| 1 | // hashtable.h header -*- C++ -*- |
|---|---|
| 2 | |
| 3 | // Copyright (C) 2007-2024 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 bits/hashtable.h |
| 26 | * This is an internal header file, included by other library headers. |
| 27 | * Do not attempt to use it directly. @headername{unordered_map, unordered_set} |
| 28 | */ |
| 29 | |
| 30 | #ifndef _HASHTABLE_H |
| 31 | #define _HASHTABLE_H 1 |
| 32 | |
| 33 | #pragma GCC system_header |
| 34 | |
| 35 | #include <bits/hashtable_policy.h> |
| 36 | #include <bits/enable_special_members.h> |
| 37 | #include <bits/stl_function.h> // __has_is_transparent_t |
| 38 | #if __cplusplus > 201402L |
| 39 | # include <bits/node_handle.h> |
| 40 | #endif |
| 41 | |
| 42 | namespace std _GLIBCXX_VISIBILITY(default) |
| 43 | { |
| 44 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 45 | /// @cond undocumented |
| 46 | |
| 47 | template<typename _Tp, typename _Hash> |
| 48 | using __cache_default |
| 49 | = __not_<__and_<// Do not cache for fast hasher. |
| 50 | __is_fast_hash<_Hash>, |
| 51 | // Mandatory to have erase not throwing. |
| 52 | __is_nothrow_invocable<const _Hash&, const _Tp&>>>; |
| 53 | |
| 54 | // Helper to conditionally delete the default constructor. |
| 55 | // The _Hash_node_base type is used to distinguish this specialization |
| 56 | // from any other potentially-overlapping subobjects of the hashtable. |
| 57 | template<typename _Equal, typename _Hash, typename _Allocator> |
| 58 | using _Hashtable_enable_default_ctor |
| 59 | = _Enable_default_constructor<__and_<is_default_constructible<_Equal>, |
| 60 | is_default_constructible<_Hash>, |
| 61 | is_default_constructible<_Allocator>>{}, |
| 62 | __detail::_Hash_node_base>; |
| 63 | |
| 64 | /** |
| 65 | * Primary class template _Hashtable. |
| 66 | * |
| 67 | * @ingroup hashtable-detail |
| 68 | * |
| 69 | * @tparam _Value CopyConstructible type. |
| 70 | * |
| 71 | * @tparam _Key CopyConstructible type. |
| 72 | * |
| 73 | * @tparam _Alloc An allocator type |
| 74 | * ([lib.allocator.requirements]) whose _Alloc::value_type is |
| 75 | * _Value. As a conforming extension, we allow for |
| 76 | * _Alloc::value_type != _Value. |
| 77 | * |
| 78 | * @tparam _ExtractKey Function object that takes an object of type |
| 79 | * _Value and returns a value of type _Key. |
| 80 | * |
| 81 | * @tparam _Equal Function object that takes two objects of type k |
| 82 | * and returns a bool-like value that is true if the two objects |
| 83 | * are considered equal. |
| 84 | * |
| 85 | * @tparam _Hash The hash function. A unary function object with |
| 86 | * argument type _Key and result type size_t. Return values should |
| 87 | * be distributed over the entire range [0, numeric_limits<size_t>:::max()]. |
| 88 | * |
| 89 | * @tparam _RangeHash The range-hashing function (in the terminology of |
| 90 | * Tavori and Dreizin). A binary function object whose argument |
| 91 | * types and result type are all size_t. Given arguments r and N, |
| 92 | * the return value is in the range [0, N). |
| 93 | * |
| 94 | * @tparam _Unused Not used. |
| 95 | * |
| 96 | * @tparam _RehashPolicy Policy class with three members, all of |
| 97 | * which govern the bucket count. _M_next_bkt(n) returns a bucket |
| 98 | * count no smaller than n. _M_bkt_for_elements(n) returns a |
| 99 | * bucket count appropriate for an element count of n. |
| 100 | * _M_need_rehash(n_bkt, n_elt, n_ins) determines whether, if the |
| 101 | * current bucket count is n_bkt and the current element count is |
| 102 | * n_elt, we need to increase the bucket count for n_ins insertions. |
| 103 | * If so, returns make_pair(true, n), where n is the new bucket count. If |
| 104 | * not, returns make_pair(false, <anything>) |
| 105 | * |
| 106 | * @tparam _Traits Compile-time class with three boolean |
| 107 | * std::integral_constant members: __cache_hash_code, __constant_iterators, |
| 108 | * __unique_keys. |
| 109 | * |
| 110 | * Each _Hashtable data structure has: |
| 111 | * |
| 112 | * - _Bucket[] _M_buckets |
| 113 | * - _Hash_node_base _M_before_begin |
| 114 | * - size_type _M_bucket_count |
| 115 | * - size_type _M_element_count |
| 116 | * |
| 117 | * with _Bucket being _Hash_node_base* and _Hash_node containing: |
| 118 | * |
| 119 | * - _Hash_node* _M_next |
| 120 | * - Tp _M_value |
| 121 | * - size_t _M_hash_code if cache_hash_code is true |
| 122 | * |
| 123 | * In terms of Standard containers the hashtable is like the aggregation of: |
| 124 | * |
| 125 | * - std::forward_list<_Node> containing the elements |
| 126 | * - std::vector<std::forward_list<_Node>::iterator> representing the buckets |
| 127 | * |
| 128 | * The non-empty buckets contain the node before the first node in the |
| 129 | * bucket. This design makes it possible to implement something like a |
| 130 | * std::forward_list::insert_after on container insertion and |
| 131 | * std::forward_list::erase_after on container erase |
| 132 | * calls. _M_before_begin is equivalent to |
| 133 | * std::forward_list::before_begin. Empty buckets contain |
| 134 | * nullptr. Note that one of the non-empty buckets contains |
| 135 | * &_M_before_begin which is not a dereferenceable node so the |
| 136 | * node pointer in a bucket shall never be dereferenced, only its |
| 137 | * next node can be. |
| 138 | * |
| 139 | * Walking through a bucket's nodes requires a check on the hash code to |
| 140 | * see if each node is still in the bucket. Such a design assumes a |
| 141 | * quite efficient hash functor and is one of the reasons it is |
| 142 | * highly advisable to set __cache_hash_code to true. |
| 143 | * |
| 144 | * The container iterators are simply built from nodes. This way |
| 145 | * incrementing the iterator is perfectly efficient independent of |
| 146 | * how many empty buckets there are in the container. |
| 147 | * |
| 148 | * On insert we compute the element's hash code and use it to find the |
| 149 | * bucket index. If the element must be inserted in an empty bucket |
| 150 | * we add it at the beginning of the singly linked list and make the |
| 151 | * bucket point to _M_before_begin. The bucket that used to point to |
| 152 | * _M_before_begin, if any, is updated to point to its new before |
| 153 | * begin node. |
| 154 | * |
| 155 | * Note that all equivalent values, if any, are next to each other, if |
| 156 | * we find a non-equivalent value after an equivalent one it means that |
| 157 | * we won't find any new equivalent value. |
| 158 | * |
| 159 | * On erase, the simple iterator design requires using the hash |
| 160 | * functor to get the index of the bucket to update. For this |
| 161 | * reason, when __cache_hash_code is set to false the hash functor must |
| 162 | * not throw and this is enforced by a static assertion. |
| 163 | * |
| 164 | * Functionality is implemented by decomposition into base classes, |
| 165 | * where the derived _Hashtable class is used in _Map_base, |
| 166 | * _Insert, _Rehash_base, and _Equality base classes to access the |
| 167 | * "this" pointer. _Hashtable_base is used in the base classes as a |
| 168 | * non-recursive, fully-completed-type so that detailed nested type |
| 169 | * information, such as iterator type and node type, can be |
| 170 | * used. This is similar to the "Curiously Recurring Template |
| 171 | * Pattern" (CRTP) technique, but uses a reconstructed, not |
| 172 | * explicitly passed, template pattern. |
| 173 | * |
| 174 | * Base class templates are: |
| 175 | * - __detail::_Hashtable_base |
| 176 | * - __detail::_Map_base |
| 177 | * - __detail::_Insert |
| 178 | * - __detail::_Rehash_base |
| 179 | * - __detail::_Equality |
| 180 | */ |
| 181 | template<typename _Key, typename _Value, typename _Alloc, |
| 182 | typename _ExtractKey, typename _Equal, |
| 183 | typename _Hash, typename _RangeHash, typename _Unused, |
| 184 | typename _RehashPolicy, typename _Traits> |
| 185 | class _Hashtable |
| 186 | : public __detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, |
| 187 | _Hash, _RangeHash, _Unused, _Traits>, |
| 188 | public __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 189 | _Hash, _RangeHash, _Unused, |
| 190 | _RehashPolicy, _Traits>, |
| 191 | public __detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 192 | _Hash, _RangeHash, _Unused, |
| 193 | _RehashPolicy, _Traits>, |
| 194 | public __detail::_Rehash_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 195 | _Hash, _RangeHash, _Unused, |
| 196 | _RehashPolicy, _Traits>, |
| 197 | public __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 198 | _Hash, _RangeHash, _Unused, |
| 199 | _RehashPolicy, _Traits>, |
| 200 | private __detail::_Hashtable_alloc< |
| 201 | __alloc_rebind<_Alloc, |
| 202 | __detail::_Hash_node<_Value, |
| 203 | _Traits::__hash_cached::value>>>, |
| 204 | private _Hashtable_enable_default_ctor<_Equal, _Hash, _Alloc> |
| 205 | { |
| 206 | static_assert(is_same<typename remove_cv<_Value>::type, _Value>::value, |
| 207 | "unordered container must have a non-const, non-volatile value_type"); |
| 208 | #if __cplusplus > 201703L || defined __STRICT_ANSI__ |
| 209 | static_assert(is_same<typename _Alloc::value_type, _Value>{}, |
| 210 | "unordered container must have the same value_type as its allocator"); |
| 211 | #endif |
| 212 | |
| 213 | using __traits_type = _Traits; |
| 214 | using __hash_cached = typename __traits_type::__hash_cached; |
