp>(); |
| 7074 | |
| 7075 | constexpr |
| 7076 | _Iterator(chunk_by_view& __parent, iterator_t<_Vp> __current, iterator_t<_Vp> __next) |
| 7077 | : _M_parent(std::__addressof(__parent)), _M_current(__current), _M_next(__next) |
| 7078 | { } |
| 7079 | |
| 7080 | static auto |
| 7081 | _S_iter_concept() |
| 7082 | { |
| 7083 | if constexpr (bidirectional_range<_Vp>) |
| 7084 | return bidirectional_iterator_tag{}; |
| 7085 | else |
| 7086 | return forward_iterator_tag{}; |
| 7087 | } |
| 7088 | |
| 7089 | friend chunk_by_view; |
| 7090 | |
| 7091 | public: |
| 7092 | using value_type = subrange<iterator_t<_Vp>>; |
| 7093 | using difference_type = range_difference_t<_Vp>; |
| 7094 | using iterator_category = input_iterator_tag; |
| 7095 | using iterator_concept = decltype(_S_iter_concept()); |
| 7096 | |
| 7097 | _Iterator() = default; |
| 7098 | |
| 7099 | constexpr value_type |
| 7100 | operator*() const |
| 7101 | { |
| 7102 | __glibcxx_assert(_M_current != _M_next); |
| 7103 | return ranges::subrange(_M_current, _M_next); |
| 7104 | } |
| 7105 | |
| 7106 | constexpr _Iterator& |
| 7107 | operator++() |
| 7108 | { |
| 7109 | __glibcxx_assert(_M_current != _M_next); |
| 7110 | _M_current = _M_next; |
| 7111 | _M_next = _M_parent->_M_find_next(_M_current); |
| 7112 | return *this; |
| 7113 | } |
| 7114 | |
| 7115 | constexpr _Iterator |
| 7116 | operator++(int) |
| 7117 | { |
| 7118 | auto __tmp = *this; |
| 7119 | ++*this; |
| 7120 | return __tmp; |
| 7121 | } |
| 7122 | |
| 7123 | constexpr _Iterator& |
| 7124 | operator--() requires bidirectional_range<_Vp> |
| 7125 | { |
| 7126 | _M_next = _M_current; |
| 7127 | _M_current = _M_parent->_M_find_prev(_M_next); |
| 7128 | return *this; |
| 7129 | } |
| 7130 | |
| 7131 | constexpr _Iterator |
| 7132 | operator--(int) requires bidirectional_range<_Vp> |
| 7133 | { |
| 7134 | auto __tmp = *this; |
| 7135 | --*this; |
| 7136 | return __tmp; |
| 7137 | } |
| 7138 | |
| 7139 | friend constexpr bool |
| 7140 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 7141 | { return __x._M_current == __y._M_current; } |
| 7142 | |
| 7143 | friend constexpr bool |
| 7144 | operator==(const _Iterator& __x, default_sentinel_t) |
| 7145 | { return __x._M_current == __x._M_next; } |
| 7146 | }; |
| 7147 | |
| 7148 | namespace views |
| 7149 | { |
| 7150 | namespace __detail |
| 7151 | { |
| 7152 | template<typename _Range, typename _Pred> |
| 7153 | concept __can_chunk_by_view |
| 7154 | = requires { chunk_by_view(std::declval<_Range>(), std::declval<_Pred>()); }; |
| 7155 | } |
| 7156 | |
| 7157 | struct _ChunkBy : __adaptor::_RangeAdaptor<_ChunkBy> |
| 7158 | { |
| 7159 | template<viewable_range _Range, typename _Pred> |
| 7160 | requires __detail::__can_chunk_by_view<_Range, _Pred> |
| 7161 | constexpr auto |
| 7162 | operator() [[nodiscard]] (_Range&& __r, _Pred&& __pred) const |
| 7163 | { return chunk_by_view(std::forward<_Range>(__r), std::forward<_Pred>(__pred)); } |
| 7164 | |
| 7165 | using __adaptor::_RangeAdaptor<_ChunkBy>::operator(); |
| 7166 | static constexpr int _S_arity = 2; |
| 7167 | static constexpr bool _S_has_simple_extra_args = true; |
| 7168 | }; |
| 7169 | |
| 7170 | inline constexpr _ChunkBy chunk_by; |
| 7171 | } |
| 7172 | #endif // __cpp_lib_ranges_chunk_by |
| 7173 | |
| 7174 | #ifdef __cpp_lib_ranges_join_with // C++ >= 23 |
| 7175 | namespace __detail |
| 7176 | { |
| 7177 | template<typename _Range, typename _Pattern> |
| 7178 | concept __compatible_joinable_ranges |
| 7179 | = common_with<range_value_t<_Range>, range_value_t<_Pattern>> |
| 7180 | && common_reference_with<range_reference_t<_Range>, |
| 7181 | range_reference_t<_Pattern>> |
| 7182 | && common_reference_with<range_rvalue_reference_t<_Range>, |
| 7183 | range_rvalue_reference_t<_Pattern>>; |
| 7184 | |
| 7185 | template<typename _Range> |
| 7186 | concept __bidirectional_common = bidirectional_range<_Range> && common_range<_Range>; |
| 7187 | } |
| 7188 | |
| 7189 | template<input_range _Vp, forward_range _Pattern> |
| 7190 | requires view<_Vp> && view<_Pattern> |
| 7191 | && input_range<range_reference_t<_Vp>> |
| 7192 | && __detail::__compatible_joinable_ranges<range_reference_t<_Vp>, _Pattern> |
| 7193 | class join_with_view : public view_interface<join_with_view<_Vp, _Pattern>> |
| 7194 | { |
| 7195 | using _InnerRange = range_reference_t<_Vp>; |
| 7196 | |
| 7197 | _Vp _M_base = _Vp(); |
| 7198 | [[no_unique_address]] |
| 7199 | __detail::__maybe_present_t<!forward_range<_Vp>, |
| 7200 | __detail::__non_propagating_cache<iterator_t<_Vp>>> _M_outer_it; |
| 7201 | __detail::__non_propagating_cache<remove_cv_t<_InnerRange>> _M_inner; |
| 7202 | _Pattern _M_pattern = _Pattern(); |
| 7203 | |
| 7204 | template<bool _Const> using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 7205 | template<bool _Const> using _InnerBase = range_reference_t<_Base<_Const>>; |
| 7206 | template<bool _Const> using _PatternBase = __detail::__maybe_const_t<_Const, _Pattern>; |
| 7207 | |
| 7208 | template<bool _Const> using _OuterIter = iterator_t<_Base<_Const>>; |
| 7209 | template<bool _Const> using _InnerIter = iterator_t<_InnerBase<_Const>>; |
| 7210 | template<bool _Const> using _PatternIter = iterator_t<_PatternBase<_Const>>; |
| 7211 | |
| 7212 | template<bool _Const> |
| 7213 | static constexpr bool _S_ref_is_glvalue = is_reference_v<_InnerBase<_Const>>; |
| 7214 | |
| 7215 | template<bool _Const> |
| 7216 | struct __iter_cat |
| 7217 | { }; |
| 7218 | |
| 7219 | template<bool _Const> |
| 7220 | requires _S_ref_is_glvalue<_Const> |
| 7221 | && forward_range<_Base<_Const>> |
| 7222 | && forward_range<_InnerBase<_Const>> |
| 7223 | struct __iter_cat<_Const> |
| 7224 | { |
| 7225 | private: |
| 7226 | static auto |
| 7227 | _S_iter_cat() |
| 7228 | { |
| 7229 | using _OuterIter = join_with_view::_OuterIter<_Const>; |
| 7230 | using _InnerIter = join_with_view::_InnerIter<_Const>; |
| 7231 | using _PatternIter = join_with_view::_PatternIter<_Const>; |
| 7232 | using _OuterCat = typename iterator_traits<_OuterIter>::iterator_category; |
| 7233 | using _InnerCat = typename iterator_traits<_InnerIter>::iterator_category; |
| 7234 | using _PatternCat = typename iterator_traits<_PatternIter>::iterator_category; |
| 7235 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 7236 | // 3798. Rvalue reference and iterator_category |
| 7237 | if constexpr (!is_reference_v<common_reference_t<iter_reference_t<_InnerIter>, |
| 7238 | iter_reference_t<_PatternIter>>>) |
| 7239 | return input_iterator_tag{}; |
| 7240 | else if constexpr (derived_from<_OuterCat, bidirectional_iterator_tag> |
| 7241 | && derived_from<_InnerCat, bidirectional_iterator_tag> |
| 7242 | && derived_from<_PatternCat, bidirectional_iterator_tag> |
| 7243 | && common_range<_InnerBase<_Const>> |
| 7244 | && common_range<_PatternBase<_Const>>) |
| 7245 | return bidirectional_iterator_tag{}; |
| 7246 | else if constexpr (derived_from<_OuterCat, forward_iterator_tag> |
| 7247 | && derived_from<_InnerCat, forward_iterator_tag> |
| 7248 | && derived_from<_PatternCat, forward_iterator_tag>) |
| 7249 | return forward_iterator_tag{}; |
| 7250 | else |
| 7251 | return input_iterator_tag{}; |
| 7252 | } |
| 7253 | public: |
| 7254 | using iterator_category = decltype(_S_iter_cat()); |
| 7255 | }; |
| 7256 | |
| 7257 | template<bool> struct _Iterator; |
| 7258 | template<bool> struct _Sentinel; |
| 7259 | |
| 7260 | public: |
| 7261 | join_with_view() requires (default_initializable<_Vp> |
| 7262 | && default_initializable<_Pattern>) |
| 7263 | = default; |
| 7264 | |
| 7265 | constexpr |
| 7266 | join_with_view(_Vp __base, _Pattern __pattern) |
| 7267 | : _M_base(std::move(__base)), _M_pattern(std::move(__pattern)) |
| 7268 | { } |
| 7269 | |
| 7270 | template<input_range _Range> |
| 7271 | requires constructible_from<_Vp, views::all_t<_Range>> |
| 7272 | && constructible_from<_Pattern, single_view<range_value_t<_InnerRange>>> |
| 7273 | constexpr |
| 7274 | join_with_view(_Range&& __r, range_value_t<_InnerRange> __e) |
| 7275 | : _M_base(views::all(std::forward<_Range>(__r))), |
| 7276 | _M_pattern(views::single(std::move(__e))) |
| 7277 | { } |
| 7278 | |
| 7279 | constexpr _Vp |
| 7280 | base() const& requires copy_constructible<_Vp> |
| 7281 | { return _M_base; } |
| 7282 | |
| 7283 | constexpr _Vp |
| 7284 | base() && |
| 7285 | { return std::move(_M_base); } |
| 7286 | |
| 7287 | constexpr auto |
| 7288 | begin() |
| 7289 | { |
| 7290 | if constexpr (forward_range<_Vp>) |
| 7291 | { |
| 7292 | constexpr bool __use_const = is_reference_v<_InnerRange> |
| 7293 | && __detail::__simple_view<_Vp> && __detail::__simple_view<_Pattern>; |
| 7294 | return _Iterator<__use_const>{*this, ranges::begin(_M_base)}; |
| 7295 | } |
| 7296 | else |
| 7297 | { |
| 7298 | _M_outer_it = ranges::begin(_M_base); |
| 7299 | return _Iterator<false>{*this}; |
| 7300 | } |
| 7301 | } |
| 7302 | |
| 7303 | constexpr auto |
| 7304 | begin() const |
| 7305 | requires forward_range<const _Vp> |
| 7306 | && forward_range<const _Pattern> |
| 7307 | && is_reference_v<range_reference_t<const _Vp>> |
| 7308 | && input_range<range_reference_t<const _Vp>> |
| 7309 | { return _Iterator<true>{*this, ranges::begin(_M_base)}; } |
| 7310 | |
| 7311 | constexpr auto |
| 7312 | end() |
| 7313 | { |
| 7314 | constexpr bool __use_const |
| 7315 | = __detail::__simple_view<_Vp> && __detail::__simple_view<_Pattern>; |
| 7316 | if constexpr (is_reference_v<_InnerRange> |
| 7317 | && forward_range<_Vp> && common_range<_Vp> |
| 7318 | && forward_range<_InnerRange> && common_range<_InnerRange>) |
| 7319 | return _Iterator<__use_const>{*this, ranges::end(_M_base)}; |
| 7320 | else |
| 7321 | return _Sentinel<__use_const>{*this}; |
| 7322 | } |
| 7323 | |
| 7324 | constexpr auto |
| 7325 | end() const |
| 7326 | requires forward_range<const _Vp> |
| 7327 | && forward_range<const _Pattern> |
| 7328 | && is_reference_v<range_reference_t<const _Vp>> |
| 7329 | && input_range<range_reference_t<const _Vp>> |
| 7330 | { |
| 7331 | using _InnerConstRange = range_reference_t<const _Vp>; |
| 7332 | if constexpr (forward_range<_InnerConstRange> |
| 7333 | && common_range<const _Vp> |
| 7334 | && common_range<_InnerConstRange>) |
| 7335 | return _Iterator<true>{*this, ranges::end(_M_base)}; |
| 7336 | else |
| 7337 | return _Sentinel<true>{*this}; |
| 7338 | } |
| 7339 | }; |
| 7340 | |
| 7341 | template<typename _Range, typename _Pattern> |
| 7342 | join_with_view(_Range&&, _Pattern&&) |
| 7343 | -> join_with_view<views::all_t<_Range>, views::all_t<_Pattern>>; |
| 7344 | |
| 7345 | template<input_range _Range> |
| 7346 | join_with_view(_Range&&, range_value_t<range_reference_t<_Range>>) |
| 7347 | -> join_with_view<views::all_t<_Range>, |
| 7348 | single_view<range_value_t<range_reference_t<_Range>>>>; |
| 7349 | |
| 7350 | template<input_range _Vp, forward_range _Pattern> |
| 7351 | requires view<_Vp> && view<_Pattern> |
| 7352 | && input_range<range_reference_t<_Vp>> |
| 7353 | && __detail::__compatible_joinable_ranges<range_reference_t<_Vp>, _Pattern> |
| 7354 | template<bool _Const> |
| 7355 | class join_with_view<_Vp, _Pattern>::_Iterator : public __iter_cat<_Const> |
| 7356 | { |
| 7357 | using _Parent = __detail::__maybe_const_t<_Const, join_with_view>; |
| 7358 | using _Base = join_with_view::_Base<_Const>; |
| 7359 | using _InnerBase = join_with_view::_InnerBase<_Const>; |
| 7360 | using _PatternBase = join_with_view::_PatternBase<_Const>; |
| 7361 | |
| 7362 | using _OuterIter = join_with_view::_OuterIter<_Const>; |
| 7363 | using _InnerIter = join_with_view::_InnerIter<_Const>; |
| 7364 | using _PatternIter = join_with_view::_PatternIter<_Const>; |
| 7365 | |
| 7366 | static constexpr bool _S_ref_is_glvalue = join_with_view::_S_ref_is_glvalue<_Const>; |
| 7367 | |
| 7368 | _Parent* _M_parent = nullptr; |
| 7369 | [[no_unique_address]] |