| 215 | using __constant_iterators = typename __traits_type::__constant_iterators; |
| 216 | using __node_type = __detail::_Hash_node<_Value, __hash_cached::value>; |
| 217 | using __node_alloc_type = __alloc_rebind<_Alloc, __node_type>; |
| 218 | |
| 219 | using __hashtable_alloc = __detail::_Hashtable_alloc<__node_alloc_type>; |
| 220 | |
| 221 | using __node_value_type = |
| 222 | __detail::_Hash_node_value<_Value, __hash_cached::value>; |
| 223 | using __node_ptr = typename __hashtable_alloc::__node_ptr; |
| 224 | using __value_alloc_traits = |
| 225 | typename __hashtable_alloc::__value_alloc_traits; |
| 226 | using __node_alloc_traits = |
| 227 | typename __hashtable_alloc::__node_alloc_traits; |
| 228 | using __node_base = typename __hashtable_alloc::__node_base; |
| 229 | using __node_base_ptr = typename __hashtable_alloc::__node_base_ptr; |
| 230 | using __buckets_ptr = typename __hashtable_alloc::__buckets_ptr; |
| 231 | |
| 232 | using __insert_base = __detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, |
| 233 | _Equal, _Hash, |
| 234 | _RangeHash, _Unused, |
| 235 | _RehashPolicy, _Traits>; |
| 236 | using __enable_default_ctor |
| 237 | = _Hashtable_enable_default_ctor<_Equal, _Hash, _Alloc>; |
| 238 | using __rehash_guard_t |
| 239 | = __detail::_RehashStateGuard<_RehashPolicy>; |
| 240 | |
| 241 | public: |
| 242 | typedef _Key key_type; |
| 243 | typedef _Value value_type; |
| 244 | typedef _Alloc allocator_type; |
| 245 | typedef _Equal key_equal; |
| 246 | |
| 247 | // mapped_type, if present, comes from _Map_base. |
| 248 | // hasher, if present, comes from _Hash_code_base/_Hashtable_base. |
| 249 | typedef typename __value_alloc_traits::pointer pointer; |
| 250 | typedef typename __value_alloc_traits::const_pointer const_pointer; |
| 251 | typedef value_type& reference; |
| 252 | typedef const value_type& const_reference; |
| 253 | |
| 254 | using iterator = typename __insert_base::iterator; |
| 255 | |
| 256 | using const_iterator = typename __insert_base::const_iterator; |
| 257 | |
| 258 | using local_iterator = __detail::_Local_iterator<key_type, _Value, |
| 259 | _ExtractKey, _Hash, _RangeHash, _Unused, |
| 260 | __constant_iterators::value, |
| 261 | __hash_cached::value>; |
| 262 | |
| 263 | using const_local_iterator = __detail::_Local_const_iterator< |
| 264 | key_type, _Value, |
| 265 | _ExtractKey, _Hash, _RangeHash, _Unused, |
| 266 | __constant_iterators::value, __hash_cached::value>; |
| 267 | |
| 268 | private: |
| 269 | using __rehash_type = _RehashPolicy; |
| 270 | |
| 271 | using __unique_keys = typename __traits_type::__unique_keys; |
| 272 | |
| 273 | using __hashtable_base = __detail:: |
| 274 | _Hashtable_base<_Key, _Value, _ExtractKey, |
| 275 | _Equal, _Hash, _RangeHash, _Unused, _Traits>; |
| 276 | |
| 277 | using __hash_code_base = typename __hashtable_base::__hash_code_base; |
| 278 | using __hash_code = typename __hashtable_base::__hash_code; |
| 279 | using __ireturn_type = typename __insert_base::__ireturn_type; |
| 280 | |
| 281 | using __map_base = __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey, |
| 282 | _Equal, _Hash, _RangeHash, _Unused, |
| 283 | _RehashPolicy, _Traits>; |
| 284 | |
| 285 | using __rehash_base = __detail::_Rehash_base<_Key, _Value, _Alloc, |
| 286 | _ExtractKey, _Equal, |
| 287 | _Hash, _RangeHash, _Unused, |
| 288 | _RehashPolicy, _Traits>; |
| 289 | |
| 290 | using __eq_base = __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey, |
| 291 | _Equal, _Hash, _RangeHash, _Unused, |
| 292 | _RehashPolicy, _Traits>; |
| 293 | |
| 294 | using __reuse_or_alloc_node_gen_t = |
| 295 | __detail::_ReuseOrAllocNode<__node_alloc_type>; |
| 296 | using __alloc_node_gen_t = |
| 297 | __detail::_AllocNode<__node_alloc_type>; |
| 298 | using __node_builder_t = |
| 299 | __detail::_NodeBuilder<_ExtractKey>; |
| 300 | |
| 301 | // Simple RAII type for managing a node containing an element |
| 302 | struct _Scoped_node |
| 303 | { |
| 304 | // Take ownership of a node with a constructed element. |
| 305 | _Scoped_node(__node_ptr __n, __hashtable_alloc* __h) |
| 306 | : _M_h(__h), _M_node(__n) { } |
| 307 | |
| 308 | // Allocate a node and construct an element within it. |
| 309 | template<typename... _Args> |
| 310 | _Scoped_node(__hashtable_alloc* __h, _Args&&... __args) |
| 311 | : _M_h(__h), |
| 312 | _M_node(__h->_M_allocate_node(std::forward<_Args>(__args)...)) |
| 313 | { } |
| 314 | |
| 315 | // Destroy element and deallocate node. |
| 316 | ~_Scoped_node() { if (_M_node) _M_h->_M_deallocate_node(_M_node); }; |
| 317 | |
| 318 | _Scoped_node(const _Scoped_node&) = delete; |
| 319 | _Scoped_node& operator=(const _Scoped_node&) = delete; |
| 320 | |
| 321 | __hashtable_alloc* _M_h; |
| 322 | __node_ptr _M_node; |
| 323 | }; |
| 324 | |
| 325 | template<typename _Ht> |
| 326 | static constexpr |
| 327 | __conditional_t<std::is_lvalue_reference<_Ht>::value, |
| 328 | const value_type&, value_type&&> |
| 329 | __fwd_value_for(value_type& __val) noexcept |
| 330 | { return std::move(__val); } |
| 331 | |
| 332 | // Compile-time diagnostics. |
| 333 | |
| 334 | // _Hash_code_base has everything protected, so use this derived type to |
| 335 | // access it. |
| 336 | struct __hash_code_base_access : __hash_code_base |
| 337 | { using __hash_code_base::_M_bucket_index; }; |
| 338 | |
| 339 | // To get bucket index we need _RangeHash not to throw. |
| 340 | static_assert(is_nothrow_default_constructible<_RangeHash>::value, |
| 341 | "Functor used to map hash code to bucket index" |
| 342 | " must be nothrow default constructible"); |
| 343 | static_assert(noexcept( |
| 344 | std::declval<const _RangeHash&>()((std::size_t)0, (std::size_t)0)), |
| 345 | "Functor used to map hash code to bucket index must be" |
| 346 | " noexcept"); |
| 347 | |
| 348 | // To compute bucket index we also need _ExtratKey not to throw. |
| 349 | static_assert(is_nothrow_default_constructible<_ExtractKey>::value, |
| 350 | "_ExtractKey must be nothrow default constructible"); |
| 351 | static_assert(noexcept( |
| 352 | std::declval<const _ExtractKey&>()(std::declval<_Value>())), |
| 353 | "_ExtractKey functor must be noexcept invocable"); |
| 354 | |
| 355 | template<typename _Keya, typename _Valuea, typename _Alloca, |
| 356 | typename _ExtractKeya, typename _Equala, |
| 357 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
| 358 | typename _RehashPolicya, typename _Traitsa, |
| 359 | bool _Unique_keysa> |
| 360 | friend struct __detail::_Map_base; |
| 361 | |
| 362 | template<typename _Keya, typename _Valuea, typename _Alloca, |
| 363 | typename _ExtractKeya, typename _Equala, |
| 364 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
| 365 | typename _RehashPolicya, typename _Traitsa> |
| 366 | friend struct __detail::_Insert_base; |
| 367 | |
| 368 | template<typename _Keya, typename _Valuea, typename _Alloca, |
| 369 | typename _ExtractKeya, typename _Equala, |
| 370 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
| 371 | typename _RehashPolicya, typename _Traitsa, |
| 372 | bool _Constant_iteratorsa> |
| 373 | friend struct __detail::_Insert; |
| 374 | |
| 375 | template<typename _Keya, typename _Valuea, typename _Alloca, |
| 376 | typename _ExtractKeya, typename _Equala, |
| 377 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
| 378 | typename _RehashPolicya, typename _Traitsa, |
| 379 | bool _Unique_keysa> |
| 380 | friend struct __detail::_Equality; |
| 381 | |
| 382 | public: |
| 383 | using size_type = typename __hashtable_base::size_type; |
| 384 | using difference_type = typename __hashtable_base::difference_type; |
| 385 | |
| 386 | #if __cplusplus > 201402L |
| 387 | using node_type = _Node_handle<_Key, _Value, __node_alloc_type>; |
| 388 | using insert_return_type = _Node_insert_return<iterator, node_type>; |
| 389 | #endif |
| 390 | |
| 391 | private: |
| 392 | __buckets_ptr _M_buckets = &_M_single_bucket; |
| 393 | size_type _M_bucket_count = 1; |
| 394 | __node_base _M_before_begin; |
| 395 | size_type _M_element_count = 0; |
| 396 | _RehashPolicy _M_rehash_policy; |
| 397 | |
| 398 | // A single bucket used when only need for 1 bucket. Especially |
| 399 | // interesting in move semantic to leave hashtable with only 1 bucket |
| 400 | // which is not allocated so that we can have those operations noexcept |
| 401 | // qualified. |
| 402 | // Note that we can't leave hashtable with 0 bucket without adding |
| 403 | // numerous checks in the code to avoid 0 modulus. |
| 404 | __node_base_ptr _M_single_bucket = nullptr; |
| 405 | |
| 406 | void |
| 407 | _M_update_bbegin() |
| 408 | { |
| 409 | if (auto __begin = _M_begin()) |
| 410 | _M_buckets[_M_bucket_index(*__begin)] = &_M_before_begin; |
| 411 | } |
| 412 | |
| 413 | void |
| 414 | _M_update_bbegin(__node_ptr __n) |
| 415 | { |
| 416 | _M_before_begin._M_nxt = __n; |
| 417 | _M_update_bbegin(); |
| 418 | } |
| 419 | |
| 420 | bool |
| 421 | _M_uses_single_bucket(__buckets_ptr __bkts) const |
| 422 | { return __builtin_expect(__bkts == &_M_single_bucket, false); } |
| 423 | |
| 424 | bool |
| 425 | _M_uses_single_bucket() const |
| 426 | { return _M_uses_single_bucket(_M_buckets); } |
| 427 | |
| 428 | static constexpr size_t |
| 429 | __small_size_threshold() noexcept |
| 430 | { |
| 431 | return |
| 432 | __detail::_Hashtable_hash_traits<_Hash>::__small_size_threshold(); |
| 433 | } |
| 434 | |
| 435 | __hashtable_alloc& |
| 436 | _M_base_alloc() { return *this; } |