| 7370 | __detail::__maybe_present_t<forward_range<_Base>, _OuterIter> _M_outer_it; |
| 7371 | variant<_PatternIter, _InnerIter> _M_inner_it; |
| 7372 | |
| 7373 | constexpr _OuterIter& |
| 7374 | _M_get_outer() |
| 7375 | { |
| 7376 | if constexpr (forward_range<_Base>) |
| 7377 | return _M_outer_it; |
| 7378 | else |
| 7379 | return *_M_parent->_M_outer_it; |
| 7380 | } |
| 7381 | |
| 7382 | constexpr const _OuterIter& |
| 7383 | _M_get_outer() const |
| 7384 | { |
| 7385 | if constexpr (forward_range<_Base>) |
| 7386 | return _M_outer_it; |
| 7387 | else |
| 7388 | return *_M_parent->_M_outer_it; |
| 7389 | } |
| 7390 | |
| 7391 | constexpr |
| 7392 | _Iterator(_Parent& __parent, _OuterIter __outer) |
| 7393 | requires forward_range<_Base> |
| 7394 | : _M_parent(std::__addressof(__parent)), _M_outer_it(std::move(__outer)) |
| 7395 | { |
| 7396 | if (_M_get_outer() != ranges::end(_M_parent->_M_base)) |
| 7397 | { |
| 7398 | auto&& __inner = _M_update_inner(); |
| 7399 | _M_inner_it.template emplace<1>(ranges::begin(__inner)); |
| 7400 | _M_satisfy(); |
| 7401 | } |
| 7402 | } |
| 7403 | |
| 7404 | constexpr |
| 7405 | _Iterator(_Parent& __parent) |
| 7406 | requires (!forward_range<_Base>) |
| 7407 | : _M_parent(std::__addressof(__parent)) |
| 7408 | { |
| 7409 | if (_M_get_outer() != ranges::end(_M_parent->_M_base)) |
| 7410 | { |
| 7411 | auto&& __inner = _M_update_inner(); |
| 7412 | _M_inner_it.template emplace<1>(ranges::begin(__inner)); |
| 7413 | _M_satisfy(); |
| 7414 | } |
| 7415 | } |
| 7416 | |
| 7417 | constexpr auto& |
| 7418 | _M_update_inner() |
| 7419 | { |
| 7420 | _OuterIter& __outer = _M_get_outer(); |
| 7421 | if constexpr (_S_ref_is_glvalue) |
| 7422 | return __detail::__as_lvalue(*__outer); |
| 7423 | else |
| 7424 | return _M_parent->_M_inner._M_emplace_deref(__outer); |
| 7425 | } |
| 7426 | |
| 7427 | constexpr auto& |
| 7428 | _M_get_inner() |
| 7429 | { |
| 7430 | if constexpr (_S_ref_is_glvalue) |
| 7431 | return __detail::__as_lvalue(*_M_get_outer()); |
| 7432 | else |
| 7433 | return *_M_parent->_M_inner; |
| 7434 | } |
| 7435 | |
| 7436 | constexpr void |
| 7437 | _M_satisfy() |
| 7438 | { |
| 7439 | while (true) |
| 7440 | { |
| 7441 | if (_M_inner_it.index() == 0) |
| 7442 | { |
| 7443 | if (std::get<0>(_M_inner_it) != ranges::end(_M_parent->_M_pattern)) |
| 7444 | break; |
| 7445 | |
| 7446 | auto&& __inner = _M_update_inner(); |
| 7447 | _M_inner_it.template emplace<1>(ranges::begin(__inner)); |
| 7448 | } |
| 7449 | else |
| 7450 | { |
| 7451 | auto&& __inner = _M_get_inner(); |
| 7452 | if (std::get<1>(_M_inner_it) != ranges::end(__inner)) |
| 7453 | break; |
| 7454 | |
| 7455 | if (++_M_get_outer() == ranges::end(_M_parent->_M_base)) |
| 7456 | { |
| 7457 | if constexpr (_S_ref_is_glvalue) |
| 7458 | _M_inner_it.template emplace<0>(); |
| 7459 | break; |
| 7460 | } |
| 7461 | |
| 7462 | _M_inner_it.template emplace<0>(ranges::begin(_M_parent->_M_pattern)); |
| 7463 | } |
| 7464 | } |
| 7465 | } |
| 7466 | |
| 7467 | static auto |
| 7468 | _S_iter_concept() |
| 7469 | { |
| 7470 | if constexpr (_S_ref_is_glvalue |
| 7471 | && bidirectional_range<_Base> |
| 7472 | && __detail::__bidirectional_common<_InnerBase> |
| 7473 | && __detail::__bidirectional_common<_PatternBase>) |
| 7474 | return bidirectional_iterator_tag{}; |
| 7475 | else if constexpr (_S_ref_is_glvalue |
| 7476 | && forward_range<_Base> |
| 7477 | && forward_range<_InnerBase>) |
| 7478 | return forward_iterator_tag{}; |
| 7479 | else |
| 7480 | return input_iterator_tag{}; |
| 7481 | } |
| 7482 | |
| 7483 | friend join_with_view; |
| 7484 | |
| 7485 | public: |
| 7486 | using iterator_concept = decltype(_S_iter_concept()); |
| 7487 | // iterator_category defined in join_with_view::__iter_cat |
| 7488 | using value_type = common_type_t<iter_value_t<_InnerIter>, |
| 7489 | iter_value_t<_PatternIter>>; |
| 7490 | using difference_type = common_type_t<iter_difference_t<_OuterIter>, |
| 7491 | iter_difference_t<_InnerIter>, |
| 7492 | iter_difference_t<_PatternIter>>; |
| 7493 | |
| 7494 | _Iterator() = default; |
| 7495 | |
| 7496 | constexpr |
| 7497 | _Iterator(_Iterator<!_Const> __i) |
| 7498 | requires _Const |
| 7499 | && convertible_to<iterator_t<_Vp>, _OuterIter> |
| 7500 | && convertible_to<iterator_t<_InnerRange>, _InnerIter> |
| 7501 | && convertible_to<iterator_t<_Pattern>, _PatternIter> |
| 7502 | : _M_parent(__i._M_parent), |
| 7503 | _M_outer_it(std::move(__i._M_outer_it)) |
| 7504 | { |
| 7505 | if (__i._M_inner_it.index() == 0) |
| 7506 | _M_inner_it.template emplace<0>(std::get<0>(std::move(__i._M_inner_it))); |
| 7507 | else |
| 7508 | _M_inner_it.template emplace<1>(std::get<1>(std::move(__i._M_inner_it))); |
| 7509 | } |
| 7510 | |
| 7511 | constexpr common_reference_t<iter_reference_t<_InnerIter>, |
| 7512 | iter_reference_t<_PatternIter>> |
| 7513 | operator*() const |
| 7514 | { |
| 7515 | if (_M_inner_it.index() == 0) |
| 7516 | return *std::get<0>(_M_inner_it); |
| 7517 | else |
| 7518 | return *std::get<1>(_M_inner_it); |
| 7519 | } |
| 7520 | |
| 7521 | constexpr _Iterator& |
| 7522 | operator++() |
| 7523 | { |
| 7524 | if (_M_inner_it.index() == 0) |
| 7525 | ++std::get<0>(_M_inner_it); |
| 7526 | else |
| 7527 | ++std::get<1>(_M_inner_it); |
| 7528 | _M_satisfy(); |
| 7529 | return *this; |
| 7530 | } |
| 7531 | |
| 7532 | constexpr void |
| 7533 | operator++(int) |
| 7534 | { ++*this; } |
| 7535 | |
| 7536 | constexpr _Iterator |
| 7537 | operator++(int) |
| 7538 | requires _S_ref_is_glvalue |
| 7539 | && forward_iterator<_OuterIter> && forward_iterator<_InnerIter> |
| 7540 | { |
| 7541 | _Iterator __tmp = *this; |
| 7542 | ++*this; |
| 7543 | return __tmp; |
| 7544 | } |
| 7545 | |
| 7546 | constexpr _Iterator& |
| 7547 | operator--() |
| 7548 | requires _S_ref_is_glvalue |
| 7549 | && bidirectional_range<_Base> |
| 7550 | && __detail::__bidirectional_common<_InnerBase> |
| 7551 | && __detail::__bidirectional_common<_PatternBase> |
| 7552 | { |
| 7553 | if (_M_outer_it == ranges::end(_M_parent->_M_base)) |
| 7554 | { |
| 7555 | auto&& __inner = *--_M_outer_it; |
| 7556 | _M_inner_it.template emplace<1>(ranges::end(__inner)); |
| 7557 | } |
| 7558 | |
| 7559 | while (true) |
| 7560 | { |
| 7561 | if (_M_inner_it.index() == 0) |
| 7562 | { |
| 7563 | auto& __it = std::get<0>(_M_inner_it); |
| 7564 | if (__it == ranges::begin(_M_parent->_M_pattern)) |
| 7565 | { |
| 7566 | auto&& __inner = *--_M_outer_it; |
| 7567 | _M_inner_it.template emplace<1>(ranges::end(__inner)); |
| 7568 | } |
| 7569 | else |
| 7570 | break; |
| 7571 | } |
| 7572 | else |
| 7573 | { |
| 7574 | auto& __it = std::get<1>(_M_inner_it); |
| 7575 | auto&& __inner = *_M_outer_it; |
| 7576 | if (__it == ranges::begin(__inner)) |
| 7577 | _M_inner_it.template emplace<0>(ranges::end(_M_parent->_M_pattern)); |
| 7578 | else |
| 7579 | break; |
| 7580 | } |
| 7581 | } |
| 7582 | |
| 7583 | if (_M_inner_it.index() == 0) |
| 7584 | --std::get<0>(_M_inner_it); |
| 7585 | else |
| 7586 | --std::get<1>(_M_inner_it); |
| 7587 | return *this; |
| 7588 | } |
| 7589 | |
| 7590 | constexpr _Iterator |
| 7591 | operator--(int) |
| 7592 | requires _S_ref_is_glvalue && bidirectional_range<_Base> |
| 7593 | && __detail::__bidirectional_common<_InnerBase> |
| 7594 | && __detail::__bidirectional_common<_PatternBase> |
| 7595 | { |
| 7596 | _Iterator __tmp = *this; |
| 7597 | --*this; |
| 7598 | return __tmp; |
| 7599 | } |
| 7600 | |
| 7601 | friend constexpr bool |
| 7602 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 7603 | requires _S_ref_is_glvalue |
| 7604 | && forward_range<_Base> && equality_comparable<_InnerIter> |
| 7605 | { return __x._M_outer_it == __y._M_outer_it && __x._M_inner_it ==__y._M_inner_it; } |
| 7606 | |
| 7607 | friend constexpr common_reference_t<iter_rvalue_reference_t<_InnerIter>, |
| 7608 | iter_rvalue_reference_t<_PatternIter>> |
| 7609 | iter_move(const _Iterator& __x) |
| 7610 | { |
| 7611 | if (__x._M_inner_it.index() == 0) |
| 7612 | return ranges::iter_move(std::get<0>(__x._M_inner_it)); |
| 7613 | else |
| 7614 | return ranges::iter_move(std::get<1>(__x._M_inner_it)); |
| 7615 | } |
| 7616 | |
| 7617 | friend constexpr void |
| 7618 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 7619 | requires indirectly_swappable<_InnerIter, _PatternIter> |
| 7620 | { |
| 7621 | if (__x._M_inner_it.index() == 0) |
| 7622 | { |
| 7623 | if (__y._M_inner_it.index() == 0) |
| 7624 | ranges::iter_swap(std::get<0>(__x._M_inner_it), std::get<0>(__y._M_inner_it)); |
| 7625 | else |
| 7626 | ranges::iter_swap(std::get<0>(__x._M_inner_it), std::get<1>(__y._M_inner_it)); |
| 7627 | } |
| 7628 | else |
| 7629 | { |
| 7630 | if (__y._M_inner_it.index() == 0) |
| 7631 | ranges::iter_swap(std::get<1>(__x._M_inner_it), std::get<0>(__y._M_inner_it)); |
| 7632 | else |
| 7633 | ranges::iter_swap(std::get<1>(__x._M_inner_it), std::get<1>(__y._M_inner_it)); |
| 7634 | } |
| 7635 | } |
| 7636 | }; |
| 7637 | |
| 7638 | template<input_range _Vp, forward_range _Pattern> |
| 7639 | requires view<_Vp> && view<_Pattern> |
| 7640 | && input_range<range_reference_t<_Vp>> |
| 7641 | && __detail::__compatible_joinable_ranges<range_reference_t<_Vp>, _Pattern> |
| 7642 | template<bool _Const> |
| 7643 | class join_with_view<_Vp, _Pattern>::_Sentinel |
| 7644 | { |
| 7645 | using _Parent = __detail::__maybe_const_t<_Const, join_with_view>; |
| 7646 | using _Base = join_with_view::_Base<_Const>; |
| 7647 | |
| 7648 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 7649 | |
| 7650 | constexpr explicit |
| 7651 | _Sentinel(_Parent& __parent) |
| 7652 | : _M_end(ranges::end(__parent._M_base)) |
| 7653 | { } |
| 7654 | |
| 7655 | friend join_with_view; |
| 7656 | |
| 7657 | public: |
| 7658 | _Sentinel() = default; |
| 7659 | |
| 7660 | constexpr |
| 7661 | _Sentinel(_Sentinel<!_Const> __s) |
| 7662 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 7663 | : _M_end(std::move(__s._M_end)) |
| 7664 | { } |
| 7665 | |
| 7666 | template<bool _OtherConst> |
| 7667 | requires sentinel_for<sentinel_t<_Base>, |
| 7668 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vp>>> |
| 7669 | friend constexpr bool |
| 7670 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 7671 | { return __x._M_get_outer() == __y._M_end; } |
| 7672 | }; |
| 7673 | |
| 7674 | namespace views |
| 7675 | { |
| 7676 | namespace __detail |
| 7677 | { |
| 7678 | template<typename _Range, typename _Pattern> |
| 7679 | concept __can_join_with_view |
| 7680 | = requires { join_with_view(std::declval<_Range>(), std::declval<_Pattern>()); }; |
| 7681 | } // namespace __detail |
| 7682 | |
| 7683 | struct _JoinWith : __adaptor::_RangeAdaptor<_JoinWith> |
| 7684 | { |
| 7685 | template<viewable_range _Range, typename _Pattern> |
| 7686 | requires __detail::__can_join_with_view<_Range, _Pattern> |
| 7687 | constexpr auto |
| 7688 | operator() [[nodiscard]] (_Range&& __r, _Pattern&& __f) const |
| 7689 | { |
| 7690 | return join_with_view(std::forward<_Range>(__r), std::forward<_Pattern>(__f)); |
| 7691 | } |
| 7692 | |
| 7693 | using _RangeAdaptor<_JoinWith>::operator(); |
| 7694 | static constexpr int _S_arity = 2; |
| 7695 | template<typename _Pattern> |
| 7696 | static constexpr bool _S_has_simple_extra_args |
| 7697 | = _LazySplit::_S_has_simple_extra_args<_Pattern>; |
| 7698 | }; |
| 7699 | |
| 7700 | inline constexpr _JoinWith join_with; |
| 7701 | } // namespace views |
| 7702 | #endif // __cpp_lib_ranges_join_with |
| 7703 | |
| 7704 | #ifdef __cpp_lib_ranges_repeat // C++ >= 23 |
| 7705 | template<move_constructible _Tp, semiregular _Bound = unreachable_sentinel_t> |
| 7706 | requires is_object_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>> |
| 7707 | && (__detail::__is_integer_like<_Bound> || same_as<_Bound, unreachable_sentinel_t>) |
| 7708 | class repeat_view : public view_interface<repeat_view<_Tp, _Bound>> |
| 7709 | { |
| 7710 | __detail::__box<_Tp> _M_value; |
| 7711 | [[no_unique_address]] _Bound _M_bound = _Bound(); |
| 7712 | |
| 7713 | struct _Iterator; |
| 7714 | |
| 7715 | template<typename _Range> |
| 7716 | friend constexpr auto |
| 7717 | views::__detail::__take_of_repeat_view(_Range&&, range_difference_t<_Range>); |
| 7718 | |
| 7719 | template<typename _Range> |
| 7720 | friend constexpr auto |
| 7721 | views::__detail::__drop_of_repeat_view(_Range&&, range_difference_t<_Range>); |
| 7722 | |
| 7723 | public: |
| 7724 | repeat_view() requires default_initializable<_Tp> = default; |
| 7725 | |
| 7726 | constexpr explicit |
| 7727 | repeat_view(const _Tp& __value, _Bound __bound = _Bound()) |
| 7728 | requires copy_constructible<_Tp> |
| 7729 | : _M_value(__value), _M_bound(__bound) |
| 7730 | { |
| 7731 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 7732 | __glibcxx_assert(__bound >= 0); |
| 7733 | } |
| 7734 | |
| 7735 | constexpr explicit |
| 7736 | repeat_view(_Tp&& __value, _Bound __bound = _Bound()) |
| 7737 | : _M_value(std::move(__value)), _M_bound(__bound) |
| 7738 | { } |
| 7739 | |
| 7740 | template<typename... _Args, typename... _BoundArgs> |
| 7741 | requires constructible_from<_Tp, _Args...> |
| 7742 | && constructible_from<_Bound, _BoundArgs...> |
| 7743 | constexpr explicit |
| 7744 | repeat_view(piecewise_construct_t, |
| 7745 | tuple<_Args...> __args, |
| 7746 | tuple<_BoundArgs...> __bound_args = tuple<>{}) |
| 7747 | : _M_value(std::make_from_tuple<_Tp>(std::move(__args))), |
| 7748 | _M_bound(std::make_from_tuple<_Bound>(std::move(__bound_args))) |
| 7749 | { } |
| 7750 | |
| 7751 | constexpr _Iterator |
| 7752 | begin() const |
| 7753 | { return _Iterator(std::__addressof(*_M_value)); } |
| 7754 | |
| 7755 | constexpr _Iterator |
| 7756 | end() const requires (!same_as<_Bound, unreachable_sentinel_t>) |
| 7757 | { return _Iterator(std::__addressof(*_M_value), _M_bound); } |
| 7758 | |
| 7759 | constexpr unreachable_sentinel_t |
| 7760 | end() const noexcept |
| 7761 | { return unreachable_sentinel; } |
| 7762 | |
| 7763 | constexpr auto |
| 7764 | size() const requires (!same_as<_Bound, unreachable_sentinel_t>) |
| 7765 | { return __detail::__to_unsigned_like(_M_bound); } |
| 7766 | }; |
| 7767 | |
| 7768 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 7769 | // 4053. Unary call to std::views::repeat does not decay the argument |
| 7770 | template<typename _Tp, typename _Bound = unreachable_sentinel_t> |
| 7771 | repeat_view(_Tp, _Bound = _Bound()) -> repeat_view<_Tp, _Bound>; |
| 7772 | |
| 7773 | template<move_constructible _Tp, semiregular _Bound> |
| 7774 | requires is_object_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>> |
| 7775 | && (__detail::__is_integer_like<_Bound> || same_as<_Bound, unreachable_sentinel_t>) |
| 7776 | class repeat_view<_Tp, _Bound>::_Iterator |
| 7777 | { |
| 7778 | using __index_type |
| 7779 | = __conditional_t<same_as<_Bound, unreachable_sentinel_t>, ptrdiff_t, _Bound>; |
| 7780 | |
| 7781 | const _Tp* _M_value = nullptr; |
| 7782 | __index_type _M_current = __index_type(); |
| 7783 | |
| 7784 | constexpr explicit |
| 7785 | _Iterator(const _Tp* __value, __index_type __bound = __index_type()) |
| 7786 | : _M_value(__value), _M_current(__bound) |
| 7787 | { |
| 7788 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 7789 | __glibcxx_assert(__bound >= 0); |
| 7790 | } |
| 7791 | |
| 7792 | friend repeat_view; |
| 7793 | |
| 7794 | public: |
| 7795 | using iterator_concept = random_access_iterator_tag; |
| 7796 | using iterator_category = random_access_iterator_tag; |
| 7797 | using value_type = _Tp; |
| 7798 | using difference_type = __conditional_t<__detail::__is_signed_integer_like<__index_type>, |
| 7799 | __index_type, |
| 7800 | __detail::__iota_diff_t<__index_type>>; |
| 7801 | |
| 7802 | _Iterator() = default; |
| 7803 | |
| 7804 | constexpr const _Tp& |
| 7805 | operator*() const noexcept |
| 7806 | { return *_M_value; } |
| 7807 | |
| 7808 | constexpr _Iterator& |
| 7809 | operator++() |
| 7810 | { |
| 7811 | ++_M_current; |
| 7812 | return *this; |
| 7813 | } |
| 7814 | |
| 7815 | constexpr _Iterator |
| 7816 | operator++(int) |
| 7817 | { |
| 7818 | auto __tmp = *this; |
| 7819 | ++*this; |
| 7820 | return __tmp; |
| 7821 | } |
| 7822 | |
| 7823 | constexpr _Iterator& |
| 7824 | operator--() |
| 7825 | { |
| 7826 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 7827 | __glibcxx_assert(_M_current > 0); |
| 7828 | --_M_current; |
| 7829 | return *this; |
| 7830 | } |
| 7831 | |
| 7832 | constexpr _Iterator |
| 7833 | operator--(int) |
| 7834 | { |
| 7835 | auto __tmp = *this; |
| 7836 | --*this; |
| 7837 | return __tmp; |
| 7838 | } |
| 7839 | |
| 7840 | constexpr _Iterator& |
| 7841 | operator+=(difference_type __n) |
| 7842 | { |
| 7843 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 7844 | __glibcxx_assert(_M_current + __n >= 0); |
| 7845 | _M_current += __n; |
| 7846 | return *this; |
| 7847 | } |
| 7848 | |
| 7849 | constexpr _Iterator& |
| 7850 | operator-=(difference_type __n) |
| 7851 | { |
| 7852 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 7853 | __glibcxx_assert(_M_current - __n >= 0); |
| 7854 | _M_current -= __n; |
| 7855 | return *this; |
| 7856 | } |
| 7857 | |
| 7858 | constexpr const _Tp& |
| 7859 | operator[](difference_type __n) const noexcept |
| 7860 | { return *(*this + __n); } |
| 7861 | |
| 7862 | friend constexpr bool |
| 7863 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 7864 | { return __x._M_current == __y._M_current; } |
| 7865 | |
| 7866 | friend constexpr auto |
| 7867 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 7868 | { return __x._M_current <=> __y._M_current; } |
| 7869 | |
| 7870 | friend constexpr _Iterator |
| 7871 | operator+(_Iterator __i, difference_type __n) |
| 7872 | { |
| 7873 | __i += __n; |
| 7874 | return __i; |
| 7875 | } |
| 7876 | |
| 7877 | friend constexpr _Iterator |
| 7878 | operator+(difference_type __n, _Iterator __i) |
| 7879 | { return __i + __n; } |
| 7880 | |
| 7881 | friend constexpr _Iterator |
| 7882 | operator-(_Iterator __i, difference_type __n) |
| 7883 | { |
| 7884 | __i -= __n; |
| 7885 | return __i; |
| 7886 | } |
| 7887 | |
| 7888 | friend constexpr difference_type |
| 7889 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 7890 | { |
| 7891 | return (static_cast<difference_type>(__x._M_current) |
| 7892 | - static_cast<difference_type>(__y._M_current)); |
| 7893 | } |
| 7894 | }; |
| 7895 | |
| 7896 | namespace views |
| 7897 | { |
| 7898 | namespace __detail |
| 7899 | { |
| 7900 | template<typename _Tp, typename _Bound> |
| 7901 | inline constexpr bool __is_repeat_view<repeat_view<_Tp, _Bound>> = true; |
| 7902 | |
| 7903 | template<typename _Tp> |
| 7904 | concept __can_repeat_view |
| 7905 | = requires { repeat_view(std::declval<_Tp>()); }; |
| 7906 | |
| 7907 | template<typename _Tp, typename _Bound> |
| 7908 | concept __can_bounded_repeat_view |
| 7909 | = requires { repeat_view(std::declval<_Tp>(), std::declval<_Bound>()); }; |
| 7910 | } |
| 7911 | |
| 7912 | struct _Repeat |
| 7913 | { |
| 7914 | template<typename _Tp> |
| 7915 | requires __detail::__can_repeat_view<_Tp> |
| 7916 | constexpr auto |
| 7917 | operator() [[nodiscard]] (_Tp&& __value) const |
| 7918 | { |
| 7919 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 7920 | // 4054. Repeating a repeat_view should repeat the view |
| 7921 | return repeat_view<decay_t<_Tp>>(std::forward<_Tp>(__value)); |
| 7922 | } |
| 7923 | |
| 7924 | template<typename _Tp, typename _Bound> |
| 7925 | requires __detail::__can_bounded_repeat_view<_Tp, _Bound> |
| 7926 | constexpr auto |
| 7927 | operator() [[nodiscard]] (_Tp&& __value, _Bound __bound) const |
| 7928 | { return repeat_view(std::forward<_Tp>(__value), __bound); } |
| 7929 | }; |
| 7930 | |
| 7931 | inline constexpr _Repeat repeat; |
| 7932 | |
| 7933 | namespace __detail |
| 7934 | { |
| 7935 | template<typename _Range> |
| 7936 | constexpr auto |
| 7937 | __take_of_repeat_view(_Range&& __r, range_difference_t<_Range> __n) |
| 7938 | { |
| 7939 | using _Tp = remove_cvref_t<_Range>; |
| 7940 | static_assert(__is_repeat_view<_Tp>); |
| 7941 | if constexpr (sized_range<_Tp>) |
| 7942 | return views::repeat(*std::forward<_Range>(__r)._M_value, |
| 7943 | std::min(ranges::distance(__r), __n)); |
| 7944 | else |
| 7945 | return views::repeat(*std::forward<_Range>(__r)._M_value, __n); |
| 7946 | } |
| 7947 | |
| 7948 | template<typename _Range> |
| 7949 | constexpr auto |
| 7950 | __drop_of_repeat_view(_Range&& __r, range_difference_t<_Range> __n) |
| 7951 | { |
| 7952 | using _Tp = remove_cvref_t<_Range>; |
| 7953 | static_assert(__is_repeat_view<_Tp>); |
| 7954 | if constexpr (sized_range<_Tp>) |
| 7955 | { |
| 7956 | auto __sz = ranges::distance(__r); |
| 7957 | return views::repeat(*std::forward<_Range>(__r)._M_value, |
| 7958 | __sz - std::min(__sz, __n)); |
| 7959 | } |
| 7960 | else |
| 7961 | return __r; |
| 7962 | } |
| 7963 | } |
| 7964 | } |
| 7965 | #endif // __cpp_lib_ranges_repeat |
| 7966 | |
| 7967 | #ifdef __cpp_lib_ranges_stride // C++ >= 23 |
| 7968 | template<input_range _Vp> |
| 7969 | requires view<_Vp> |
| 7970 | class stride_view : public view_interface<stride_view<_Vp>> |
| 7971 | { |
| 7972 | _Vp _M_base; |
| 7973 | range_difference_t<_Vp> _M_stride; |
| 7974 | |
| 7975 | template<bool _Const> using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 7976 | |
| 7977 | template<bool _Const> |
| 7978 | struct __iter_cat |
| 7979 | { }; |
| 7980 | |
| 7981 | template<bool _Const> |
| 7982 | requires forward_range<_Base<_Const>> |
| 7983 | struct __iter_cat<_Const> |
| 7984 | { |
| 7985 | private: |
| 7986 | static auto |
| 7987 | _S_iter_cat() |
| 7988 | { |
| 7989 | using _Cat = typename iterator_traits<iterator_t<_Base<_Const>>>::iterator_category; |
| 7990 | if constexpr (derived_from<_Cat, random_access_iterator_tag>) |
| 7991 | return random_access_iterator_tag{}; |
| 7992 | else |
| 7993 | return _Cat{}; |
| 7994 | } |
| 7995 | public: |
| 7996 | using iterator_category = decltype(_S_iter_cat()); |
| 7997 | }; |
| 7998 | |
| 7999 | template<bool> class _Iterator; |
| 8000 | |
| 8001 | public: |
| 8002 | constexpr explicit |
| 8003 | stride_view(_Vp __base, range_difference_t<_Vp> __stride) |
| 8004 | : _M_base(std::move(__base)), _M_stride(__stride) |
| 8005 | { __glibcxx_assert(__stride > 0); } |
| 8006 | |
| 8007 | constexpr _Vp |
| 8008 | base() const& requires copy_constructible<_Vp> |
| 8009 | { return _M_base; } |
| 8010 | |
| 8011 | constexpr _Vp |
| 8012 | base() && |
| 8013 | { return std::move(_M_base); } |
| 8014 | |
| 8015 | constexpr range_difference_t<_Vp> |
| 8016 | stride() const noexcept |
| 8017 | { return _M_stride; } |
| 8018 | |
| 8019 | constexpr auto |
| 8020 | begin() requires (!__detail::__simple_view<_Vp>) |
| 8021 | { return _Iterator<false>(this, ranges::begin(_M_base)); } |
| 8022 | |
| 8023 | constexpr auto |
| 8024 | begin() const requires range<const _Vp> |
| 8025 | { return _Iterator<true>(this, ranges::begin(_M_base)); } |
| 8026 | |
| 8027 | constexpr auto |
| 8028 | end() requires (!__detail::__simple_view<_Vp>) |
| 8029 | { |
| 8030 | if constexpr (common_range<_Vp> && sized_range<_Vp> && forward_range<_Vp>) |
| 8031 | { |
| 8032 | auto __missing = (_M_stride - ranges::distance(_M_base) % _M_stride) % _M_stride; |
| 8033 | return _Iterator<false>(this, ranges::end(_M_base), __missing); |
| 8034 | } |
| 8035 | else if constexpr (common_range<_Vp> && !bidirectional_range<_Vp>) |
| 8036 | return _Iterator<false>(this, ranges::end(_M_base)); |
| 8037 | else |
| 8038 | return default_sentinel; |
| 8039 | } |
| 8040 | |
| 8041 | constexpr auto |
| 8042 | end() const requires range<const _Vp> |
| 8043 | { |