| 437 | |
| 438 | __buckets_ptr |
| 439 | _M_allocate_buckets(size_type __bkt_count) |
| 440 | { |
| 441 | if (__builtin_expect(__bkt_count == 1, false)) |
| 442 | { |
| 443 | _M_single_bucket = nullptr; |
| 444 | return &_M_single_bucket; |
| 445 | } |
| 446 | |
| 447 | return __hashtable_alloc::_M_allocate_buckets(__bkt_count); |
| 448 | } |
| 449 | |
| 450 | void |
| 451 | _M_deallocate_buckets(__buckets_ptr __bkts, size_type __bkt_count) |
| 452 | { |
| 453 | if (_M_uses_single_bucket(__bkts)) |
| 454 | return; |
| 455 | |
| 456 | __hashtable_alloc::_M_deallocate_buckets(__bkts, __bkt_count); |
| 457 | } |
| 458 | |
| 459 | void |
| 460 | _M_deallocate_buckets() |
| 461 | { _M_deallocate_buckets(_M_buckets, _M_bucket_count); } |
| 462 | |
| 463 | // Gets bucket begin, deals with the fact that non-empty buckets contain |
| 464 | // their before begin node. |
| 465 | __node_ptr |
| 466 | _M_bucket_begin(size_type __bkt) const |
| 467 | { |
| 468 | __node_base_ptr __n = _M_buckets[__bkt]; |
| 469 | return __n ? static_cast<__node_ptr>(__n->_M_nxt) : nullptr; |
| 470 | } |
| 471 | |
| 472 | __node_ptr |
| 473 | _M_begin() const |
| 474 | { return static_cast<__node_ptr>(_M_before_begin._M_nxt); } |
| 475 | |
| 476 | // Assign *this using another _Hashtable instance. Whether elements |
| 477 | // are copied or moved depends on the _Ht reference. |
| 478 | template<typename _Ht> |
| 479 | void |
| 480 | _M_assign_elements(_Ht&&); |
| 481 | |
| 482 | template<typename _Ht, typename _NodeGenerator> |
| 483 | void |
| 484 | _M_assign(_Ht&&, const _NodeGenerator&); |
| 485 | |
| 486 | void |
| 487 | _M_move_assign(_Hashtable&&, true_type); |
| 488 | |
| 489 | void |
| 490 | _M_move_assign(_Hashtable&&, false_type); |
| 491 | |
| 492 | void |
| 493 | _M_reset() noexcept; |
| 494 | |
| 495 | _Hashtable(const _Hash& __h, const _Equal& __eq, |
| 496 | const allocator_type& __a) |
| 497 | : __hashtable_base(__h, __eq), |
| 498 | __hashtable_alloc(__node_alloc_type(__a)), |
| 499 | __enable_default_ctor(_Enable_default_constructor_tag{}) |
| 500 | { } |
| 501 | |
| 502 | template<bool _No_realloc = true> |
| 503 | static constexpr bool |
| 504 | _S_nothrow_move() |
| 505 | { |
| 506 | #if __cplusplus <= 201402L |
| 507 | return __and_<__bool_constant<_No_realloc>, |
| 508 | is_nothrow_copy_constructible<_Hash>, |
| 509 | is_nothrow_copy_constructible<_Equal>>::value; |
| 510 | #else |
| 511 | if constexpr (_No_realloc) |
| 512 | if constexpr (is_nothrow_copy_constructible<_Hash>()) |
| 513 | return is_nothrow_copy_constructible<_Equal>(); |
| 514 | return false; |
| 515 | #endif |
| 516 | } |
| 517 | |
| 518 | _Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, |
| 519 | true_type /* alloc always equal */) |
| 520 | noexcept(_S_nothrow_move()); |
| 521 | |
| 522 | _Hashtable(_Hashtable&&, __node_alloc_type&&, |
| 523 | false_type /* alloc always equal */); |
| 524 | |
| 525 | template<typename _InputIterator> |
| 526 | _Hashtable(_InputIterator __first, _InputIterator __last, |
| 527 | size_type __bkt_count_hint, |
| 528 | const _Hash&, const _Equal&, const allocator_type&, |
| 529 | true_type __uks); |
| 530 | |
| 531 | template<typename _InputIterator> |
| 532 | _Hashtable(_InputIterator __first, _InputIterator __last, |
| 533 | size_type __bkt_count_hint, |
| 534 | const _Hash&, const _Equal&, const allocator_type&, |
| 535 | false_type __uks); |
| 536 | |
| 537 | public: |
| 538 | // Constructor, destructor, assignment, swap |
| 539 | _Hashtable() = default; |
| 540 | |
| 541 | _Hashtable(const _Hashtable&); |
| 542 | |
| 543 | _Hashtable(const _Hashtable&, const allocator_type&); |
| 544 | |
| 545 | explicit |
| 546 | _Hashtable(size_type __bkt_count_hint, |
| 547 | const _Hash& __hf = _Hash(), |
| 548 | const key_equal& __eql = key_equal(), |
| 549 | const allocator_type& __a = allocator_type()); |
| 550 | |
| 551 | // Use delegating constructors. |
| 552 | _Hashtable(_Hashtable&& __ht) |
| 553 | noexcept(_S_nothrow_move()) |
| 554 | : _Hashtable(std::move(__ht), std::move(__ht._M_node_allocator()), |
| 555 | true_type{}) |
| 556 | { } |
| 557 | |
| 558 | _Hashtable(_Hashtable&& __ht, const allocator_type& __a) |
| 559 | noexcept(_S_nothrow_move<__node_alloc_traits::_S_always_equal()>()) |
| 560 | : _Hashtable(std::move(__ht), __node_alloc_type(__a), |
| 561 | typename __node_alloc_traits::is_always_equal{}) |
| 562 | { } |
| 563 | |
| 564 | explicit |
| 565 | _Hashtable(const allocator_type& __a) |
| 566 | : __hashtable_alloc(__node_alloc_type(__a)), |
| 567 | __enable_default_ctor(_Enable_default_constructor_tag{}) |
| 568 | { } |
| 569 | |
| 570 | template<typename _InputIterator> |
| 571 | _Hashtable(_InputIterator __f, _InputIterator __l, |
| 572 | size_type __bkt_count_hint = 0, |
| 573 | const _Hash& __hf = _Hash(), |
| 574 | const key_equal& __eql = key_equal(), |
| 575 | const allocator_type& __a = allocator_type()) |
| 576 | : _Hashtable(__f, __l, __bkt_count_hint, __hf, __eql, __a, |
| 577 | __unique_keys{}) |
| 578 | { } |
| 579 | |
| 580 | _Hashtable(initializer_list<value_type> __l, |
| 581 | size_type __bkt_count_hint = 0, |
| 582 | const _Hash& __hf = _Hash(), |
| 583 | const key_equal& __eql = key_equal(), |
| 584 | const allocator_type& __a = allocator_type()) |
| 585 | : _Hashtable(__l.begin(), __l.end(), __bkt_count_hint, |
| 586 | __hf, __eql, __a, __unique_keys{}) |
| 587 | { } |
| 588 | |
| 589 | _Hashtable& |
| 590 | operator=(const _Hashtable& __ht); |
| 591 | |
| 592 | _Hashtable& |
| 593 | operator=(_Hashtable&& __ht) |
| 594 | noexcept(__node_alloc_traits::_S_nothrow_move() |
| 595 | && is_nothrow_move_assignable<_Hash>::value |
| 596 | && is_nothrow_move_assignable<_Equal>::value) |
| 597 | { |
| 598 | constexpr bool __move_storage = |
| 599 | __node_alloc_traits::_S_propagate_on_move_assign() |
| 600 | || __node_alloc_traits::_S_always_equal(); |
| 601 | _M_move_assign(std::move(__ht), __bool_constant<__move_storage>()); |
| 602 | return *this; |
| 603 | } |
| 604 | |
| 605 | _Hashtable& |
| 606 | operator=(initializer_list<value_type> __l) |
| 607 | { |
| 608 | __reuse_or_alloc_node_gen_t __roan(_M_begin(), *this); |
| 609 | _M_before_begin._M_nxt = nullptr; |
| 610 | clear(); |
| 611 | |
| 612 | // We consider that all elements of __l are going to be inserted. |
| 613 | auto __l_bkt_count = _M_rehash_policy._M_bkt_for_elements(__l.size()); |
| 614 | |
| 615 | // Do not shrink to keep potential user reservation. |
| 616 | if (_M_bucket_count < __l_bkt_count) |
| 617 | rehash(bkt_count: __l_bkt_count); |
| 618 | |
| 619 | this->_M_insert_range(__l.begin(), __l.end(), __roan, __unique_keys{}); |
| 620 | return *this; |
| 621 | } |
| 622 | |
| 623 | ~_Hashtable() noexcept; |
| 624 | |
| 625 | void |
| 626 | swap(_Hashtable&) |
| 627 | noexcept(__and_<__is_nothrow_swappable<_Hash>, |
| 628 | __is_nothrow_swappable<_Equal>>::value); |
| 629 | |
| 630 | // Basic container operations |
| 631 | iterator |
| 632 | begin() noexcept |
| 633 | { return iterator(_M_begin()); } |
| 634 | |
| 635 | const_iterator |
| 636 | begin() const noexcept |
| 637 | { return const_iterator(_M_begin()); } |
| 638 | |
| 639 | iterator |
| 640 | end() noexcept |
| 641 | { return iterator(nullptr); } |
| 642 | |
| 643 | const_iterator |
| 644 | end() const noexcept |
| 645 | { return const_iterator(nullptr); } |
| 646 | |
| 647 | const_iterator |
| 648 | cbegin() const noexcept |
| 649 | { return const_iterator(_M_begin()); } |
| 650 | |
| 651 | const_iterator |
| 652 | cend() const noexcept |
| 653 | { return const_iterator(nullptr); } |
| 654 | |
| 655 | size_type |
| 656 | size() const noexcept |
| 657 | { return _M_element_count; } |
| 658 | |
| 659 | _GLIBCXX_NODISCARD bool |
| 660 | empty() const noexcept |
| 661 | { return size() == 0; } |
| 662 | |
| 663 | allocator_type |
| 664 | get_allocator() const noexcept |
| 665 | { return allocator_type(this->_M_node_allocator()); } |
| 666 | |
| 667 | size_type |
| 668 | max_size() const noexcept |
| 669 | { return __node_alloc_traits::max_size(this->_M_node_allocator()); } |
| 670 | |
| 671 | // Observers |
| 672 | key_equal |
| 673 | key_eq() const |
| 674 | { return this->_M_eq(); } |
| 675 | |
| 676 | // hash_function, if present, comes from _Hash_code_base. |
| 677 | |
| 678 | // Bucket operations |
| 679 | size_type |
| 680 | bucket_count() const noexcept |
| 681 | { return _M_bucket_count; } |
| 682 | |
| 683 | size_type |
| 684 | max_bucket_count() const noexcept |
| 685 | { return max_size(); } |
| 686 | |
| 687 | size_type |
| 688 | bucket_size(size_type __bkt) const |
| 689 | { return std::distance(begin(__bkt), end(__bkt)); } |
| 690 | |
| 691 | size_type |
| 692 | bucket(const key_type& __k) const |
| 693 | { return _M_bucket_index(this->_M_hash_code(__k)); } |
| 694 | |
| 695 | local_iterator |
| 696 | begin(size_type __bkt) |
| 697 | { |
| 698 | return local_iterator(*this, _M_bucket_begin(__bkt), |
| 699 | __bkt, _M_bucket_count); |
| 700 | } |
| 701 | |
| 702 | local_iterator |
| 703 | end(size_type __bkt) |
| 704 | { return local_iterator(*this, nullptr, __bkt, _M_bucket_count); } |
| 705 | |
| 706 | const_local_iterator |
| 707 | begin(size_type __bkt) const |
| 708 | { |
| 709 | return const_local_iterator(*this, _M_bucket_begin(__bkt), |
| 710 | __bkt, _M_bucket_count); |
| 711 | } |
| 712 | |
| 713 | const_local_iterator |
| 714 | end(size_type __bkt) const |