| 8044 | if constexpr (common_range<const _Vp> && sized_range<const _Vp> |
| 8045 | && forward_range<const _Vp>) |
| 8046 | { |
| 8047 | auto __missing = (_M_stride - ranges::distance(_M_base) % _M_stride) % _M_stride; |
| 8048 | return _Iterator<true>(this, ranges::end(_M_base), __missing); |
| 8049 | } |
| 8050 | else if constexpr (common_range<const _Vp> && !bidirectional_range<const _Vp>) |
| 8051 | return _Iterator<true>(this, ranges::end(_M_base)); |
| 8052 | else |
| 8053 | return default_sentinel; |
| 8054 | } |
| 8055 | |
| 8056 | constexpr auto |
| 8057 | size() requires sized_range<_Vp> |
| 8058 | { |
| 8059 | return __detail::__to_unsigned_like |
| 8060 | (__detail::__div_ceil(ranges::distance(_M_base), _M_stride)); |
| 8061 | } |
| 8062 | |
| 8063 | constexpr auto |
| 8064 | size() const requires sized_range<const _Vp> |
| 8065 | { |
| 8066 | return __detail::__to_unsigned_like |
| 8067 | (__detail::__div_ceil(ranges::distance(_M_base), _M_stride)); |
| 8068 | } |
| 8069 | }; |
| 8070 | |
| 8071 | template<typename _Range> |
| 8072 | stride_view(_Range&&, range_difference_t<_Range>) -> stride_view<views::all_t<_Range>>; |
| 8073 | |
| 8074 | template<typename _Vp> |
| 8075 | inline constexpr bool enable_borrowed_range<stride_view<_Vp>> |
| 8076 | = enable_borrowed_range<_Vp>; |
| 8077 | |
| 8078 | template<input_range _Vp> |
| 8079 | requires view<_Vp> |
| 8080 | template<bool _Const> |
| 8081 | class stride_view<_Vp>::_Iterator : public __iter_cat<_Const> |
| 8082 | { |
| 8083 | using _Parent = __detail::__maybe_const_t<_Const, stride_view>; |
| 8084 | using _Base = stride_view::_Base<_Const>; |
| 8085 | |
| 8086 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 8087 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 8088 | range_difference_t<_Base> _M_stride = 0; |
| 8089 | range_difference_t<_Base> _M_missing = 0; |
| 8090 | |
| 8091 | constexpr |
| 8092 | _Iterator(_Parent* __parent, iterator_t<_Base> __current, |
| 8093 | range_difference_t<_Base> __missing = 0) |
| 8094 | : _M_current(std::move(__current)), _M_end(ranges::end(__parent->_M_base)), |
| 8095 | _M_stride(__parent->_M_stride), _M_missing(__missing) |
| 8096 | { } |
| 8097 | |
| 8098 | static auto |
| 8099 | _S_iter_concept() |
| 8100 | { |
| 8101 | if constexpr (random_access_range<_Base>) |
| 8102 | return random_access_iterator_tag{}; |
| 8103 | else if constexpr (bidirectional_range<_Base>) |
| 8104 | return bidirectional_iterator_tag{}; |
| 8105 | else if constexpr (forward_range<_Base>) |
| 8106 | return forward_iterator_tag{}; |
| 8107 | else |
| 8108 | return input_iterator_tag{}; |
| 8109 | } |
| 8110 | |
| 8111 | friend stride_view; |
| 8112 | |
| 8113 | public: |
| 8114 | using difference_type = range_difference_t<_Base>; |
| 8115 | using value_type = range_value_t<_Base>; |
| 8116 | using iterator_concept = decltype(_S_iter_concept()); |
| 8117 | // iterator_category defined in stride_view::__iter_cat |
| 8118 | |
| 8119 | _Iterator() requires default_initializable<iterator_t<_Base>> = default; |
| 8120 | |
| 8121 | constexpr |
| 8122 | _Iterator(_Iterator<!_Const> __other) |
| 8123 | requires _Const |
| 8124 | && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 8125 | && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 8126 | : _M_current(std::move(__other._M_current)), _M_end(std::move(__other._M_end)), |
| 8127 | _M_stride(__other._M_stride), _M_missing(__other._M_missing) |
| 8128 | { } |
| 8129 | |
| 8130 | constexpr iterator_t<_Base> |
| 8131 | base() && |
| 8132 | { return std::move(_M_current); } |
| 8133 | |
| 8134 | constexpr const iterator_t<_Base>& |
| 8135 | base() const & noexcept |
| 8136 | { return _M_current; } |
| 8137 | |
| 8138 | constexpr decltype(auto) |
| 8139 | operator*() const |
| 8140 | { return *_M_current; } |
| 8141 | |
| 8142 | constexpr _Iterator& |
| 8143 | operator++() |
| 8144 | { |
| 8145 | __glibcxx_assert(_M_current != _M_end); |
| 8146 | _M_missing = ranges::advance(_M_current, _M_stride, _M_end); |
| 8147 | return *this; |
| 8148 | } |
| 8149 | |
| 8150 | constexpr void |
| 8151 | operator++(int) |
| 8152 | { ++*this; } |
| 8153 | |
| 8154 | constexpr _Iterator |
| 8155 | operator++(int) requires forward_range<_Base> |
| 8156 | { |
| 8157 | auto __tmp = *this; |
| 8158 | ++*this; |
| 8159 | return __tmp; |
| 8160 | } |
| 8161 | |
| 8162 | constexpr _Iterator& |
| 8163 | operator--() requires bidirectional_range<_Base> |
| 8164 | { |
| 8165 | ranges::advance(_M_current, _M_missing - _M_stride); |
| 8166 | _M_missing = 0; |
| 8167 | return *this; |
| 8168 | } |
| 8169 | |
| 8170 | constexpr _Iterator |
| 8171 | operator--(int) requires bidirectional_range<_Base> |
| 8172 | { |
| 8173 | auto __tmp = *this; |
| 8174 | --*this; |
| 8175 | return __tmp; |
| 8176 | } |
| 8177 | |
| 8178 | constexpr _Iterator& |
| 8179 | operator+=(difference_type __n) requires random_access_range<_Base> |
| 8180 | { |
| 8181 | if (__n > 0) |
| 8182 | { |
| 8183 | __glibcxx_assert(ranges::distance(_M_current, _M_end) > _M_stride * (__n - 1)); |
| 8184 | _M_missing = ranges::advance(_M_current, _M_stride * __n, _M_end); |
| 8185 | } |
| 8186 | else if (__n < 0) |
| 8187 | { |
| 8188 | ranges::advance(_M_current, _M_stride * __n + _M_missing); |
| 8189 | _M_missing = 0; |
| 8190 | } |
| 8191 | return *this; |
| 8192 | } |
| 8193 | |
| 8194 | constexpr _Iterator& |
| 8195 | operator-=(difference_type __n) requires random_access_range<_Base> |
| 8196 | { return *this += -__n; } |
| 8197 | |
| 8198 | constexpr decltype(auto) operator[](difference_type __n) const |
| 8199 | requires random_access_range<_Base> |
| 8200 | { return *(*this + __n); } |
| 8201 | |
| 8202 | friend constexpr bool |
| 8203 | operator==(const _Iterator& __x, default_sentinel_t) |
| 8204 | { return __x._M_current == __x._M_end; } |
| 8205 | |
| 8206 | friend constexpr bool |
| 8207 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 8208 | requires equality_comparable<iterator_t<_Base>> |
| 8209 | { return __x._M_current == __y._M_current; } |
| 8210 | |
| 8211 | friend constexpr bool |
| 8212 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 8213 | requires random_access_range<_Base> |
| 8214 | { return __x._M_current < __y._M_current; } |
| 8215 | |
| 8216 | friend constexpr bool |
| 8217 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 8218 | requires random_access_range<_Base> |
| 8219 | { return __y._M_current < __x._M_current; } |
| 8220 | |
| 8221 | friend constexpr bool |
| 8222 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 8223 | requires random_access_range<_Base> |
| 8224 | { return !(__y._M_current < __x._M_current); } |
| 8225 | |
| 8226 | friend constexpr bool |
| 8227 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 8228 | requires random_access_range<_Base> |
| 8229 | { return !(__x._M_current < __y._M_current); } |
| 8230 | |
| 8231 | friend constexpr auto |
| 8232 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 8233 | requires random_access_range<_Base> && three_way_comparable<iterator_t<_Base>> |
| 8234 | { return __x._M_current <=> __y._M_current; } |
| 8235 | |
| 8236 | friend constexpr _Iterator |
| 8237 | operator+(const _Iterator& __i, difference_type __n) |
| 8238 | requires random_access_range<_Base> |
| 8239 | { |
| 8240 | auto __r = __i; |
| 8241 | __r += __n; |
| 8242 | return __r; |
| 8243 | } |
| 8244 | |
| 8245 | friend constexpr _Iterator |
| 8246 | operator+(difference_type __n, const _Iterator& __i) |
| 8247 | requires random_access_range<_Base> |
| 8248 | { return __i + __n; } |
| 8249 | |
| 8250 | friend constexpr _Iterator |
| 8251 | operator-(const _Iterator& __i, difference_type __n) |
| 8252 | requires random_access_range<_Base> |
| 8253 | { |
| 8254 | auto __r = __i; |
| 8255 | __r -= __n; |
| 8256 | return __r; |
| 8257 | } |
| 8258 | |
| 8259 | friend constexpr difference_type |
| 8260 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 8261 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 8262 | { |
| 8263 | auto __n = __x._M_current - __y._M_current; |
| 8264 | if constexpr (forward_range<_Base>) |
| 8265 | return (__n + __x._M_missing - __y._M_missing) / __x._M_stride; |
| 8266 | else if (__n < 0) |
| 8267 | return -__detail::__div_ceil(-__n, __x._M_stride); |
| 8268 | else |
| 8269 | return __detail::__div_ceil(__n, __x._M_stride); |
| 8270 | } |
| 8271 | |
| 8272 | friend constexpr difference_type |
| 8273 | operator-(default_sentinel_t __y, const _Iterator& __x) |
| 8274 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 8275 | { return __detail::__div_ceil(__x._M_end - __x._M_current, __x._M_stride); } |
| 8276 | |
| 8277 | friend constexpr difference_type |
| 8278 | operator-(const _Iterator& __x, default_sentinel_t __y) |
| 8279 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 8280 | { return -(__y - __x); } |
| 8281 | |
| 8282 | friend constexpr range_rvalue_reference_t<_Base> |
| 8283 | iter_move(const _Iterator& __i) |
| 8284 | noexcept(noexcept(ranges::iter_move(__i._M_current))) |
| 8285 | { return ranges::iter_move(__i._M_current); } |
| 8286 | |
| 8287 | friend constexpr void |
| 8288 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 8289 | noexcept(noexcept(ranges::iter_swap(__x._M_current, __y._M_current))) |
| 8290 | requires indirectly_swappable<iterator_t<_Base>> |
| 8291 | { ranges::iter_swap(__x._M_current, __y._M_current); } |
| 8292 | }; |
| 8293 | |
| 8294 | namespace views |
| 8295 | { |
| 8296 | namespace __detail |
| 8297 | { |
| 8298 | template<typename _Range, typename _Dp> |
| 8299 | concept __can_stride_view |
| 8300 | = requires { stride_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 8301 | } |
| 8302 | |
| 8303 | struct _Stride : __adaptor::_RangeAdaptor<_Stride> |
| 8304 | { |
| 8305 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 8306 | requires __detail::__can_stride_view<_Range, _Dp> |
| 8307 | constexpr auto |
| 8308 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 8309 | { return stride_view(std::forward<_Range>(__r), __n); } |
| 8310 | |
| 8311 | using __adaptor::_RangeAdaptor<_Stride>::operator(); |
| 8312 | static constexpr int _S_arity = 2; |
| 8313 | static constexpr bool _S_has_simple_extra_args = true; |
| 8314 | }; |
| 8315 | |
| 8316 | inline constexpr _Stride stride; |
| 8317 | } |
| 8318 | #endif // __cpp_lib_ranges_stride |
| 8319 | |
| 8320 | #ifdef __cpp_lib_ranges_cartesian_product // C++ >= 23 |
| 8321 | namespace __detail |
| 8322 | { |
| 8323 | template<bool _Const, typename _First, typename... _Vs> |
| 8324 | concept __cartesian_product_is_random_access |
| 8325 | = (random_access_range<__maybe_const_t<_Const, _First>> |
| 8326 | && ... |
| 8327 | && (random_access_range<__maybe_const_t<_Const, _Vs>> |
| 8328 | && sized_range<__maybe_const_t<_Const, _Vs>>)); |
| 8329 | |
| 8330 | template<typename _Range> |
| 8331 | concept __cartesian_product_common_arg |
| 8332 | = common_range<_Range> || (sized_range<_Range> && random_access_range<_Range>); |
| 8333 | |
| 8334 | template<bool _Const, typename _First, typename... _Vs> |
| 8335 | concept __cartesian_product_is_bidirectional |
| 8336 | = (bidirectional_range<__maybe_const_t<_Const, _First>> |
| 8337 | && ... |
| 8338 | && (bidirectional_range<__maybe_const_t<_Const, _Vs>> |
| 8339 | && __cartesian_product_common_arg<__maybe_const_t<_Const, _Vs>>)); |
| 8340 | |
| 8341 | template<typename _First, typename... _Vs> |
| 8342 | concept __cartesian_product_is_common = __cartesian_product_common_arg<_First>; |
| 8343 | |
| 8344 | template<typename... _Vs> |
| 8345 | concept __cartesian_product_is_sized = (sized_range<_Vs> && ...); |
| 8346 | |
| 8347 | template<bool _Const, template<typename> class FirstSent, typename _First, typename... _Vs> |
| 8348 | concept __cartesian_is_sized_sentinel |
| 8349 | = (sized_sentinel_for<FirstSent<__maybe_const_t<_Const, _First>>, |