| 715 | { return const_local_iterator(*this, nullptr, __bkt, _M_bucket_count); } |
| 716 | |
| 717 | // DR 691. |
| 718 | const_local_iterator |
| 719 | cbegin(size_type __bkt) const |
| 720 | { |
| 721 | return const_local_iterator(*this, _M_bucket_begin(__bkt), |
| 722 | __bkt, _M_bucket_count); |
| 723 | } |
| 724 | |
| 725 | const_local_iterator |
| 726 | cend(size_type __bkt) const |
| 727 | { return const_local_iterator(*this, nullptr, __bkt, _M_bucket_count); } |
| 728 | |
| 729 | float |
| 730 | load_factor() const noexcept |
| 731 | { |
| 732 | return static_cast<float>(size()) / static_cast<float>(bucket_count()); |
| 733 | } |
| 734 | |
| 735 | // max_load_factor, if present, comes from _Rehash_base. |
| 736 | |
| 737 | // Generalization of max_load_factor. Extension, not found in |
| 738 | // TR1. Only useful if _RehashPolicy is something other than |
| 739 | // the default. |
| 740 | const _RehashPolicy& |
| 741 | __rehash_policy() const |
| 742 | { return _M_rehash_policy; } |
| 743 | |
| 744 | void |
| 745 | __rehash_policy(const _RehashPolicy& __pol) |
| 746 | { _M_rehash_policy = __pol; } |
| 747 | |
| 748 | // Lookup. |
| 749 | iterator |
| 750 | find(const key_type& __k); |
| 751 | |
| 752 | const_iterator |
| 753 | find(const key_type& __k) const; |
| 754 | |
| 755 | size_type |
| 756 | count(const key_type& __k) const; |
| 757 | |
| 758 | std::pair<iterator, iterator> |
| 759 | equal_range(const key_type& __k); |
| 760 | |
| 761 | std::pair<const_iterator, const_iterator> |
| 762 | equal_range(const key_type& __k) const; |
| 763 | |
| 764 | #ifdef __glibcxx_generic_unordered_lookup // C++ >= 20 && HOSTED |
| 765 | template<typename _Kt, |
| 766 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 767 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 768 | iterator |
| 769 | _M_find_tr(const _Kt& __k); |
| 770 | |
| 771 | template<typename _Kt, |
| 772 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 773 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 774 | const_iterator |
| 775 | _M_find_tr(const _Kt& __k) const; |
| 776 | |
| 777 | template<typename _Kt, |
| 778 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 779 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 780 | size_type |
| 781 | _M_count_tr(const _Kt& __k) const; |
| 782 | |
| 783 | template<typename _Kt, |
| 784 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 785 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 786 | pair<iterator, iterator> |
| 787 | _M_equal_range_tr(const _Kt& __k); |
| 788 | |
| 789 | template<typename _Kt, |
| 790 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 791 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 792 | pair<const_iterator, const_iterator> |
| 793 | _M_equal_range_tr(const _Kt& __k) const; |
| 794 | #endif // __glibcxx_generic_unordered_lookup |
| 795 | |
| 796 | private: |
| 797 | // Bucket index computation helpers. |
| 798 | size_type |
| 799 | _M_bucket_index(const __node_value_type& __n) const noexcept |
| 800 | { return __hash_code_base::_M_bucket_index(__n, _M_bucket_count); } |
| 801 | |
| 802 | size_type |
| 803 | _M_bucket_index(__hash_code __c) const |
| 804 | { return __hash_code_base::_M_bucket_index(__c, _M_bucket_count); } |
| 805 | |
| 806 | __node_base_ptr |
| 807 | _M_find_before_node(const key_type&); |
| 808 | |
| 809 | // Find and insert helper functions and types |
| 810 | // Find the node before the one matching the criteria. |
| 811 | __node_base_ptr |
| 812 | _M_find_before_node(size_type, const key_type&, __hash_code) const; |
| 813 | |
| 814 | template<typename _Kt> |
| 815 | __node_base_ptr |
| 816 | _M_find_before_node_tr(size_type, const _Kt&, __hash_code) const; |
| 817 | |
| 818 | __node_ptr |
| 819 | _M_find_node(size_type __bkt, const key_type& __key, |
| 820 | __hash_code __c) const |
| 821 | { |
| 822 | __node_base_ptr __before_n = _M_find_before_node(__bkt, __key, __c); |
| 823 | if (__before_n) |
| 824 | return static_cast<__node_ptr>(__before_n->_M_nxt); |
| 825 | return nullptr; |
| 826 | } |
| 827 | |
| 828 | template<typename _Kt> |
| 829 | __node_ptr |
| 830 | _M_find_node_tr(size_type __bkt, const _Kt& __key, |
| 831 | __hash_code __c) const |
| 832 | { |
| 833 | auto __before_n = _M_find_before_node_tr(__bkt, __key, __c); |
| 834 | if (__before_n) |
| 835 | return static_cast<__node_ptr>(__before_n->_M_nxt); |
| 836 | return nullptr; |
| 837 | } |
| 838 | |
| 839 | // Insert a node at the beginning of a bucket. |
| 840 | void |
| 841 | _M_insert_bucket_begin(size_type __bkt, __node_ptr __node) |
| 842 | { |
| 843 | if (_M_buckets[__bkt]) |
| 844 | { |
| 845 | // Bucket is not empty, we just need to insert the new node |
| 846 | // after the bucket before begin. |
| 847 | __node->_M_nxt = _M_buckets[__bkt]->_M_nxt; |
| 848 | _M_buckets[__bkt]->_M_nxt = __node; |
| 849 | } |
| 850 | else |
| 851 | { |
| 852 | // The bucket is empty, the new node is inserted at the |
| 853 | // beginning of the singly-linked list and the bucket will |
| 854 | // contain _M_before_begin pointer. |
| 855 | __node->_M_nxt = _M_before_begin._M_nxt; |
| 856 | _M_before_begin._M_nxt = __node; |
| 857 | |
| 858 | if (__node->_M_nxt) |
| 859 | // We must update former begin bucket that is pointing to |
| 860 | // _M_before_begin. |
| 861 | _M_buckets[_M_bucket_index(*__node->_M_next())] = __node; |
| 862 | |
| 863 | _M_buckets[__bkt] = &_M_before_begin; |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | // Remove the bucket first node |
| 868 | void |
| 869 | _M_remove_bucket_begin(size_type __bkt, __node_ptr __next_n, |
| 870 | size_type __next_bkt) |
| 871 | { |
| 872 | if (!__next_n) |
| 873 | _M_buckets[__bkt] = nullptr; |
| 874 | else if (__next_bkt != __bkt) |
| 875 | { |
| 876 | _M_buckets[__next_bkt] = _M_buckets[__bkt]; |
| 877 | _M_buckets[__bkt] = nullptr; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | // Get the node before __n in the bucket __bkt |
| 882 | __node_base_ptr |
| 883 | _M_get_previous_node(size_type __bkt, __node_ptr __n); |
| 884 | |
| 885 | pair<__node_ptr, __hash_code> |
| 886 | _M_compute_hash_code(__node_ptr __hint, const key_type& __k) const; |
| 887 | |
| 888 | // Insert node __n with hash code __code, in bucket __bkt if no |
| 889 | // rehash (assumes no element with same key already present). |
| 890 | // Takes ownership of __n if insertion succeeds, throws otherwise. |
| 891 | iterator |
| 892 | _M_insert_unique_node(size_type __bkt, __hash_code, |
| 893 | __node_ptr __n, size_type __n_elt = 1); |
| 894 | |
| 895 | // Insert node __n with key __k and hash code __code. |
| 896 | // Takes ownership of __n if insertion succeeds, throws otherwise. |
| 897 | iterator |
| 898 | _M_insert_multi_node(__node_ptr __hint, |
| 899 | __hash_code __code, __node_ptr __n); |
| 900 | |
| 901 | template<typename... _Args> |
| 902 | std::pair<iterator, bool> |
| 903 | _M_emplace(true_type __uks, _Args&&... __args); |
| 904 | |
| 905 | template<typename... _Args> |
| 906 | iterator |
| 907 | _M_emplace(false_type __uks, _Args&&... __args) |
| 908 | { return _M_emplace(cend(), __uks, std::forward<_Args>(__args)...); } |
| 909 | |
| 910 | // Emplace with hint, useless when keys are unique. |
| 911 | template<typename... _Args> |
| 912 | iterator |
| 913 | _M_emplace(const_iterator, true_type __uks, _Args&&... __args) |
| 914 | { return _M_emplace(__uks, std::forward<_Args>(__args)...).first; } |
| 915 | |
| 916 | template<typename... _Args> |
| 917 | iterator |
| 918 | _M_emplace(const_iterator, false_type __uks, _Args&&... __args); |
| 919 | |
| 920 | template<typename _Kt, typename _Arg, typename _NodeGenerator> |
| 921 | std::pair<iterator, bool> |
| 922 | _M_insert_unique(_Kt&&, _Arg&&, const _NodeGenerator&); |
| 923 | |
| 924 | template<typename _Kt> |
| 925 | static __conditional_t< |
| 926 | __and_<__is_nothrow_invocable<_Hash&, const key_type&>, |
| 927 | __not_<__is_nothrow_invocable<_Hash&, _Kt>>>::value, |
| 928 | key_type, _Kt&&> |
| 929 | _S_forward_key(_Kt&& __k) |
| 930 | { return std::forward<_Kt>(__k); } |
| 931 | |
| 932 | static const key_type& |
| 933 | _S_forward_key(const key_type& __k) |
| 934 | { return __k; } |
| 935 | |
| 936 | static key_type&& |
| 937 | _S_forward_key(key_type&& __k) |
| 938 | { return std::move(__k); } |
| 939 | |
| 940 | template<typename _Arg, typename _NodeGenerator> |
| 941 | std::pair<iterator, bool> |
| 942 | _M_insert_unique_aux(_Arg&& __arg, const _NodeGenerator& __node_gen) |
| 943 | { |
| 944 | return _M_insert_unique( |
| 945 | _S_forward_key(_ExtractKey{}(std::forward<_Arg>(__arg))), |
| 946 | std::forward<_Arg>(__arg), __node_gen); |
| 947 | } |
| 948 | |
| 949 | template<typename _Arg, typename _NodeGenerator> |
| 950 | std::pair<iterator, bool> |
| 951 | _M_insert(_Arg&& __arg, const _NodeGenerator& __node_gen, |
| 952 | true_type /* __uks */) |
| 953 | { |
| 954 | using __to_value |
| 955 | = __detail::_ConvertToValueType<_ExtractKey, value_type>; |
| 956 | return _M_insert_unique_aux( |
| 957 | __to_value{}(std::forward<_Arg>(__arg)), __node_gen); |
| 958 | } |
| 959 | |
| 960 | template<typename _Arg, typename _NodeGenerator> |
| 961 | iterator |
| 962 | _M_insert(_Arg&& __arg, const _NodeGenerator& __node_gen, |
| 963 | false_type __uks) |
| 964 | { |
| 965 | using __to_value |
| 966 | = __detail::_ConvertToValueType<_ExtractKey, value_type>; |
| 967 | return _M_insert(cend(), |
| 968 | __to_value{}(std::forward<_Arg>(__arg)), __node_gen, __uks); |