| 8350 | iterator_t<__maybe_const_t<_Const, _First>>> |
| 8351 | && ... |
| 8352 | && (sized_range<__maybe_const_t<_Const, _Vs>> |
| 8353 | && sized_sentinel_for<iterator_t<__maybe_const_t<_Const, _Vs>>, |
| 8354 | iterator_t<__maybe_const_t<_Const, _Vs>>>)); |
| 8355 | |
| 8356 | template<__cartesian_product_common_arg _Range> |
| 8357 | constexpr auto |
| 8358 | __cartesian_common_arg_end(_Range& __r) |
| 8359 | { |
| 8360 | if constexpr (common_range<_Range>) |
| 8361 | return ranges::end(__r); |
| 8362 | else |
| 8363 | return ranges::begin(__r) + ranges::distance(__r); |
| 8364 | } |
| 8365 | } // namespace __detail |
| 8366 | |
| 8367 | template<input_range _First, forward_range... _Vs> |
| 8368 | requires (view<_First> && ... && view<_Vs>) |
| 8369 | class cartesian_product_view : public view_interface<cartesian_product_view<_First, _Vs...>> |
| 8370 | { |
| 8371 | tuple<_First, _Vs...> _M_bases; |
| 8372 | |
| 8373 | template<bool> class _Iterator; |
| 8374 | |
| 8375 | static auto |
| 8376 | _S_difference_type() |
| 8377 | { |
| 8378 | // TODO: Implement the recommended practice of using the smallest |
| 8379 | // sufficiently wide type according to the maximum sizes of the |
| 8380 | // underlying ranges? |
| 8381 | return common_type_t<ptrdiff_t, |
| 8382 | range_difference_t<_First>, |
| 8383 | range_difference_t<_Vs>...>{}; |
| 8384 | } |
| 8385 | |
| 8386 | public: |
| 8387 | cartesian_product_view() = default; |
| 8388 | |
| 8389 | constexpr explicit |
| 8390 | cartesian_product_view(_First __first, _Vs... __rest) |
| 8391 | : _M_bases(std::move(__first), std::move(__rest)...) |
| 8392 | { } |
| 8393 | |
| 8394 | constexpr _Iterator<false> |
| 8395 | begin() requires (!__detail::__simple_view<_First> || ... || !__detail::__simple_view<_Vs>) |
| 8396 | { return _Iterator<false>(*this, __detail::__tuple_transform(ranges::begin, _M_bases)); } |
| 8397 | |
| 8398 | constexpr _Iterator<true> |
| 8399 | begin() const requires (range<const _First> && ... && range<const _Vs>) |
| 8400 | { return _Iterator<true>(*this, __detail::__tuple_transform(ranges::begin, _M_bases)); } |
| 8401 | |
| 8402 | constexpr _Iterator<false> |
| 8403 | end() requires ((!__detail::__simple_view<_First> || ... || !__detail::__simple_view<_Vs>) |
| 8404 | && __detail::__cartesian_product_is_common<_First, _Vs...>) |
| 8405 | { |
| 8406 | auto __its = [this]<size_t... _Is>(index_sequence<_Is...>) { |
| 8407 | using _Ret = tuple<iterator_t<_First>, iterator_t<_Vs>...>; |
| 8408 | bool __empty_tail = (ranges::empty(std::get<1 + _Is>(_M_bases)) || ...); |
| 8409 | auto& __first = std::get<0>(_M_bases); |
| 8410 | return _Ret{(__empty_tail |
| 8411 | ? ranges::begin(__first) |
| 8412 | : __detail::__cartesian_common_arg_end(__first)), |
| 8413 | ranges::begin(std::get<1 + _Is>(_M_bases))...}; |
| 8414 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 8415 | |
| 8416 | return _Iterator<false>{*this, std::move(__its)}; |
| 8417 | } |
| 8418 | |
| 8419 | constexpr _Iterator<true> |
| 8420 | end() const requires __detail::__cartesian_product_is_common<const _First, const _Vs...> |
| 8421 | { |
| 8422 | auto __its = [this]<size_t... _Is>(index_sequence<_Is...>) { |
| 8423 | using _Ret = tuple<iterator_t<const _First>, iterator_t<const _Vs>...>; |
| 8424 | bool __empty_tail = (ranges::empty(std::get<1 + _Is>(_M_bases)) || ...); |
| 8425 | auto& __first = std::get<0>(_M_bases); |
| 8426 | return _Ret{(__empty_tail |
| 8427 | ? ranges::begin(__first) |
| 8428 | : __detail::__cartesian_common_arg_end(__first)), |
| 8429 | ranges::begin(std::get<1 + _Is>(_M_bases))...}; |
| 8430 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 8431 | |
| 8432 | return _Iterator<true>{*this, std::move(__its)}; |
| 8433 | } |
| 8434 | |
| 8435 | constexpr default_sentinel_t |
| 8436 | end() const noexcept |
| 8437 | { return default_sentinel; } |
| 8438 | |
| 8439 | constexpr auto |
| 8440 | size() requires __detail::__cartesian_product_is_sized<_First, _Vs...> |
| 8441 | { |
| 8442 | using _ST = __detail::__make_unsigned_like_t<decltype(_S_difference_type())>; |
| 8443 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8444 | auto __size = static_cast<_ST>(1); |
| 8445 | #ifdef _GLIBCXX_ASSERTIONS |
| 8446 | if constexpr (integral<_ST>) |
| 8447 | { |
| 8448 | bool __overflow |
| 8449 | = (__builtin_mul_overflow(__size, |
| 8450 | static_cast<_ST>(ranges::size(std::get<_Is>(_M_bases))), |
| 8451 | &__size) |
| 8452 | || ...); |
| 8453 | __glibcxx_assert(!__overflow); |
| 8454 | } |
| 8455 | else |
| 8456 | #endif |
| 8457 | __size = (static_cast<_ST>(ranges::size(std::get<_Is>(_M_bases))) * ...); |
| 8458 | return __size; |
| 8459 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8460 | } |
| 8461 | |
| 8462 | constexpr auto |
| 8463 | size() const requires __detail::__cartesian_product_is_sized<const _First, const _Vs...> |
| 8464 | { |
| 8465 | using _ST = __detail::__make_unsigned_like_t<decltype(_S_difference_type())>; |
| 8466 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8467 | auto __size = static_cast<_ST>(1); |
| 8468 | #ifdef _GLIBCXX_ASSERTIONS |
| 8469 | if constexpr (integral<_ST>) |
| 8470 | { |
| 8471 | bool __overflow |
| 8472 | = (__builtin_mul_overflow(__size, |
| 8473 | static_cast<_ST>(ranges::size(std::get<_Is>(_M_bases))), |
| 8474 | &__size) |
| 8475 | || ...); |
| 8476 | __glibcxx_assert(!__overflow); |
| 8477 | } |
| 8478 | else |
| 8479 | #endif |
| 8480 | __size = (static_cast<_ST>(ranges::size(std::get<_Is>(_M_bases))) * ...); |
| 8481 | return __size; |
| 8482 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8483 | } |
| 8484 | }; |
| 8485 | |
| 8486 | template<typename... _Vs> |
| 8487 | cartesian_product_view(_Vs&&...) -> cartesian_product_view<views::all_t<_Vs>...>; |
| 8488 | |
| 8489 | template<input_range _First, forward_range... _Vs> |
| 8490 | requires (view<_First> && ... && view<_Vs>) |
| 8491 | template<bool _Const> |
| 8492 | class cartesian_product_view<_First, _Vs...>::_Iterator |
| 8493 | { |
| 8494 | using _Parent = __maybe_const_t<_Const, cartesian_product_view>; |
| 8495 | _Parent* _M_parent = nullptr; |
| 8496 | tuple<iterator_t<__maybe_const_t<_Const, _First>>, |
| 8497 | iterator_t<__maybe_const_t<_Const, _Vs>>...> _M_current; |
| 8498 | |
| 8499 | constexpr |
| 8500 | _Iterator(_Parent& __parent, decltype(_M_current) __current) |
| 8501 | : _M_parent(std::__addressof(__parent)), |
| 8502 | _M_current(std::move(__current)) |
| 8503 | { } |
| 8504 | |
| 8505 | static auto |
| 8506 | _S_iter_concept() |
| 8507 | { |
| 8508 | if constexpr (__detail::__cartesian_product_is_random_access<_Const, _First, _Vs...>) |
| 8509 | return random_access_iterator_tag{}; |
| 8510 | else if constexpr (__detail::__cartesian_product_is_bidirectional<_Const, _First, _Vs...>) |
| 8511 | return bidirectional_iterator_tag{}; |
| 8512 | else if constexpr (forward_range<__maybe_const_t<_Const, _First>>) |
| 8513 | return forward_iterator_tag{}; |
| 8514 | else |
| 8515 | return input_iterator_tag{}; |
| 8516 | } |
| 8517 | |
| 8518 | friend cartesian_product_view; |
| 8519 | |
| 8520 | public: |
| 8521 | using iterator_category = input_iterator_tag; |
| 8522 | using iterator_concept = decltype(_S_iter_concept()); |
| 8523 | using value_type |
| 8524 | = tuple<range_value_t<__maybe_const_t<_Const, _First>>, |
| 8525 | range_value_t<__maybe_const_t<_Const, _Vs>>...>; |
| 8526 | using reference |
| 8527 | = tuple<range_reference_t<__maybe_const_t<_Const, _First>>, |
| 8528 | range_reference_t<__maybe_const_t<_Const, _Vs>>...>; |
| 8529 | using difference_type = decltype(cartesian_product_view::_S_difference_type()); |
| 8530 | |
| 8531 | _Iterator() = default; |
| 8532 | |
| 8533 | constexpr |
| 8534 | _Iterator(_Iterator<!_Const> __i) |
| 8535 | requires _Const |
| 8536 | && (convertible_to<iterator_t<_First>, iterator_t<const _First>> |
| 8537 | && ... && convertible_to<iterator_t<_Vs>, iterator_t<const _Vs>>) |
| 8538 | : _M_parent(std::__addressof(__i._M_parent)), |
| 8539 | _M_current(std::move(__i._M_current)) |
| 8540 | { } |
| 8541 | |
| 8542 | constexpr auto |
| 8543 | operator*() const |
| 8544 | { |
| 8545 | auto __f = [](auto& __i) -> decltype(auto) { |
| 8546 | return *__i; |
| 8547 | }; |
| 8548 | return __detail::__tuple_transform(__f, _M_current); |
| 8549 | } |
| 8550 | |
| 8551 | constexpr _Iterator& |
| 8552 | operator++() |
| 8553 | { |
| 8554 | _M_next(); |
| 8555 | return *this; |
| 8556 | } |
| 8557 | |
| 8558 | constexpr void |
| 8559 | operator++(int) |
| 8560 | { ++*this; } |
| 8561 | |
| 8562 | constexpr _Iterator |
| 8563 | operator++(int) requires forward_range<__maybe_const_t<_Const, _First>> |
| 8564 | { |
| 8565 | auto __tmp = *this; |
| 8566 | ++*this; |
| 8567 | return __tmp; |
| 8568 | } |
| 8569 | |
| 8570 | constexpr _Iterator& |
| 8571 | operator--() |
| 8572 | requires __detail::__cartesian_product_is_bidirectional<_Const, _First, _Vs...> |
| 8573 | { |
| 8574 | _M_prev(); |
| 8575 | return *this; |
| 8576 | } |
| 8577 | |
| 8578 | constexpr _Iterator |
| 8579 | operator--(int) |
| 8580 | requires __detail::__cartesian_product_is_bidirectional<_Const, _First, _Vs...> |
| 8581 | { |
| 8582 | auto __tmp = *this; |
| 8583 | --*this; |
| 8584 | return __tmp; |
| 8585 | } |
| 8586 | |
| 8587 | constexpr _Iterator& |
| 8588 | operator+=(difference_type __x) |
| 8589 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8590 | { |
| 8591 | _M_advance(__x); |
| 8592 | return *this; |
| 8593 | } |
| 8594 | |
| 8595 | constexpr _Iterator& |
| 8596 | operator-=(difference_type __x) |
| 8597 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8598 | { return *this += -__x; } |
| 8599 | |
| 8600 | constexpr reference |
| 8601 | operator[](difference_type __n) const |
| 8602 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8603 | { return *((*this) + __n); } |
| 8604 | |
| 8605 | friend constexpr bool |
| 8606 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 8607 | requires equality_comparable<iterator_t<__maybe_const_t<_Const, _First>>> |
| 8608 | { return __x._M_current == __y._M_current; } |
| 8609 | |
| 8610 | friend constexpr bool |
| 8611 | operator==(const _Iterator& __x, default_sentinel_t) |
| 8612 | { |
| 8613 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8614 | return ((std::get<_Is>(__x._M_current) |
| 8615 | == ranges::end(std::get<_Is>(__x._M_parent->_M_bases))) |
| 8616 | || ...); |
| 8617 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8618 | } |
| 8619 | |
| 8620 | friend constexpr auto |
| 8621 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 8622 | requires __detail::__all_random_access<_Const, _First, _Vs...> |
| 8623 | { return __x._M_current <=> __y._M_current; } |
| 8624 | |
| 8625 | friend constexpr _Iterator |
| 8626 | operator+(_Iterator __x, difference_type __y) |
| 8627 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8628 | { return __x += __y; } |
| 8629 | |
| 8630 | friend constexpr _Iterator |
| 8631 | operator+(difference_type __x, _Iterator __y) |
| 8632 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8633 | { return __y += __x; } |
| 8634 | |
| 8635 | friend constexpr _Iterator |
| 8636 | operator-(_Iterator __x, difference_type __y) |
| 8637 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8638 | { return __x -= __y; } |
| 8639 | |
| 8640 | friend constexpr difference_type |
| 8641 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 8642 | requires __detail::__cartesian_is_sized_sentinel<_Const, iterator_t, _First, _Vs...> |
| 8643 | { return __x._M_distance_from(__y._M_current); } |
| 8644 | |
| 8645 | friend constexpr difference_type |
| 8646 | operator-(const _Iterator& __i, default_sentinel_t) |
| 8647 | requires __detail::__cartesian_is_sized_sentinel<_Const, sentinel_t, _First, _Vs...> |
| 8648 | { |