| 969 | } |
| 970 | |
| 971 | // Insert with hint, not used when keys are unique. |
| 972 | template<typename _Arg, typename _NodeGenerator> |
| 973 | iterator |
| 974 | _M_insert(const_iterator, _Arg&& __arg, |
| 975 | const _NodeGenerator& __node_gen, true_type __uks) |
| 976 | { |
| 977 | return |
| 978 | _M_insert(std::forward<_Arg>(__arg), __node_gen, __uks).first; |
| 979 | } |
| 980 | |
| 981 | // Insert with hint when keys are not unique. |
| 982 | template<typename _Arg, typename _NodeGenerator> |
| 983 | iterator |
| 984 | _M_insert(const_iterator, _Arg&&, |
| 985 | const _NodeGenerator&, false_type __uks); |
| 986 | |
| 987 | size_type |
| 988 | _M_erase(true_type __uks, const key_type&); |
| 989 | |
| 990 | size_type |
| 991 | _M_erase(false_type __uks, const key_type&); |
| 992 | |
| 993 | iterator |
| 994 | _M_erase(size_type __bkt, __node_base_ptr __prev_n, __node_ptr __n); |
| 995 | |
| 996 | public: |
| 997 | // Emplace |
| 998 | template<typename... _Args> |
| 999 | __ireturn_type |
| 1000 | emplace(_Args&&... __args) |
| 1001 | { return _M_emplace(__unique_keys{}, std::forward<_Args>(__args)...); } |
| 1002 | |
| 1003 | template<typename... _Args> |
| 1004 | iterator |
| 1005 | emplace_hint(const_iterator __hint, _Args&&... __args) |
| 1006 | { |
| 1007 | return _M_emplace(__hint, __unique_keys{}, |
| 1008 | std::forward<_Args>(__args)...); |
| 1009 | } |
| 1010 | |
| 1011 | // Insert member functions via inheritance. |
| 1012 | |
| 1013 | // Erase |
| 1014 | iterator |
| 1015 | erase(const_iterator); |
| 1016 | |
| 1017 | // LWG 2059. |
| 1018 | iterator |
| 1019 | erase(iterator __it) |
| 1020 | { return erase(const_iterator(__it)); } |
| 1021 | |
| 1022 | size_type |
| 1023 | erase(const key_type& __k) |
| 1024 | { return _M_erase(__unique_keys{}, __k); } |
| 1025 | |
| 1026 | iterator |
| 1027 | erase(const_iterator, const_iterator); |
| 1028 | |
| 1029 | void |
| 1030 | clear() noexcept; |
| 1031 | |
| 1032 | // Set number of buckets keeping it appropriate for container's number |
| 1033 | // of elements. |
| 1034 | void rehash(size_type __bkt_count); |
| 1035 | |
| 1036 | // DR 1189. |
| 1037 | // reserve, if present, comes from _Rehash_base. |
| 1038 | |
| 1039 | #if __glibcxx_node_extract // >= C++17 |
| 1040 | /// Re-insert an extracted node into a container with unique keys. |
| 1041 | insert_return_type |
| 1042 | _M_reinsert_node(node_type&& __nh) |
| 1043 | { |
| 1044 | insert_return_type __ret; |
| 1045 | if (__nh.empty()) |
| 1046 | __ret.position = end(); |
| 1047 | else |
| 1048 | { |
| 1049 | __glibcxx_assert(get_allocator() == __nh.get_allocator()); |
| 1050 | |
| 1051 | __node_ptr __n = nullptr; |
| 1052 | const key_type& __k = __nh._M_key(); |
| 1053 | const size_type __size = size(); |
| 1054 | if (__size <= __small_size_threshold()) |
| 1055 | { |
| 1056 | for (__n = _M_begin(); __n; __n = __n->_M_next()) |
| 1057 | if (this->_M_key_equals(__k, *__n)) |
| 1058 | break; |
| 1059 | } |
| 1060 | |
| 1061 | __hash_code __code; |
| 1062 | size_type __bkt; |
| 1063 | if (!__n) |
| 1064 | { |
| 1065 | __code = this->_M_hash_code(__k); |
| 1066 | __bkt = _M_bucket_index(__code); |
| 1067 | if (__size > __small_size_threshold()) |
| 1068 | __n = _M_find_node(__bkt, key: __k, c: __code); |
| 1069 | } |
| 1070 | |
| 1071 | if (__n) |
| 1072 | { |
| 1073 | __ret.node = std::move(__nh); |
| 1074 | __ret.position = iterator(__n); |
| 1075 | __ret.inserted = false; |
| 1076 | } |
| 1077 | else |
| 1078 | { |
| 1079 | __ret.position |
| 1080 | = _M_insert_unique_node(__bkt, __code, n: __nh._M_ptr); |
| 1081 | __nh.release(); |
| 1082 | __ret.inserted = true; |
| 1083 | } |
| 1084 | } |
| 1085 | return __ret; |
| 1086 | } |
| 1087 | |
| 1088 | /// Re-insert an extracted node into a container with equivalent keys. |
| 1089 | iterator |
| 1090 | _M_reinsert_node_multi(const_iterator __hint, node_type&& __nh) |
| 1091 | { |
| 1092 | if (__nh.empty()) |
| 1093 | return end(); |
| 1094 | |
| 1095 | __glibcxx_assert(get_allocator() == __nh.get_allocator()); |
| 1096 | |
| 1097 | const key_type& __k = __nh._M_key(); |
| 1098 | auto __code = this->_M_hash_code(__k); |
| 1099 | auto __ret |
| 1100 | = _M_insert_multi_node(hint: __hint._M_cur, __code, n: __nh._M_ptr); |
| 1101 | __nh.release(); |
| 1102 | return __ret; |
| 1103 | } |
| 1104 | |
| 1105 | private: |
| 1106 | node_type |
| 1107 | _M_extract_node(size_t __bkt, __node_base_ptr __prev_n) |
| 1108 | { |
| 1109 | __node_ptr __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
| 1110 | if (__prev_n == _M_buckets[__bkt]) |
| 1111 | _M_remove_bucket_begin(__bkt, next_n: __n->_M_next(), |
| 1112 | next_bkt: __n->_M_nxt ? _M_bucket_index(*__n->_M_next()) : 0); |
| 1113 | else if (__n->_M_nxt) |
| 1114 | { |
| 1115 | size_type __next_bkt = _M_bucket_index(*__n->_M_next()); |
| 1116 | if (__next_bkt != __bkt) |
| 1117 | _M_buckets[__next_bkt] = __prev_n; |
| 1118 | } |
| 1119 | |
| 1120 | __prev_n->_M_nxt = __n->_M_nxt; |
| 1121 | __n->_M_nxt = nullptr; |
| 1122 | --_M_element_count; |
| 1123 | return { __n, this->_M_node_allocator() }; |
| 1124 | } |
| 1125 | |
| 1126 | // Only use the possibly cached node's hash code if its hash function |
| 1127 | // _H2 matches _Hash and is stateless. Otherwise recompute it using _Hash. |
| 1128 | template<typename _H2> |
| 1129 | __hash_code |
| 1130 | _M_src_hash_code(const _H2&, const key_type& __k, |
| 1131 | const __node_value_type& __src_n) const |
| 1132 | { |
| 1133 | if constexpr (std::is_same_v<_H2, _Hash>) |
| 1134 | if constexpr (std::is_empty_v<_Hash>) |
| 1135 | return this->_M_hash_code(__src_n); |
| 1136 | |
| 1137 | return this->_M_hash_code(__k); |
| 1138 | } |
| 1139 | |
| 1140 | public: |
| 1141 | // Extract a node. |
| 1142 | node_type |
| 1143 | extract(const_iterator __pos) |
| 1144 | { |
| 1145 | size_t __bkt = _M_bucket_index(*__pos._M_cur); |
| 1146 | return _M_extract_node(__bkt, |
| 1147 | prev_n: _M_get_previous_node(__bkt, n: __pos._M_cur)); |
| 1148 | } |
| 1149 | |
| 1150 | /// Extract a node. |
| 1151 | node_type |
| 1152 | extract(const _Key& __k) |
| 1153 | { |
| 1154 | node_type __nh; |
| 1155 | __hash_code __code = this->_M_hash_code(__k); |
| 1156 | std::size_t __bkt = _M_bucket_index(__code); |
| 1157 | if (__node_base_ptr __prev_node = _M_find_before_node(__bkt, __k, __code)) |
| 1158 | __nh = _M_extract_node(__bkt, prev_n: __prev_node); |
| 1159 | return __nh; |
| 1160 | } |
| 1161 | |
| 1162 | /// Merge from a compatible container into one with unique keys. |
| 1163 | template<typename _Compatible_Hashtable> |
| 1164 | void |
| 1165 | _M_merge_unique(_Compatible_Hashtable& __src) |
| 1166 | { |
| 1167 | static_assert(is_same_v<typename _Compatible_Hashtable::node_type, |
| 1168 | node_type>, "Node types are compatible"); |
| 1169 | __glibcxx_assert(get_allocator() == __src.get_allocator()); |
| 1170 | |
| 1171 | auto __n_elt = __src.size(); |
| 1172 | for (auto __i = __src.cbegin(), __end = __src.cend(); __i != __end;) |
| 1173 | { |
| 1174 | auto __pos = __i++; |
| 1175 | const size_type __size = size(); |
| 1176 | const key_type& __k = _ExtractKey{}(*__pos); |
| 1177 | if (__size <= __small_size_threshold()) |
| 1178 | { |
| 1179 | bool __found = false; |
| 1180 | for (auto __n = _M_begin(); __n; __n = __n->_M_next()) |
| 1181 | if (this->_M_key_equals(__k, *__n)) |
| 1182 | { |
| 1183 | __found = true; |
| 1184 | break; |
| 1185 | } |
| 1186 | |
| 1187 | if (__found) |
| 1188 | { |
| 1189 | if (__n_elt != 1) |
| 1190 | --__n_elt; |
| 1191 | continue; |
| 1192 | } |
| 1193 | } |
| 1194 | |
| 1195 | __hash_code __code |
| 1196 | = _M_src_hash_code(__src.hash_function(), __k, *__pos._M_cur); |
| 1197 | size_type __bkt = _M_bucket_index(__code); |
| 1198 | if (__size <= __small_size_threshold() |
| 1199 | || _M_find_node(__bkt, key: __k, c: __code) == nullptr) |
| 1200 | { |
| 1201 | auto __nh = __src.extract(__pos); |
| 1202 | _M_insert_unique_node(__bkt, __code, n: __nh._M_ptr, __n_elt); |
| 1203 | __nh.release(); |
| 1204 | __n_elt = 1; |
| 1205 | } |
| 1206 | else if (__n_elt != 1) |
| 1207 | --__n_elt; |
| 1208 | } |
| 1209 | } |
| 1210 | |
| 1211 | /// Merge from a compatible container into one with equivalent keys. |
| 1212 | template<typename _Compatible_Hashtable> |
| 1213 | void |
| 1214 | _M_merge_multi(_Compatible_Hashtable& __src) |
| 1215 | { |
| 1216 | static_assert(is_same_v<typename _Compatible_Hashtable::node_type, |
| 1217 | node_type>, "Node types are compatible"); |
| 1218 | __glibcxx_assert(get_allocator() == __src.get_allocator()); |
| 1219 | |
| 1220 | __node_ptr __hint = nullptr; |
| 1221 | this->reserve(size() + __src.size()); |
| 1222 | for (auto __i = __src.cbegin(), __end = __src.cend(); __i != __end;) |
| 1223 | { |
| 1224 | auto __pos = __i++; |
| 1225 | const key_type& __k = _ExtractKey{}(*__pos); |
| 1226 | __hash_code __code |
| 1227 | = _M_src_hash_code(__src.hash_function(), __k, *__pos._M_cur); |
| 1228 | auto __nh = __src.extract(__pos); |
| 1229 | __hint = _M_insert_multi_node(__hint, __code, n: __nh._M_ptr)._M_cur; |
| 1230 | __nh.release(); |
| 1231 | } |
| 1232 | } |
| 1233 | #endif // C++17 __glibcxx_node_extract |
| 1234 | |
| 1235 | private: |
| 1236 | // Helper rehash method used when keys are unique. |
| 1237 | void _M_rehash(size_type __bkt_count, true_type __uks); |
| 1238 | |
| 1239 | // Helper rehash method used when keys can be non-unique. |
| 1240 | void _M_rehash(size_type __bkt_count, false_type __uks); |
| 1241 | }; |
| 1242 | |
| 1243 | // Definitions of class template _Hashtable's out-of-line member functions. |
| 1244 | template<typename _Key, typename _Value, typename _Alloc, |
| 1245 | typename _ExtractKey, typename _Equal, |
| 1246 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1247 | typename _RehashPolicy, typename _Traits> |
| 1248 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1249 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1250 | _Hashtable(size_type __bkt_count_hint, |
| 1251 | const _Hash& __h, const _Equal& __eq, const allocator_type& __a) |
| 1252 | : _Hashtable(__h, __eq, __a) |
| 1253 | { |
| 1254 | auto __bkt_count = _M_rehash_policy._M_next_bkt(__bkt_count_hint); |
| 1255 | if (__bkt_count > _M_bucket_count) |
| 1256 | { |
| 1257 | _M_buckets = _M_allocate_buckets(__bkt_count); |
| 1258 | _M_bucket_count = __bkt_count; |
| 1259 | } |
| 1260 | } |
| 1261 | |
| 1262 | template<typename _Key, typename _Value, typename _Alloc, |
| 1263 | typename _ExtractKey, typename _Equal, |
| 1264 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1265 | typename _RehashPolicy, typename _Traits> |
| 1266 | template<typename _InputIterator> |
| 1267 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1268 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1269 | _Hashtable(_InputIterator __f, _InputIterator __l, |
| 1270 | size_type __bkt_count_hint, |
| 1271 | const _Hash& __h, const _Equal& __eq, |
| 1272 | const allocator_type& __a, true_type /* __uks */) |
| 1273 | : _Hashtable(__bkt_count_hint, __h, __eq, __a) |
| 1274 | { this->insert(__f, __l); } |
| 1275 | |
| 1276 | template<typename _Key, typename _Value, typename _Alloc, |
| 1277 | typename _ExtractKey, typename _Equal, |
| 1278 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1279 | typename _RehashPolicy, typename _Traits> |
| 1280 | template<typename _InputIterator> |
| 1281 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1282 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1283 | _Hashtable(_InputIterator __f, _InputIterator __l, |
| 1284 | size_type __bkt_count_hint, |
| 1285 | const _Hash& __h, const _Equal& __eq, |
| 1286 | const allocator_type& __a, false_type __uks) |
| 1287 | : _Hashtable(__h, __eq, __a) |
| 1288 | { |
| 1289 | auto __nb_elems = __detail::__distance_fw(__f, __l); |
| 1290 | auto __bkt_count = |
| 1291 | _M_rehash_policy._M_next_bkt( |
| 1292 | std::max(_M_rehash_policy._M_bkt_for_elements(__nb_elems), |
| 1293 | __bkt_count_hint)); |
| 1294 | |
| 1295 | if (__bkt_count > _M_bucket_count) |
| 1296 | { |
| 1297 | _M_buckets = _M_allocate_buckets(__bkt_count); |
| 1298 | _M_bucket_count = __bkt_count; |
| 1299 | } |
| 1300 | |
| 1301 | __alloc_node_gen_t __node_gen(*this); |
| 1302 | for (; __f != __l; ++__f) |
| 1303 | _M_insert(*__f, __node_gen, __uks); |
| 1304 | } |
| 1305 | |
| 1306 | template<typename _Key, typename _Value, typename _Alloc, |
| 1307 | typename _ExtractKey, typename _Equal, |
| 1308 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1309 | typename _RehashPolicy, typename _Traits> |
| 1310 | auto |
| 1311 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1312 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1313 | operator=(const _Hashtable& __ht) |
| 1314 | -> _Hashtable& |
| 1315 | { |
| 1316 | if (&__ht == this) |
| 1317 | return *this; |
| 1318 | |
| 1319 | if (__node_alloc_traits::_S_propagate_on_copy_assign()) |
| 1320 | { |
| 1321 | auto& __this_alloc = this->_M_node_allocator(); |
| 1322 | auto& __that_alloc = __ht._M_node_allocator(); |
| 1323 | if (!__node_alloc_traits::_S_always_equal() |
| 1324 | && __this_alloc != __that_alloc) |
| 1325 | { |
| 1326 | // Replacement allocator cannot free existing storage. |
| 1327 | this->_M_deallocate_nodes(_M_begin()); |
| 1328 | _M_before_begin._M_nxt = nullptr; |
| 1329 | _M_deallocate_buckets(); |
| 1330 | _M_buckets = nullptr; |
| 1331 | std::__alloc_on_copy(__this_alloc, __that_alloc); |
| 1332 | __hashtable_base::operator=(__ht); |
| 1333 | _M_bucket_count = __ht._M_bucket_count; |
| 1334 | _M_element_count = __ht._M_element_count; |
| 1335 | _M_rehash_policy = __ht._M_rehash_policy; |
| 1336 | __alloc_node_gen_t __alloc_node_gen(*this); |
| 1337 | __try |
| 1338 | { |
| 1339 | _M_assign(__ht, __alloc_node_gen); |
| 1340 | } |
| 1341 | __catch(...) |
| 1342 | { |
| 1343 | // _M_assign took care of deallocating all memory. Now we |
| 1344 | // must make sure this instance remains in a usable state. |
| 1345 | _M_reset(); |
| 1346 | __throw_exception_again; |
| 1347 | } |
| 1348 | return *this; |
| 1349 | } |
| 1350 | std::__alloc_on_copy(__this_alloc, __that_alloc); |
| 1351 | } |
| 1352 | |
| 1353 | // Reuse allocated buckets and nodes. |
| 1354 | _M_assign_elements(__ht); |
| 1355 | return *this; |
| 1356 | } |
| 1357 | |
| 1358 | template<typename _Key, typename _Value, typename _Alloc, |
| 1359 | typename _ExtractKey, typename _Equal, |
| 1360 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1361 | typename _RehashPolicy, typename _Traits> |
| 1362 | template<typename _Ht> |
| 1363 | void |
| 1364 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1365 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1366 | _M_assign_elements(_Ht&& __ht) |
| 1367 | { |
| 1368 | __buckets_ptr __former_buckets = nullptr; |
| 1369 | std::size_t __former_bucket_count = _M_bucket_count; |
| 1370 | __rehash_guard_t __rehash_guard(_M_rehash_policy); |
| 1371 | |
| 1372 | if (_M_bucket_count != __ht._M_bucket_count) |
| 1373 | { |
| 1374 | __former_buckets = _M_buckets; |
| 1375 | _M_buckets = _M_allocate_buckets(bkt_count: __ht._M_bucket_count); |
| 1376 | _M_bucket_count = __ht._M_bucket_count; |
| 1377 | } |
| 1378 | else |
| 1379 | __builtin_memset(_M_buckets, 0, |
| 1380 | _M_bucket_count * sizeof(__node_base_ptr)); |
| 1381 | |
| 1382 | __try |
| 1383 | { |
| 1384 | __hashtable_base::operator=(std::forward<_Ht>(__ht)); |
| 1385 | _M_element_count = __ht._M_element_count; |
| 1386 | _M_rehash_policy = __ht._M_rehash_policy; |
| 1387 | __reuse_or_alloc_node_gen_t __roan(_M_begin(), *this); |
| 1388 | _M_before_begin._M_nxt = nullptr; |
| 1389 | _M_assign(std::forward<_Ht>(__ht), __roan); |
| 1390 | if (__former_buckets) |
| 1391 | _M_deallocate_buckets(__former_buckets, __former_bucket_count); |
| 1392 | __rehash_guard._M_guarded_obj = nullptr; |
| 1393 | } |
| 1394 | __catch(...) |
| 1395 | { |
| 1396 | if (__former_buckets) |
| 1397 | { |
| 1398 | // Restore previous buckets. |
| 1399 | _M_deallocate_buckets(); |
| 1400 | _M_buckets = __former_buckets; |
| 1401 | _M_bucket_count = __former_bucket_count; |
| 1402 | } |
| 1403 | __builtin_memset(_M_buckets, 0, |
| 1404 | _M_bucket_count * sizeof(__node_base_ptr)); |
| 1405 | __throw_exception_again; |
| 1406 | } |
| 1407 | } |
| 1408 | |
| 1409 | template<typename _Key, typename _Value, typename _Alloc, |
| 1410 | typename _ExtractKey, typename _Equal, |
| 1411 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1412 | typename _RehashPolicy, typename _Traits> |
| 1413 | template<typename _Ht, typename _NodeGenerator> |
| 1414 | void |
| 1415 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1416 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1417 | _M_assign(_Ht&& __ht, const _NodeGenerator& __node_gen) |
| 1418 | { |
| 1419 | __buckets_ptr __buckets = nullptr; |
| 1420 | if (!_M_buckets) |
| 1421 | _M_buckets = __buckets = _M_allocate_buckets(bkt_count: _M_bucket_count); |
| 1422 | |
| 1423 | __try |
| 1424 | { |
| 1425 | if (!__ht._M_before_begin._M_nxt) |
| 1426 | return; |
| 1427 | |
| 1428 | // First deal with the special first node pointed to by |
| 1429 | // _M_before_begin. |
| 1430 | __node_ptr __ht_n = __ht._M_begin(); |
| 1431 | __node_ptr __this_n |
| 1432 | = __node_gen(__fwd_value_for<_Ht>(__ht_n->_M_v())); |
| 1433 | this->_M_copy_code(*__this_n, *__ht_n); |
| 1434 | _M_update_bbegin(__this_n); |
| 1435 | |
| 1436 | // Then deal with other nodes. |
| 1437 | __node_ptr __prev_n = __this_n; |
| 1438 | for (__ht_n = __ht_n->_M_next(); __ht_n; __ht_n = __ht_n->_M_next()) |
| 1439 | { |
| 1440 | __this_n = __node_gen(__fwd_value_for<_Ht>(__ht_n->_M_v())); |
| 1441 | __prev_n->_M_nxt = __this_n; |
| 1442 | this->_M_copy_code(*__this_n, *__ht_n); |
| 1443 | size_type __bkt = _M_bucket_index(*__this_n); |
| 1444 | if (!_M_buckets[__bkt]) |
| 1445 | _M_buckets[__bkt] = __prev_n; |
| 1446 | __prev_n = __this_n; |
| 1447 | } |
| 1448 | } |
| 1449 | __catch(...) |
| 1450 | { |
| 1451 | clear(); |
| 1452 | if (__buckets) |
| 1453 | _M_deallocate_buckets(); |
| 1454 | __throw_exception_again; |
| 1455 | } |
| 1456 | } |
| 1457 | |
| 1458 | template<typename _Key, typename _Value, typename _Alloc, |
| 1459 | typename _ExtractKey, typename _Equal, |
| 1460 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1461 | typename _RehashPolicy, typename _Traits> |
| 1462 | void |
| 1463 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1464 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1465 | _M_reset() noexcept |
| 1466 | { |
| 1467 | _M_rehash_policy._M_reset(); |
| 1468 | _M_bucket_count = 1; |
| 1469 | _M_single_bucket = nullptr; |
| 1470 | _M_buckets = &_M_single_bucket; |
| 1471 | _M_before_begin._M_nxt = nullptr; |
| 1472 | _M_element_count = 0; |
| 1473 | } |
| 1474 | |
| 1475 | template<typename _Key, typename _Value, typename _Alloc, |
| 1476 | typename _ExtractKey, typename _Equal, |