| 8649 | tuple __end_tuple = [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8650 | return tuple{ranges::end(std::get<0>(__i._M_parent->_M_bases)), |
| 8651 | ranges::begin(std::get<1 + _Is>(__i._M_parent->_M_bases))...}; |
| 8652 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 8653 | return __i._M_distance_from(__end_tuple); |
| 8654 | } |
| 8655 | |
| 8656 | friend constexpr difference_type |
| 8657 | operator-(default_sentinel_t, const _Iterator& __i) |
| 8658 | requires __detail::__cartesian_is_sized_sentinel<_Const, sentinel_t, _First, _Vs...> |
| 8659 | { return -(__i - default_sentinel); } |
| 8660 | |
| 8661 | friend constexpr auto |
| 8662 | iter_move(const _Iterator& __i) |
| 8663 | { return __detail::__tuple_transform(ranges::iter_move, __i._M_current); } |
| 8664 | |
| 8665 | friend constexpr void |
| 8666 | iter_swap(const _Iterator& __l, const _Iterator& __r) |
| 8667 | requires (indirectly_swappable<iterator_t<__maybe_const_t<_Const, _First>>> |
| 8668 | && ... |
| 8669 | && indirectly_swappable<iterator_t<__maybe_const_t<_Const, _Vs>>>) |
| 8670 | { |
| 8671 | [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8672 | (ranges::iter_swap(std::get<_Is>(__l._M_current), std::get<_Is>(__r._M_current)), ...); |
| 8673 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8674 | } |
| 8675 | |
| 8676 | private: |
| 8677 | template<size_t _Nm = sizeof...(_Vs)> |
| 8678 | constexpr void |
| 8679 | _M_next() |
| 8680 | { |
| 8681 | auto& __it = std::get<_Nm>(_M_current); |
| 8682 | ++__it; |
| 8683 | if constexpr (_Nm > 0) |
| 8684 | if (__it == ranges::end(std::get<_Nm>(_M_parent->_M_bases))) |
| 8685 | { |
| 8686 | __it = ranges::begin(std::get<_Nm>(_M_parent->_M_bases)); |
| 8687 | _M_next<_Nm - 1>(); |
| 8688 | } |
| 8689 | } |
| 8690 | |
| 8691 | template<size_t _Nm = sizeof...(_Vs)> |
| 8692 | constexpr void |
| 8693 | _M_prev() |
| 8694 | { |
| 8695 | auto& __it = std::get<_Nm>(_M_current); |
| 8696 | if constexpr (_Nm > 0) |
| 8697 | if (__it == ranges::begin(std::get<_Nm>(_M_parent->_M_bases))) |
| 8698 | { |
| 8699 | __it = __detail::__cartesian_common_arg_end(std::get<_Nm>(_M_parent->_M_bases)); |
| 8700 | _M_prev<_Nm - 1>(); |
| 8701 | } |
| 8702 | --__it; |
| 8703 | } |
| 8704 | |
| 8705 | template<size_t _Nm = sizeof...(_Vs)> |
| 8706 | constexpr void |
| 8707 | _M_advance(difference_type __x) |
| 8708 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8709 | { |
| 8710 | if (__x == 1) |
| 8711 | _M_next<_Nm>(); |
| 8712 | else if (__x == -1) |
| 8713 | _M_prev<_Nm>(); |
| 8714 | else if (__x != 0) |
| 8715 | { |
| 8716 | // Constant time iterator advancement. |
| 8717 | auto& __r = std::get<_Nm>(_M_parent->_M_bases); |
| 8718 | auto& __it = std::get<_Nm>(_M_current); |
| 8719 | if constexpr (_Nm == 0) |
| 8720 | { |
| 8721 | #ifdef _GLIBCXX_ASSERTIONS |
| 8722 | if constexpr (sized_range<__maybe_const_t<_Const, _First>>) |
| 8723 | { |
| 8724 | auto __size = ranges::ssize(__r); |
| 8725 | auto __begin = ranges::begin(__r); |
| 8726 | auto __offset = __it - __begin; |
| 8727 | __glibcxx_assert(__offset + __x >= 0 && __offset + __x <= __size); |
| 8728 | } |
| 8729 | #endif |
| 8730 | __it += __x; |
| 8731 | } |
| 8732 | else |
| 8733 | { |
| 8734 | auto __size = ranges::ssize(__r); |
| 8735 | auto __begin = ranges::begin(__r); |
| 8736 | auto __offset = __it - __begin; |
| 8737 | __offset += __x; |
| 8738 | __x = __offset / __size; |
| 8739 | __offset %= __size; |
| 8740 | if (__offset < 0) |
| 8741 | { |
| 8742 | __offset = __size + __offset; |
| 8743 | --__x; |
| 8744 | } |
| 8745 | __it = __begin + __offset; |
| 8746 | _M_advance<_Nm - 1>(__x); |
| 8747 | } |
| 8748 | } |
| 8749 | } |
| 8750 | |
| 8751 | template<typename _Tuple> |
| 8752 | constexpr difference_type |
| 8753 | _M_distance_from(const _Tuple& __t) const |
| 8754 | { |
| 8755 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8756 | auto __sum = static_cast<difference_type>(0); |
| 8757 | #ifdef _GLIBCXX_ASSERTIONS |
| 8758 | if constexpr (integral<difference_type>) |
| 8759 | { |
| 8760 | bool __overflow |
| 8761 | = (__builtin_add_overflow(__sum, _M_scaled_distance<_Is>(__t), &__sum) |
| 8762 | || ...); |
| 8763 | __glibcxx_assert(!__overflow); |
| 8764 | } |
| 8765 | else |
| 8766 | #endif |
| 8767 | __sum = (_M_scaled_distance<_Is>(__t) + ...); |
| 8768 | return __sum; |
| 8769 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8770 | } |
| 8771 | |
| 8772 | template<size_t _Nm, typename _Tuple> |
| 8773 | constexpr difference_type |
| 8774 | _M_scaled_distance(const _Tuple& __t) const |
| 8775 | { |
| 8776 | auto __dist = static_cast<difference_type>(std::get<_Nm>(_M_current) |
| 8777 | - std::get<_Nm>(__t)); |
| 8778 | #ifdef _GLIBCXX_ASSERTIONS |
| 8779 | if constexpr (integral<difference_type>) |
| 8780 | { |
| 8781 | bool __overflow = __builtin_mul_overflow(__dist, _M_scaled_size<_Nm+1>(), &__dist); |
| 8782 | __glibcxx_assert(!__overflow); |
| 8783 | } |
| 8784 | else |
| 8785 | #endif |
| 8786 | __dist *= _M_scaled_size<_Nm+1>(); |
| 8787 | return __dist; |
| 8788 | } |
| 8789 | |
| 8790 | template<size_t _Nm> |
| 8791 | constexpr difference_type |
| 8792 | _M_scaled_size() const |
| 8793 | { |
| 8794 | if constexpr (_Nm <= sizeof...(_Vs)) |
| 8795 | { |
| 8796 | auto __size = static_cast<difference_type>(ranges::size |
| 8797 | (std::get<_Nm>(_M_parent->_M_bases))); |
| 8798 | #ifdef _GLIBCXX_ASSERTIONS |
| 8799 | if constexpr (integral<difference_type>) |
| 8800 | { |
| 8801 | bool __overflow = __builtin_mul_overflow(__size, _M_scaled_size<_Nm+1>(), &__size); |
| 8802 | __glibcxx_assert(!__overflow); |
| 8803 | } |
| 8804 | else |
| 8805 | #endif |
| 8806 | __size *= _M_scaled_size<_Nm+1>(); |
| 8807 | return __size; |
| 8808 | } |
| 8809 | else |
| 8810 | return static_cast<difference_type>(1); |
| 8811 | } |
| 8812 | }; |
| 8813 | |
| 8814 | namespace views |
| 8815 | { |
| 8816 | namespace __detail |
| 8817 | { |
| 8818 | template<typename... _Ts> |
| 8819 | concept __can_cartesian_product_view |
| 8820 | = requires { cartesian_product_view<all_t<_Ts>...>(std::declval<_Ts>()...); }; |
| 8821 | } |
| 8822 | |
| 8823 | struct _CartesianProduct |
| 8824 | { |
| 8825 | template<typename... _Ts> |
| 8826 | requires (sizeof...(_Ts) == 0 || __detail::__can_cartesian_product_view<_Ts...>) |
| 8827 | constexpr auto |
| 8828 | operator() [[nodiscard]] (_Ts&&... __ts) const |
| 8829 | { |
| 8830 | if constexpr (sizeof...(_Ts) == 0) |
| 8831 | return views::single(tuple{}); |
| 8832 | else |
| 8833 | return cartesian_product_view<all_t<_Ts>...>(std::forward<_Ts>(__ts)...); |
| 8834 | } |
| 8835 | }; |
| 8836 | |
| 8837 | inline constexpr _CartesianProduct cartesian_product; |
| 8838 | } |
| 8839 | #endif // __cpp_lib_ranges_cartesian_product |
| 8840 | |
| 8841 | #ifdef __cpp_lib_ranges_as_rvalue // C++ >= 23 |
| 8842 | template<input_range _Vp> |
| 8843 | requires view<_Vp> |
| 8844 | class as_rvalue_view : public view_interface<as_rvalue_view<_Vp>> |
| 8845 | { |
| 8846 | _Vp _M_base = _Vp(); |
| 8847 | |
| 8848 | public: |
| 8849 | as_rvalue_view() requires default_initializable<_Vp> = default; |
| 8850 | |
| 8851 | constexpr explicit |
| 8852 | as_rvalue_view(_Vp __base) |
| 8853 | : _M_base(std::move(__base)) |
| 8854 | { } |
| 8855 | |
| 8856 | constexpr _Vp |
| 8857 | base() const& requires copy_constructible<_Vp> |
| 8858 | { return _M_base; } |
| 8859 | |
| 8860 | constexpr _Vp |
| 8861 | base() && |
| 8862 | { return std::move(_M_base); } |
| 8863 | |
| 8864 | constexpr auto |
| 8865 | begin() requires (!__detail::__simple_view<_Vp>) |
| 8866 | { return move_iterator(ranges::begin(_M_base)); } |
| 8867 | |
| 8868 | constexpr auto |
| 8869 | begin() const requires range<const _Vp> |
| 8870 | { return move_iterator(ranges::begin(_M_base)); } |
| 8871 | |
| 8872 | constexpr auto |
| 8873 | end() requires (!__detail::__simple_view<_Vp>) |
| 8874 | { |
| 8875 | if constexpr (common_range<_Vp>) |
| 8876 | return move_iterator(ranges::end(_M_base)); |
| 8877 | else |
| 8878 | return move_sentinel(ranges::end(_M_base)); |
| 8879 | } |
| 8880 | |
| 8881 | constexpr auto |
| 8882 | end() const requires range<const _Vp> |
| 8883 | { |
| 8884 | if constexpr (common_range<const _Vp>) |
| 8885 | return move_iterator(ranges::end(_M_base)); |
| 8886 | else |
| 8887 | return move_sentinel(ranges::end(_M_base)); |
| 8888 | } |
| 8889 | |
| 8890 | constexpr auto |
| 8891 | size() requires sized_range<_Vp> |
| 8892 | { return ranges::size(_M_base); } |
| 8893 | |
| 8894 | constexpr auto |
| 8895 | size() const requires sized_range<const _Vp> |
| 8896 | { return ranges::size(_M_base); } |
| 8897 | }; |
| 8898 | |
| 8899 | template<typename _Range> |
| 8900 | as_rvalue_view(_Range&&) -> as_rvalue_view<views::all_t<_Range>>; |
| 8901 | |
| 8902 | template<typename _Tp> |
| 8903 | inline constexpr bool enable_borrowed_range<as_rvalue_view<_Tp>> |
| 8904 | = enable_borrowed_range<_Tp>; |
| 8905 | |
| 8906 | namespace views |
| 8907 | { |
| 8908 | namespace __detail |
| 8909 | { |
| 8910 | template<typename _Tp> |
| 8911 | concept __can_as_rvalue_view = requires { as_rvalue_view(std::declval<_Tp>()); }; |
| 8912 | } |
| 8913 | |
| 8914 | struct _AsRvalue : __adaptor::_RangeAdaptorClosure<_AsRvalue> |
| 8915 | { |
| 8916 | template<viewable_range _Range> |
| 8917 | requires __detail::__can_as_rvalue_view<_Range> |
| 8918 | constexpr auto |
| 8919 | operator() [[nodiscard]] (_Range&& __r) const |
| 8920 | { |
| 8921 | if constexpr (same_as<range_rvalue_reference_t<_Range>, |
| 8922 | range_reference_t<_Range>>) |
| 8923 | return views::all(std::forward<_Range>(__r)); |
| 8924 | else |
| 8925 | return as_rvalue_view(std::forward<_Range>(__r)); |
| 8926 | } |
| 8927 | }; |
| 8928 | |
| 8929 | inline constexpr _AsRvalue as_rvalue; |
| 8930 | } |
| 8931 | #endif // __cpp_lib_as_rvalue |
| 8932 | |
| 8933 | #ifdef __cpp_lib_ranges_enumerate // C++ >= 23 |
| 8934 | namespace __detail |
| 8935 | { |
| 8936 | template<typename _Range> |
| 8937 | concept __range_with_movable_reference = input_range<_Range> |
| 8938 | && move_constructible<range_reference_t<_Range>> |
| 8939 | && move_constructible<range_rvalue_reference_t<_Range>>; |
| 8940 | } |
| 8941 | |
| 8942 | template<view _Vp> |
| 8943 | requires __detail::__range_with_movable_reference<_Vp> |
| 8944 | class enumerate_view : public view_interface<enumerate_view<_Vp>> |
| 8945 | { |
| 8946 | _Vp _M_base = _Vp(); |
| 8947 | |
| 8948 | template<bool _Const> class _Iterator; |
| 8949 | template<bool _Const> class _Sentinel; |
| 8950 | |
| 8951 | public: |
| 8952 | enumerate_view() requires default_initializable<_Vp> = default; |
| 8953 | |
| 8954 | constexpr explicit |
| 8955 | enumerate_view(_Vp __base) |
| 8956 | : _M_base(std::move(__base)) |
| 8957 | { } |
| 8958 | |
| 8959 | constexpr auto |
| 8960 | begin() requires (!__detail::__simple_view<_Vp>) |
| 8961 | { return _Iterator<false>(ranges::begin(_M_base), 0); } |
| 8962 | |
| 8963 | constexpr auto |
| 8964 | begin() const requires __detail::__range_with_movable_reference<const _Vp> |
| 8965 | { return _Iterator<true>(ranges::begin(_M_base), 0); } |
| 8966 | |
| 8967 | constexpr auto |
| 8968 | end() requires (!__detail::__simple_view<_Vp>) |
| 8969 | { |
| 8970 | if constexpr (common_range<_Vp> && sized_range<_Vp>) |
| 8971 | return _Iterator<false>(ranges::end(_M_base), ranges::distance(_M_base)); |
| 8972 | else |
| 8973 | return _Sentinel<false>(ranges::end(_M_base)); |
| 8974 | } |
| 8975 | |
| 8976 | constexpr auto |
| 8977 | end() const requires __detail::__range_with_movable_reference<const _Vp> |
| 8978 | { |
| 8979 | if constexpr (common_range<const _Vp> && sized_range<const _Vp>) |
| 8980 | return _Iterator<true>(ranges::end(_M_base), ranges::distance(_M_base)); |
| 8981 | else |
| 8982 | return _Sentinel<true>(ranges::end(_M_base)); |
| 8983 | } |
| 8984 | |
| 8985 | constexpr auto |