| 1477 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1478 | typename _RehashPolicy, typename _Traits> |
| 1479 | void |
| 1480 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1481 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1482 | _M_move_assign(_Hashtable&& __ht, true_type) |
| 1483 | { |
| 1484 | if (__builtin_expect(std::__addressof(__ht) == this, false)) |
| 1485 | return; |
| 1486 | |
| 1487 | this->_M_deallocate_nodes(_M_begin()); |
| 1488 | _M_deallocate_buckets(); |
| 1489 | __hashtable_base::operator=(std::move(__ht)); |
| 1490 | _M_rehash_policy = __ht._M_rehash_policy; |
| 1491 | if (!__ht._M_uses_single_bucket()) |
| 1492 | _M_buckets = __ht._M_buckets; |
| 1493 | else |
| 1494 | { |
| 1495 | _M_buckets = &_M_single_bucket; |
| 1496 | _M_single_bucket = __ht._M_single_bucket; |
| 1497 | } |
| 1498 | |
| 1499 | _M_bucket_count = __ht._M_bucket_count; |
| 1500 | _M_before_begin._M_nxt = __ht._M_before_begin._M_nxt; |
| 1501 | _M_element_count = __ht._M_element_count; |
| 1502 | std::__alloc_on_move(this->_M_node_allocator(), __ht._M_node_allocator()); |
| 1503 | |
| 1504 | // Fix bucket containing the _M_before_begin pointer that can't be moved. |
| 1505 | _M_update_bbegin(); |
| 1506 | __ht._M_reset(); |
| 1507 | } |
| 1508 | |
| 1509 | template<typename _Key, typename _Value, typename _Alloc, |
| 1510 | typename _ExtractKey, typename _Equal, |
| 1511 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1512 | typename _RehashPolicy, typename _Traits> |
| 1513 | void |
| 1514 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1515 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1516 | _M_move_assign(_Hashtable&& __ht, false_type) |
| 1517 | { |
| 1518 | if (__ht._M_node_allocator() == this->_M_node_allocator()) |
| 1519 | _M_move_assign(std::move(__ht), true_type{}); |
| 1520 | else |
| 1521 | { |
| 1522 | // Can't move memory, move elements then. |
| 1523 | _M_assign_elements(std::move(__ht)); |
| 1524 | __ht.clear(); |
| 1525 | } |
| 1526 | } |
| 1527 | |
| 1528 | template<typename _Key, typename _Value, typename _Alloc, |
| 1529 | typename _ExtractKey, typename _Equal, |
| 1530 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1531 | typename _RehashPolicy, typename _Traits> |
| 1532 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1533 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1534 | _Hashtable(const _Hashtable& __ht) |
| 1535 | : __hashtable_base(__ht), |
| 1536 | __map_base(__ht), |
| 1537 | __rehash_base(__ht), |
| 1538 | __hashtable_alloc( |
| 1539 | __node_alloc_traits::_S_select_on_copy(__ht._M_node_allocator())), |
| 1540 | __enable_default_ctor(__ht), |
| 1541 | _M_buckets(nullptr), |
| 1542 | _M_bucket_count(__ht._M_bucket_count), |
| 1543 | _M_element_count(__ht._M_element_count), |
| 1544 | _M_rehash_policy(__ht._M_rehash_policy) |
| 1545 | { |
| 1546 | __alloc_node_gen_t __alloc_node_gen(*this); |
| 1547 | _M_assign(__ht, __alloc_node_gen); |
| 1548 | } |
| 1549 | |
| 1550 | template<typename _Key, typename _Value, typename _Alloc, |
| 1551 | typename _ExtractKey, typename _Equal, |
| 1552 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1553 | typename _RehashPolicy, typename _Traits> |
| 1554 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1555 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1556 | _Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, |
| 1557 | true_type /* alloc always equal */) |
| 1558 | noexcept(_S_nothrow_move()) |
| 1559 | : __hashtable_base(__ht), |
| 1560 | __map_base(__ht), |
| 1561 | __rehash_base(__ht), |
| 1562 | __hashtable_alloc(std::move(__a)), |
| 1563 | __enable_default_ctor(__ht), |
| 1564 | _M_buckets(__ht._M_buckets), |
| 1565 | _M_bucket_count(__ht._M_bucket_count), |
| 1566 | _M_before_begin(__ht._M_before_begin._M_nxt), |
| 1567 | _M_element_count(__ht._M_element_count), |
| 1568 | _M_rehash_policy(__ht._M_rehash_policy) |
| 1569 | { |
| 1570 | // Update buckets if __ht is using its single bucket. |
| 1571 | if (__ht._M_uses_single_bucket()) |
| 1572 | { |
| 1573 | _M_buckets = &_M_single_bucket; |
| 1574 | _M_single_bucket = __ht._M_single_bucket; |
| 1575 | } |
| 1576 | |
| 1577 | // Fix bucket containing the _M_before_begin pointer that can't be moved. |
| 1578 | _M_update_bbegin(); |
| 1579 | |
| 1580 | __ht._M_reset(); |
| 1581 | } |
| 1582 | |
| 1583 | template<typename _Key, typename _Value, typename _Alloc, |
| 1584 | typename _ExtractKey, typename _Equal, |
| 1585 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1586 | typename _RehashPolicy, typename _Traits> |
| 1587 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1588 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1589 | _Hashtable(const _Hashtable& __ht, const allocator_type& __a) |
| 1590 | : __hashtable_base(__ht), |
| 1591 | __map_base(__ht), |
| 1592 | __rehash_base(__ht), |
| 1593 | __hashtable_alloc(__node_alloc_type(__a)), |
| 1594 | __enable_default_ctor(__ht), |
| 1595 | _M_buckets(), |
| 1596 | _M_bucket_count(__ht._M_bucket_count), |
| 1597 | _M_element_count(__ht._M_element_count), |
| 1598 | _M_rehash_policy(__ht._M_rehash_policy) |
| 1599 | { |
| 1600 | __alloc_node_gen_t __alloc_node_gen(*this); |
| 1601 | _M_assign(__ht, __alloc_node_gen); |
| 1602 | } |
| 1603 | |
| 1604 | template<typename _Key, typename _Value, typename _Alloc, |
| 1605 | typename _ExtractKey, typename _Equal, |
| 1606 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1607 | typename _RehashPolicy, typename _Traits> |
| 1608 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1609 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1610 | _Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, |
| 1611 | false_type /* alloc always equal */) |
| 1612 | : __hashtable_base(__ht), |
| 1613 | __map_base(__ht), |
| 1614 | __rehash_base(__ht), |
| 1615 | __hashtable_alloc(std::move(__a)), |
| 1616 | __enable_default_ctor(__ht), |
| 1617 | _M_buckets(nullptr), |
| 1618 | _M_bucket_count(__ht._M_bucket_count), |
| 1619 | _M_element_count(__ht._M_element_count), |
| 1620 | _M_rehash_policy(__ht._M_rehash_policy) |
| 1621 | { |
| 1622 | if (__ht._M_node_allocator() == this->_M_node_allocator()) |
| 1623 | { |
| 1624 | if (__ht._M_uses_single_bucket()) |
| 1625 | { |
| 1626 | _M_buckets = &_M_single_bucket; |
| 1627 | _M_single_bucket = __ht._M_single_bucket; |
| 1628 | } |
| 1629 | else |
| 1630 | _M_buckets = __ht._M_buckets; |
| 1631 | |
| 1632 | // Fix bucket containing the _M_before_begin pointer that can't be |
| 1633 | // moved. |
| 1634 | _M_update_bbegin(__ht._M_begin()); |
| 1635 | |
| 1636 | __ht._M_reset(); |
| 1637 | } |
| 1638 | else |
| 1639 | { |
| 1640 | __alloc_node_gen_t __alloc_gen(*this); |
| 1641 | |
| 1642 | using _Fwd_Ht = __conditional_t< |
| 1643 | __move_if_noexcept_cond<value_type>::value, |
| 1644 | const _Hashtable&, _Hashtable&&>; |
| 1645 | _M_assign(std::forward<_Fwd_Ht>(__ht), __alloc_gen); |
| 1646 | __ht.clear(); |
| 1647 | } |
| 1648 | } |
| 1649 | |
| 1650 | template<typename _Key, typename _Value, typename _Alloc, |
| 1651 | typename _ExtractKey, typename _Equal, |
| 1652 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1653 | typename _RehashPolicy, typename _Traits> |
| 1654 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1655 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1656 | ~_Hashtable() noexcept |
| 1657 | { |
| 1658 | // Getting a bucket index from a node shall not throw because it is used |
| 1659 | // in methods (erase, swap...) that shall not throw. Need a complete |
| 1660 | // type to check this, so do it in the destructor not at class scope. |
| 1661 | static_assert(noexcept(declval<const __hash_code_base_access&>() |
| 1662 | ._M_bucket_index(declval<const __node_value_type&>(), |
| 1663 | (std::size_t)0)), |
| 1664 | "Cache the hash code or qualify your functors involved" |
| 1665 | " in hash code and bucket index computation with noexcept"); |
| 1666 | |
| 1667 | clear(); |
| 1668 | _M_deallocate_buckets(); |
| 1669 | } |
| 1670 | |
| 1671 | template<typename _Key, typename _Value, typename _Alloc, |
| 1672 | typename _ExtractKey, typename _Equal, |
| 1673 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1674 | typename _RehashPolicy, typename _Traits> |
| 1675 | void |
| 1676 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1677 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1678 | swap(_Hashtable& __x) |
| 1679 | noexcept(__and_<__is_nothrow_swappable<_Hash>, |
| 1680 | __is_nothrow_swappable<_Equal>>::value) |
| 1681 | { |
| 1682 | // The only base class with member variables is hash_code_base. |
| 1683 | // We define _Hash_code_base::_M_swap because different |
| 1684 | // specializations have different members. |
| 1685 | this->_M_swap(__x); |
| 1686 | |
| 1687 | std::__alloc_on_swap(this->_M_node_allocator(), __x._M_node_allocator()); |
| 1688 | std::swap(_M_rehash_policy, __x._M_rehash_policy); |
| 1689 | |
| 1690 | // Deal properly with potentially moved instances. |
| 1691 | if (this->_M_uses_single_bucket()) |
| 1692 | { |
| 1693 | if (!__x._M_uses_single_bucket()) |
| 1694 | { |
| 1695 | _M_buckets = __x._M_buckets; |
| 1696 | __x._M_buckets = &__x._M_single_bucket; |
| 1697 | } |
| 1698 | } |
| 1699 | else if (__x._M_uses_single_bucket()) |
| 1700 | { |
| 1701 | __x._M_buckets = _M_buckets; |
| 1702 | _M_buckets = &_M_single_bucket; |
| 1703 | } |
| 1704 | else |