| 8986 | size() requires sized_range<_Vp> |
| 8987 | { return ranges::size(_M_base); } |
| 8988 | |
| 8989 | constexpr auto |
| 8990 | size() const requires sized_range<const _Vp> |
| 8991 | { return ranges::size(_M_base); } |
| 8992 | |
| 8993 | constexpr _Vp |
| 8994 | base() const & requires copy_constructible<_Vp> |
| 8995 | { return _M_base; } |
| 8996 | |
| 8997 | constexpr _Vp |
| 8998 | base() && |
| 8999 | { return std::move(_M_base); } |
| 9000 | }; |
| 9001 | |
| 9002 | template<typename _Range> |
| 9003 | enumerate_view(_Range&&) -> enumerate_view<views::all_t<_Range>>; |
| 9004 | |
| 9005 | template<typename _Tp> |
| 9006 | inline constexpr bool enable_borrowed_range<enumerate_view<_Tp>> |
| 9007 | = enable_borrowed_range<_Tp>; |
| 9008 | |
| 9009 | template<view _Vp> |
| 9010 | requires __detail::__range_with_movable_reference<_Vp> |
| 9011 | template<bool _Const> |
| 9012 | class enumerate_view<_Vp>::_Iterator |
| 9013 | { |
| 9014 | using _Base = __maybe_const_t<_Const, _Vp>; |
| 9015 | |
| 9016 | static auto |
| 9017 | _S_iter_concept() |
| 9018 | { |
| 9019 | if constexpr (random_access_range<_Base>) |
| 9020 | return random_access_iterator_tag{}; |
| 9021 | else if constexpr (bidirectional_range<_Base>) |
| 9022 | return bidirectional_iterator_tag{}; |
| 9023 | else if constexpr (forward_range<_Base>) |
| 9024 | return forward_iterator_tag{}; |
| 9025 | else |
| 9026 | return input_iterator_tag{}; |
| 9027 | } |
| 9028 | |
| 9029 | friend enumerate_view; |
| 9030 | |
| 9031 | public: |
| 9032 | using iterator_category = input_iterator_tag; |
| 9033 | using iterator_concept = decltype(_S_iter_concept()); |
| 9034 | using difference_type = range_difference_t<_Base>; |
| 9035 | using value_type = tuple<difference_type, range_value_t<_Base>>; |
| 9036 | |
| 9037 | private: |
| 9038 | using __reference_type = tuple<difference_type, range_reference_t<_Base>>; |
| 9039 | |
| 9040 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 9041 | difference_type _M_pos = 0; |
| 9042 | |
| 9043 | constexpr explicit |
| 9044 | _Iterator(iterator_t<_Base> __current, difference_type __pos) |
| 9045 | : _M_current(std::move(__current)), _M_pos(__pos) |
| 9046 | { } |
| 9047 | |
| 9048 | public: |
| 9049 | _Iterator() requires default_initializable<iterator_t<_Base>> = default; |
| 9050 | |
| 9051 | constexpr |
| 9052 | _Iterator(_Iterator<!_Const> __i) |
| 9053 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 9054 | : _M_current(std::move(__i._M_current)), _M_pos(__i._M_pos) |
| 9055 | { } |
| 9056 | |
| 9057 | constexpr const iterator_t<_Base> & |
| 9058 | base() const & noexcept |
| 9059 | { return _M_current; } |
| 9060 | |
| 9061 | constexpr iterator_t<_Base> |
| 9062 | base() && |
| 9063 | { return std::move(_M_current); } |
| 9064 | |
| 9065 | constexpr difference_type |
| 9066 | index() const noexcept |
| 9067 | { return _M_pos; } |
| 9068 | |
| 9069 | constexpr auto |
| 9070 | operator*() const |
| 9071 | { return __reference_type(_M_pos, *_M_current); } |
| 9072 | |
| 9073 | constexpr _Iterator& |
| 9074 | operator++() |
| 9075 | { |
| 9076 | ++_M_current; |
| 9077 | ++_M_pos; |
| 9078 | return *this; |
| 9079 | } |
| 9080 | |
| 9081 | constexpr void |
| 9082 | operator++(int) |
| 9083 | { ++*this; } |
| 9084 | |
| 9085 | constexpr _Iterator |
| 9086 | operator++(int) requires forward_range<_Base> |
| 9087 | { |
| 9088 | auto __tmp = *this; |
| 9089 | ++*this; |
| 9090 | return __tmp; |
| 9091 | } |
| 9092 | |
| 9093 | constexpr _Iterator& |
| 9094 | operator--() requires bidirectional_range<_Base> |
| 9095 | { |
| 9096 | --_M_current; |
| 9097 | --_M_pos; |
| 9098 | return *this; |
| 9099 | } |
| 9100 | |
| 9101 | constexpr _Iterator |
| 9102 | operator--(int) requires bidirectional_range<_Base> |
| 9103 | { |
| 9104 | auto __tmp = *this; |
| 9105 | --*this; |
| 9106 | return __tmp; |
| 9107 | } |
| 9108 | |
| 9109 | constexpr _Iterator& |
| 9110 | operator+=(difference_type __n) requires random_access_range<_Base> |
| 9111 | { |
| 9112 | _M_current += __n; |
| 9113 | _M_pos += __n; |
| 9114 | return *this; |
| 9115 | } |
| 9116 | |
| 9117 | constexpr _Iterator& |
| 9118 | operator-=(difference_type __n) requires random_access_range<_Base> |
| 9119 | { |
| 9120 | _M_current -= __n; |
| 9121 | _M_pos -= __n; |
| 9122 | return *this; |
| 9123 | } |
| 9124 | |
| 9125 | constexpr auto |
| 9126 | operator[](difference_type __n) const requires random_access_range<_Base> |
| 9127 | { return __reference_type(_M_pos + __n, _M_current[__n]); } |
| 9128 | |
| 9129 | friend constexpr bool |
| 9130 | operator==(const _Iterator& __x, const _Iterator& __y) noexcept |
| 9131 | { return __x._M_pos == __y._M_pos; } |
| 9132 | |
| 9133 | friend constexpr strong_ordering |
| 9134 | operator<=>(const _Iterator& __x, const _Iterator& __y) noexcept |
| 9135 | { return __x._M_pos <=> __y._M_pos; } |
| 9136 | |
| 9137 | friend constexpr _Iterator |
| 9138 | operator+(const _Iterator& __x, difference_type __y) |
| 9139 | requires random_access_range<_Base> |
| 9140 | { return (auto(__x) += __y); } |
| 9141 | |
| 9142 | friend constexpr _Iterator |
| 9143 | operator+(difference_type __x, const _Iterator& __y) |
| 9144 | requires random_access_range<_Base> |
| 9145 | { return auto(__y) += __x; } |
| 9146 | |
| 9147 | friend constexpr _Iterator |
| 9148 | operator-(const _Iterator& __x, difference_type __y) |
| 9149 | requires random_access_range<_Base> |
| 9150 | { return auto(__x) -= __y; } |
| 9151 | |
| 9152 | friend constexpr difference_type |
| 9153 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 9154 | { return __x._M_pos - __y._M_pos; } |
| 9155 | |
| 9156 | friend constexpr auto |
| 9157 | iter_move(const _Iterator& __i) |
| 9158 | noexcept(noexcept(ranges::iter_move(__i._M_current)) |
| 9159 | && is_nothrow_move_constructible_v<range_rvalue_reference_t<_Base>>) |
| 9160 | { |
| 9161 | return tuple<difference_type, range_rvalue_reference_t<_Base>> |
| 9162 | (__i._M_pos, ranges::iter_move(__i._M_current)); |
| 9163 | } |
| 9164 | }; |
| 9165 | |
| 9166 | template<view _Vp> |
| 9167 | requires __detail::__range_with_movable_reference<_Vp> |
| 9168 | template<bool _Const> |
| 9169 | class enumerate_view<_Vp>::_Sentinel |
| 9170 | { |
| 9171 | using _Base = __maybe_const_t<_Const, _Vp>; |
| 9172 | |
| 9173 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 9174 | |
| 9175 | constexpr explicit |
| 9176 | _Sentinel(sentinel_t<_Base> __end) |
| 9177 | : _M_end(std::move(__end)) |
| 9178 | { } |
| 9179 | |
| 9180 | friend enumerate_view; |
| 9181 | |
| 9182 | public: |
| 9183 | _Sentinel() = default; |
| 9184 | |
| 9185 | constexpr |
| 9186 | _Sentinel(_Sentinel<!_Const> __other) |
| 9187 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 9188 | : _M_end(std::move(__other._M_end)) |
| 9189 | { } |
| 9190 | |
| 9191 | constexpr sentinel_t<_Base> |
| 9192 | base() const |
| 9193 | { return _M_end; } |
| 9194 | |
| 9195 | template<bool _OtherConst> |
| 9196 | requires sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const_t<_OtherConst, _Vp>>> |
| 9197 | friend constexpr bool |
| 9198 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 9199 | { return __x._M_current == __y._M_end; } |
| 9200 | |
| 9201 | template<bool _OtherConst> |
| 9202 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const_t<_OtherConst, _Vp>>> |
| 9203 | friend constexpr range_difference_t<__maybe_const_t<_OtherConst, _Vp>> |
| 9204 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 9205 | { return __x._M_current - __y._M_end; } |
| 9206 | |
| 9207 | template<bool _OtherConst> |
| 9208 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const_t<_OtherConst, _Vp>>> |
| 9209 | friend constexpr range_difference_t<__maybe_const_t<_OtherConst, _Vp>> |
| 9210 | operator-(const _Sentinel& __x, const _Iterator<_OtherConst>& __y) |
| 9211 | { return __x._M_end - __y._M_current; } |
| 9212 | }; |
| 9213 | |
| 9214 | namespace views |
| 9215 | { |
| 9216 | namespace __detail |
| 9217 | { |
| 9218 | template<typename _Tp> |
| 9219 | concept __can_enumerate_view |
| 9220 | = requires { enumerate_view<all_t<_Tp>>(std::declval<_Tp>()); }; |
| 9221 | } |
| 9222 | |
| 9223 | struct _Enumerate : __adaptor::_RangeAdaptorClosure<_Enumerate> |
| 9224 | { |
| 9225 | template<viewable_range _Range> |
| 9226 | requires __detail::__can_enumerate_view<_Range> |
| 9227 | constexpr auto |
| 9228 | operator() [[nodiscard]] (_Range&& __r) const |
| 9229 | { return enumerate_view<all_t<_Range>>(std::forward<_Range>(__r)); } |
| 9230 | }; |
| 9231 | |
| 9232 | inline constexpr _Enumerate enumerate; |
| 9233 | } |
| 9234 | #endif // __cpp_lib_ranges_enumerate |
| 9235 | |
| 9236 | #ifdef __cpp_lib_ranges_as_const // C++ >= 23 |
| 9237 | template<view _Vp> |
| 9238 | requires input_range<_Vp> |
| 9239 | class as_const_view : public view_interface<as_const_view<_Vp>> |
| 9240 | { |
| 9241 | _Vp _M_base = _Vp(); |
| 9242 | |
| 9243 | public: |
| 9244 | as_const_view() requires default_initializable<_Vp> = default; |
| 9245 | |
| 9246 | constexpr explicit |
| 9247 | as_const_view(_Vp __base) |
| 9248 | noexcept(is_nothrow_move_constructible_v<_Vp>) |
| 9249 | : _M_base(std::move(__base)) |
| 9250 | { } |
| 9251 | |
| 9252 | constexpr _Vp |
| 9253 | base() const & |
| 9254 | noexcept(is_nothrow_copy_constructible_v<_Vp>) |
| 9255 | requires copy_constructible<_Vp> |
| 9256 | { return _M_base; } |
| 9257 | |
| 9258 | constexpr _Vp |
| 9259 | base() && |
| 9260 | noexcept(is_nothrow_move_constructible_v<_Vp>) |
| 9261 | { return std::move(_M_base); } |
| 9262 | |
| 9263 | constexpr auto |
| 9264 | begin() requires (!__detail::__simple_view<_Vp>) |
| 9265 | { return ranges::cbegin(_M_base); } |
| 9266 | |
| 9267 | constexpr auto |
| 9268 | begin() const requires range<const _Vp> |
| 9269 | { return ranges::cbegin(_M_base); } |
| 9270 | |
| 9271 | constexpr auto |
| 9272 | end() requires (!__detail::__simple_view<_Vp>) |
| 9273 | { return ranges::cend(_M_base); } |
| 9274 | |
| 9275 | constexpr auto |
| 9276 | end() const requires range<const _Vp> |
| 9277 | { return ranges::cend(_M_base); } |
| 9278 | |
| 9279 | constexpr auto |
| 9280 | size() requires sized_range<_Vp> |
| 9281 | { return ranges::size(_M_base); } |
| 9282 | |
| 9283 | constexpr auto |
| 9284 | size() const requires sized_range<const _Vp> |
| 9285 | { return ranges::size(_M_base); } |
| 9286 | }; |
| 9287 | |
| 9288 | template<typename _Range> |
| 9289 | as_const_view(_Range&&) -> as_const_view<views::all_t<_Range>>; |
| 9290 | |
| 9291 | template<typename _Tp> |
| 9292 | inline constexpr bool enable_borrowed_range<as_const_view<_Tp>> |
| 9293 | = enable_borrowed_range<_Tp>; |
| 9294 | |
| 9295 | namespace views |
| 9296 | { |
| 9297 | namespace __detail |
| 9298 | { |
| 9299 | template<typename _Tp> |
| 9300 | inline constexpr bool __is_ref_view = false; |
| 9301 | |
| 9302 | template<typename _Range> |
| 9303 | inline constexpr bool __is_ref_view<ref_view<_Range>> = true; |
| 9304 | |
| 9305 | template<typename _Range> |
| 9306 | concept __can_as_const_view = requires { as_const_view(std::declval<_Range>()); }; |
| 9307 | } |
| 9308 | |
| 9309 | struct _AsConst : __adaptor::_RangeAdaptorClosure<_AsConst> |
| 9310 | { |
| 9311 | template<viewable_range _Range> |
| 9312 | constexpr auto |
| 9313 | operator()(_Range&& __r) const |
| 9314 | noexcept(noexcept(as_const_view(std::declval<_Range>()))) |
| 9315 | requires __detail::__can_as_const_view<_Range> |
| 9316 | { |
| 9317 | using _Tp = remove_cvref_t<_Range>; |
| 9318 | using element_type = remove_reference_t<range_reference_t<_Range>>; |
| 9319 | if constexpr (constant_range<views::all_t<_Range>>) |
| 9320 | return views::all(std::forward<_Range>(__r)); |
| 9321 | else if constexpr (__detail::__is_empty_view<_Tp>) |
| 9322 | return views::empty<const element_type>; |
| 9323 | else if constexpr (std::__detail::__is_span<_Tp>) |
| 9324 | return span<const element_type, _Tp::extent>(std::forward<_Range>(__r)); |
| 9325 | else if constexpr (__detail::__is_ref_view<_Tp> |
| 9326 | && constant_range<const element_type>) |
| 9327 | return ref_view(static_cast<const element_type&> |
| 9328 | (std::forward<_Range>(__r).base())); |
| 9329 | else if constexpr (is_lvalue_reference_v<_Range> |
| 9330 | && constant_range<const _Tp> |
| 9331 | && !view<_Tp>) |
| 9332 | return ref_view(static_cast<const _Tp&>(__r)); |
| 9333 | else |
| 9334 | return as_const_view(std::forward<_Range>(__r)); |
| 9335 | } |
| 9336 | }; |
| 9337 | |
| 9338 | inline constexpr _AsConst as_const; |
| 9339 | } |
| 9340 | #endif // __cpp_lib_as_const |
| 9341 | } // namespace ranges |
| 9342 | |
| 9343 | namespace views = ranges::views; |
| 9344 | |
| 9345 | #if __cpp_lib_ranges_to_container // C++ >= 23 |
| 9346 | namespace ranges |
| 9347 | { |
| 9348 | /// @cond undocumented |
| 9349 | namespace __detail |
| 9350 | { |
| 9351 | template<typename _Container> |
| 9352 | constexpr bool __reservable_container |
| 9353 | = sized_range<_Container> |
| 9354 | && requires(_Container& __c, range_size_t<_Container> __n) { |
| 9355 | __c.reserve(__n); |
| 9356 | { __c.capacity() } -> same_as<decltype(__n)>; |
| 9357 | { __c.max_size() } -> same_as<decltype(__n)>; |
| 9358 | }; |
| 9359 | |
| 9360 | template<typename _Cont, typename _Range> |
| 9361 | constexpr bool __toable = requires { |
| 9362 | requires (!input_range<_Cont> |
| 9363 | || convertible_to<range_reference_t<_Range>, |
| 9364 | range_value_t<_Cont>>); |
| 9365 | }; |
| 9366 | } // namespace __detail |
| 9367 | /// @endcond |
| 9368 | |
| 9369 | /// Convert a range to a container. |
| 9370 | /** |
| 9371 | * @tparam _Cont A container type. |
| 9372 | * @param __r A range that models the `input_range` concept. |
| 9373 | * @param __args... Arguments to pass to the container constructor. |
| 9374 | * @since C++23 |
| 9375 | * |
| 9376 | * This function converts a range to the `_Cont` type. |
| 9377 | * |
| 9378 | * For example, `std::ranges::to<std::vector<int>>(some_view)` |
| 9379 | * will convert the view to `std::vector<int>`. |
| 9380 | * |
| 9381 | * Additional constructor arguments for the container can be supplied after |
| 9382 | * the input range argument, e.g. |
| 9383 | * `std::ranges::to<std::vector<int, Alloc<int>>>(a_range, an_allocator)`. |
| 9384 | */ |
| 9385 | template<typename _Cont, input_range _Rg, typename... _Args> |
| 9386 | requires (!view<_Cont>) |
| 9387 | constexpr _Cont |
| 9388 | to [[nodiscard]] (_Rg&& __r, _Args&&... __args) |
| 9389 | { |
| 9390 | static_assert(!is_const_v<_Cont> && !is_volatile_v<_Cont>); |
| 9391 | static_assert(is_class_v<_Cont>); |
| 9392 | |
| 9393 | if constexpr (__detail::__toable<_Cont, _Rg>) |
| 9394 | { |
| 9395 | if constexpr (constructible_from<_Cont, _Rg, _Args...>) |
| 9396 | return _Cont(std::forward<_Rg>(__r), |
| 9397 | std::forward<_Args>(__args)...); |
| 9398 | else if constexpr (constructible_from<_Cont, from_range_t, _Rg, _Args...>) |
| 9399 | return _Cont(from_range, std::forward<_Rg>(__r), |
| 9400 | std::forward<_Args>(__args)...); |
| 9401 | else if constexpr (requires { requires common_range<_Rg>; |
| 9402 | typename __iter_category_t<iterator_t<_Rg>>; |
| 9403 | requires derived_from<__iter_category_t<iterator_t<_Rg>>, |
| 9404 | input_iterator_tag>; |
| 9405 | requires constructible_from<_Cont, iterator_t<_Rg>, |
| 9406 | sentinel_t<_Rg>, _Args...>; |
| 9407 | }) |
| 9408 | return _Cont(ranges::begin(__r), ranges::end(__r), |
| 9409 | std::forward<_Args>(__args)...); |
| 9410 | else |
| 9411 | { |
| 9412 | static_assert(constructible_from<_Cont, _Args...>); |
| 9413 | _Cont __c(std::forward<_Args>(__args)...); |
| 9414 | if constexpr (sized_range<_Rg> |
| 9415 | && __detail::__reservable_container<_Cont>) |
| 9416 | __c.reserve(static_cast<range_size_t<_Cont>>(ranges::size(__r))); |
| 9417 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 9418 | // 4016. container-insertable checks do not match what |
| 9419 | // container-inserter does |
| 9420 | auto __it = ranges::begin(__r); |
| 9421 | const auto __sent = ranges::end(__r); |
| 9422 | while (__it != __sent) |
| 9423 | { |
| 9424 | if constexpr (requires { __c.emplace_back(*__it); }) |
| 9425 | __c.emplace_back(*__it); |
| 9426 | else if constexpr (requires { __c.push_back(*__it); }) |
| 9427 | __c.push_back(*__it); |
| 9428 | else if constexpr (requires { __c.emplace(__c.end(), *__it); }) |
| 9429 | __c.emplace(__c.end(), *__it); |
| 9430 | else |
| 9431 | __c.insert(__c.end(), *__it); |
| 9432 | ++__it; |
| 9433 | } |
| 9434 | return __c; |
| 9435 | } |
| 9436 | } |
| 9437 | else |
| 9438 | { |
| 9439 | static_assert(input_range<range_reference_t<_Rg>>); |
| 9440 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 9441 | // 3984. ranges::to's recursion branch may be ill-formed |
| 9442 | return ranges::to<_Cont>(ref_view(__r) | views::transform( |
| 9443 | []<typename _Elt>(_Elt&& __elem) { |
| 9444 | using _ValT = range_value_t<_Cont>; |
| 9445 | return ranges::to<_ValT>(std::forward<_Elt>(__elem)); |
| 9446 | }), std::forward<_Args>(__args)...); |
| 9447 | } |
| 9448 | } |
| 9449 | |
| 9450 | /// @cond undocumented |
| 9451 | namespace __detail |
| 9452 | { |
| 9453 | template<typename _Rg> |
| 9454 | struct _InputIter |
| 9455 | { |
| 9456 | using iterator_category = input_iterator_tag; |
| 9457 | using value_type = range_value_t<_Rg>; |
| 9458 | using difference_type = ptrdiff_t; |
| 9459 | using pointer = add_pointer_t<range_reference_t<_Rg>>; |
| 9460 | using reference = range_reference_t<_Rg>; |
| 9461 | reference operator*() const; |
| 9462 | pointer operator->() const; |
| 9463 | _InputIter& operator++(); |
| 9464 | _InputIter operator++(int); |
| 9465 | bool operator==(const _InputIter&) const; |
| 9466 | }; |
| 9467 | |
| 9468 | template<template<typename...> typename _Cont, input_range _Rg, |
| 9469 | typename... _Args> |
| 9470 | using _DeduceExpr1 |
| 9471 | = decltype(_Cont(std::declval<_Rg>(), std::declval<_Args>()...)); |
| 9472 | |
| 9473 | template<template<typename...> typename _Cont, input_range _Rg, |
| 9474 | typename... _Args> |
| 9475 | using _DeduceExpr2 |
| 9476 | = decltype(_Cont(from_range, std::declval<_Rg>(), |
| 9477 | std::declval<_Args>()...)); |
| 9478 | |
| 9479 | template<template<typename...> typename _Cont, input_range _Rg, |
| 9480 | typename... _Args> |
| 9481 | using _DeduceExpr3 |
| 9482 | = decltype(_Cont(std::declval<_InputIter<_Rg>>(), |
| 9483 | std::declval<_InputIter<_Rg>>(), |
| 9484 | std::declval<_Args>()...)); |
| 9485 | |
| 9486 | } // namespace __detail |
| 9487 | /// @endcond |
| 9488 | |
| 9489 | template<template<typename...> typename _Cont, input_range _Rg, |
| 9490 | typename... _Args> |
| 9491 | constexpr auto |
| 9492 | to [[nodiscard]] (_Rg&& __r, _Args&&... __args) |
| 9493 | { |
| 9494 | using __detail::_DeduceExpr1; |
| 9495 | using __detail::_DeduceExpr2; |
| 9496 | using __detail::_DeduceExpr3; |
| 9497 | if constexpr (requires { typename _DeduceExpr1<_Cont, _Rg, _Args...>; }) |
| 9498 | return ranges::to<_DeduceExpr1<_Cont, _Rg, _Args...>>( |
| 9499 | std::forward<_Rg>(__r), std::forward<_Args>(__args)...); |
| 9500 | else if constexpr (requires { typename _DeduceExpr2<_Cont, _Rg, _Args...>; }) |
| 9501 | return ranges::to<_DeduceExpr2<_Cont, _Rg, _Args...>>( |
| 9502 | std::forward<_Rg>(__r), std::forward<_Args>(__args)...); |
| 9503 | else if constexpr (requires { typename _DeduceExpr3<_Cont, _Rg, _Args...>; }) |
| 9504 | return ranges::to<_DeduceExpr3<_Cont, _Rg, _Args...>>( |
| 9505 | std::forward<_Rg>(__r), std::forward<_Args>(__args)...); |
| 9506 | else |
| 9507 | static_assert(false); // Cannot deduce container specialization. |
| 9508 | } |
| 9509 | |
| 9510 | /// @cond undocumented |
| 9511 | namespace __detail |
| 9512 | { |
| 9513 | template<typename _Cont> |
| 9514 | struct _To |
| 9515 | { |
| 9516 | template<typename _Range, typename... _Args> |
| 9517 | requires requires { ranges::to<_Cont>(std::declval<_Range>(), |
| 9518 | std::declval<_Args>()...); } |
| 9519 | constexpr auto |
| 9520 | operator()(_Range&& __r, _Args&&... __args) const |
| 9521 | { |
| 9522 | return ranges::to<_Cont>(std::forward<_Range>(__r), |
| 9523 | std::forward<_Args>(__args)...); |
| 9524 | } |
| 9525 | }; |
| 9526 | } // namespace __detail |
| 9527 | /// @endcond |
| 9528 | |
| 9529 | /// ranges::to adaptor for converting a range to a container type |
| 9530 | /** |
| 9531 | * @tparam _Cont A container type. |
| 9532 | * @param __args... Arguments to pass to the container constructor. |
| 9533 | * @since C++23 |
| 9534 | * |
| 9535 | * This range adaptor returns a range adaptor closure object that converts |
| 9536 | * a range to the `_Cont` type. |
| 9537 | * |
| 9538 | * For example, `some_view | std::ranges::to<std::vector<int>>()` |
| 9539 | * will convert the view to `std::vector<int>`. |
| 9540 | * |
| 9541 | * Additional constructor arguments for the container can be supplied, e.g. |
| 9542 | * `r | std::ranges::to<std::vector<int, Alloc<int>>>(an_allocator)`. |
| 9543 | */ |
| 9544 | template<typename _Cont, typename... _Args> |
| 9545 | requires (!view<_Cont>) |
| 9546 | constexpr auto |
| 9547 | to [[nodiscard]] (_Args&&... __args) |
| 9548 | { |
| 9549 | using __detail::_To; |
| 9550 | using views::__adaptor::_Partial; |
| 9551 | return _Partial<_To<_Cont>, decay_t<_Args>...>{0, std::forward<_Args>(__args)...}; |
| 9552 | } |
| 9553 | |
| 9554 | /// @cond undocumented |
| 9555 | namespace __detail |
| 9556 | { |
| 9557 | template<template<typename...> typename _Cont> |
| 9558 | struct _To2 |
| 9559 | { |
| 9560 | template<typename _Range, typename... _Args> |
| 9561 | requires requires { ranges::to<_Cont>(std::declval<_Range>(), |
| 9562 | std::declval<_Args>()...); } |
| 9563 | constexpr auto |
| 9564 | operator()(_Range&& __r, _Args&&... __args) const |
| 9565 | { |
| 9566 | return ranges::to<_Cont>(std::forward<_Range>(__r), |
| 9567 | std::forward<_Args>(__args)...); |
| 9568 | } |
| 9569 | }; |
| 9570 | } // namespace __detail |
| 9571 | /// @endcond |
| 9572 | |
| 9573 | /// ranges::to adaptor for converting a range to a deduced container type. |
| 9574 | /** |
| 9575 | * @tparam _Cont A container template. |
| 9576 | * @param __args... Arguments to pass to the container constructor. |
| 9577 | * @since C++23 |
| 9578 | * |
| 9579 | * This range adaptor returns a range adaptor closure object that converts |
| 9580 | * a range to a specialization of the `_Cont` class template. The specific |
| 9581 | * specialization of `_Cont` to be used is deduced automatically. |
| 9582 | * |
| 9583 | * For example, `some_view | std::ranges::to<std::vector>(Alloc<int>{})` |
| 9584 | * will convert the view to `std::vector<T, Alloc<T>>`, where `T` is the |
| 9585 | * view's value type, i.e. `std::ranges::range_value_t<decltype(some_view)>`. |
| 9586 | * |
| 9587 | * Additional constructor arguments for the container can be supplied, e.g. |
| 9588 | * `r | std::ranges::to<std::vector>(an_allocator)`. |
| 9589 | */ |
| 9590 | template<template<typename...> typename _Cont, typename... _Args> |
| 9591 | constexpr auto |
| 9592 | to [[nodiscard]] (_Args&&... __args) |
| 9593 | { |
| 9594 | using __detail::_To2; |
| 9595 | using views::__adaptor::_Partial; |
| 9596 | return _Partial<_To2<_Cont>, decay_t<_Args>...>{0, std::forward<_Args>(__args)...}; |
| 9597 | } |
| 9598 | |
| 9599 | } // namespace ranges |
| 9600 | #endif // __cpp_lib_ranges_to_container |
| 9601 | |
| 9602 | _GLIBCXX_END_NAMESPACE_VERSION |
| 9603 | } // namespace std |
| 9604 | #endif // library concepts |
| 9605 | #endif // C++2a |
| 9606 | #endif /* _GLIBCXX_RANGES */ |
| 9607 |
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