| 1705 | std::swap(_M_buckets, __x._M_buckets); |
| 1706 | |
| 1707 | std::swap(_M_bucket_count, __x._M_bucket_count); |
| 1708 | std::swap(_M_before_begin._M_nxt, __x._M_before_begin._M_nxt); |
| 1709 | std::swap(_M_element_count, __x._M_element_count); |
| 1710 | std::swap(_M_single_bucket, __x._M_single_bucket); |
| 1711 | |
| 1712 | // Fix buckets containing the _M_before_begin pointers that can't be |
| 1713 | // swapped. |
| 1714 | _M_update_bbegin(); |
| 1715 | __x._M_update_bbegin(); |
| 1716 | } |
| 1717 | |
| 1718 | template<typename _Key, typename _Value, typename _Alloc, |
| 1719 | typename _ExtractKey, typename _Equal, |
| 1720 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1721 | typename _RehashPolicy, typename _Traits> |
| 1722 | auto |
| 1723 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1724 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1725 | find(const key_type& __k) |
| 1726 | -> iterator |
| 1727 | { |
| 1728 | if (size() <= __small_size_threshold()) |
| 1729 | { |
| 1730 | for (auto __it = _M_begin(); __it; __it = __it->_M_next()) |
| 1731 | if (this->_M_key_equals(__k, *__it)) |
| 1732 | return iterator(__it); |
| 1733 | return end(); |
| 1734 | } |
| 1735 | |
| 1736 | __hash_code __code = this->_M_hash_code(__k); |
| 1737 | std::size_t __bkt = _M_bucket_index(__code); |
| 1738 | return iterator(_M_find_node(__bkt, key: __k, c: __code)); |
| 1739 | } |
| 1740 | |
| 1741 | template<typename _Key, typename _Value, typename _Alloc, |
| 1742 | typename _ExtractKey, typename _Equal, |
| 1743 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1744 | typename _RehashPolicy, typename _Traits> |
| 1745 | auto |
| 1746 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1747 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1748 | find(const key_type& __k) const |
| 1749 | -> const_iterator |
| 1750 | { |
| 1751 | if (size() <= __small_size_threshold()) |
| 1752 | { |
| 1753 | for (auto __it = _M_begin(); __it; __it = __it->_M_next()) |
| 1754 | if (this->_M_key_equals(__k, *__it)) |
| 1755 | return const_iterator(__it); |
| 1756 | return end(); |
| 1757 | } |
| 1758 | |
| 1759 | __hash_code __code = this->_M_hash_code(__k); |
| 1760 | std::size_t __bkt = _M_bucket_index(__code); |
| 1761 | return const_iterator(_M_find_node(__bkt, key: __k, c: __code)); |
| 1762 | } |
| 1763 | |
| 1764 | #if __cplusplus > 201703L |
| 1765 | template<typename _Key, typename _Value, typename _Alloc, |
| 1766 | typename _ExtractKey, typename _Equal, |
| 1767 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1768 | typename _RehashPolicy, typename _Traits> |
| 1769 | template<typename _Kt, typename, typename> |
| 1770 | auto |
| 1771 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1772 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1773 | _M_find_tr(const _Kt& __k) |
| 1774 | -> iterator |
| 1775 | { |
| 1776 | if (size() <= __small_size_threshold()) |
| 1777 | { |
| 1778 | for (auto __n = _M_begin(); __n; __n = __n->_M_next()) |
| 1779 | if (this->_M_key_equals_tr(__k, *__n)) |
| 1780 | return iterator(__n); |
| 1781 | return end(); |
| 1782 | } |
| 1783 | |
| 1784 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 1785 | std::size_t __bkt = _M_bucket_index(__code); |
| 1786 | return iterator(_M_find_node_tr(__bkt, __k, __code)); |
| 1787 | } |
| 1788 | |
| 1789 | template<typename _Key, typename _Value, typename _Alloc, |
| 1790 | typename _ExtractKey, typename _Equal, |
| 1791 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1792 | typename _RehashPolicy, typename _Traits> |
| 1793 | template<typename _Kt, typename, typename> |
| 1794 | auto |
| 1795 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1796 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1797 | _M_find_tr(const _Kt& __k) const |
| 1798 | -> const_iterator |
| 1799 | { |
| 1800 | if (size() <= __small_size_threshold()) |
| 1801 | { |
| 1802 | for (auto __n = _M_begin(); __n; __n = __n->_M_next()) |
| 1803 | if (this->_M_key_equals_tr(__k, *__n)) |
| 1804 | return const_iterator(__n); |
| 1805 | return end(); |
| 1806 | } |
| 1807 | |
| 1808 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 1809 | std::size_t __bkt = _M_bucket_index(__code); |
| 1810 | return const_iterator(_M_find_node_tr(__bkt, __k, __code)); |
| 1811 | } |
| 1812 | #endif |
| 1813 | |
| 1814 | template<typename _Key, typename _Value, typename _Alloc, |
| 1815 | typename _ExtractKey, typename _Equal, |
| 1816 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1817 | typename _RehashPolicy, typename _Traits> |
| 1818 | auto |
| 1819 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1820 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1821 | count(const key_type& __k) const |
| 1822 | -> size_type |
| 1823 | { |
| 1824 | auto __it = find(__k); |
| 1825 | if (!__it._M_cur) |
| 1826 | return 0; |
| 1827 | |
| 1828 | if (__unique_keys::value) |
| 1829 | return 1; |
| 1830 | |
| 1831 | size_type __result = 1; |
| 1832 | for (auto __ref = __it++; |
| 1833 | __it._M_cur && this->_M_node_equals(*__ref._M_cur, *__it._M_cur); |
| 1834 | ++__it) |
| 1835 | ++__result; |
| 1836 | |
| 1837 | return __result; |
| 1838 | } |
| 1839 | |
| 1840 | #if __cplusplus > 201703L |
| 1841 | template<typename _Key, typename _Value, typename _Alloc, |
| 1842 | typename _ExtractKey, typename _Equal, |
| 1843 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1844 | typename _RehashPolicy, typename _Traits> |
| 1845 | template<typename _Kt, typename, typename> |
| 1846 | auto |
| 1847 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1848 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1849 | _M_count_tr(const _Kt& __k) const |
| 1850 | -> size_type |
| 1851 | { |
| 1852 | if (size() <= __small_size_threshold()) |
| 1853 | { |
| 1854 | size_type __result = 0; |
| 1855 | for (auto __n = _M_begin(); __n; __n = __n->_M_next()) |
| 1856 | { |
| 1857 | if (this->_M_key_equals_tr(__k, *__n)) |
| 1858 | { |
| 1859 | ++__result; |
| 1860 | continue; |
| 1861 | } |
| 1862 | |
| 1863 | if (__result) |
| 1864 | break; |
| 1865 | } |
| 1866 | |
| 1867 | return __result; |
| 1868 | } |
| 1869 | |
| 1870 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 1871 | std::size_t __bkt = _M_bucket_index(__code); |
| 1872 | auto __n = _M_find_node_tr(__bkt, __k, __code); |
| 1873 | if (!__n) |
| 1874 | return 0; |
| 1875 | |
| 1876 | iterator __it(__n); |
| 1877 | size_type __result = 1; |
| 1878 | for (++__it; |
| 1879 | __it._M_cur && this->_M_equals_tr(__k, __code, *__it._M_cur); |
| 1880 | ++__it) |
| 1881 | ++__result; |
| 1882 | |
| 1883 | return __result; |
| 1884 | } |
| 1885 | #endif |
| 1886 | |
| 1887 | template<typename _Key, typename _Value, typename _Alloc, |
| 1888 | typename _ExtractKey, typename _Equal, |
| 1889 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1890 | typename _RehashPolicy, typename _Traits> |
| 1891 | auto |
| 1892 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1893 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1894 | equal_range(const key_type& __k) |
| 1895 | -> pair<iterator, iterator> |
| 1896 | { |
| 1897 | auto __ite = find(__k); |
| 1898 | if (!__ite._M_cur) |
| 1899 | return { __ite, __ite }; |
| 1900 | |
| 1901 | auto __beg = __ite++; |
| 1902 | if (__unique_keys::value) |
| 1903 | return { __beg, __ite }; |
| 1904 | |
| 1905 | while (__ite._M_cur && this->_M_node_equals(*__beg._M_cur, *__ite._M_cur)) |
| 1906 | ++__ite; |
| 1907 | |
| 1908 | return { __beg, __ite }; |
| 1909 | } |
| 1910 | |
| 1911 | template<typename _Key, typename _Value, typename _Alloc, |
| 1912 | typename _ExtractKey, typename _Equal, |
| 1913 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1914 | typename _RehashPolicy, typename _Traits> |
| 1915 | auto |
| 1916 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1917 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1918 | equal_range(const key_type& __k) const |
| 1919 | -> pair<const_iterator, const_iterator> |
| 1920 | { |
| 1921 | auto __ite = find(__k); |
| 1922 | if (!__ite._M_cur) |
| 1923 | return { __ite, __ite }; |
| 1924 | |
| 1925 | auto __beg = __ite++; |
| 1926 | if (__unique_keys::value) |
| 1927 | return { __beg, __ite }; |
| 1928 | |
| 1929 | while (__ite._M_cur && this->_M_node_equals(*__beg._M_cur, *__ite._M_cur)) |
| 1930 | ++__ite; |
| 1931 | |
| 1932 | return { __beg, __ite }; |
| 1933 | } |
| 1934 | |
| 1935 | #if __cplusplus > 201703L |
| 1936 | template<typename _Key, typename _Value, typename _Alloc, |
| 1937 | typename _ExtractKey, typename _Equal, |
| 1938 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1939 | typename _RehashPolicy, typename _Traits> |
| 1940 | template<typename _Kt, typename, typename> |
| 1941 | auto |
| 1942 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1943 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1944 | _M_equal_range_tr(const _Kt& __k) |
| 1945 | -> pair<iterator, iterator> |
| 1946 | { |
| 1947 | if (size() <= __small_size_threshold()) |
| 1948 | { |
| 1949 | __node_ptr __n, __beg = nullptr; |
| 1950 | for (__n = _M_begin(); __n; __n = __n->_M_next()) |
| 1951 | { |
| 1952 | if (this->_M_key_equals_tr(__k, *__n)) |
| 1953 | { |
| 1954 | if (!__beg) |
| 1955 | __beg = __n; |
| 1956 | continue; |
| 1957 | } |
| 1958 | |
| 1959 | if (__beg) |
| 1960 | break; |
| 1961 | } |
| 1962 | |
| 1963 | return { iterator(__beg), iterator(__n) }; |
| 1964 | } |
| 1965 | |
| 1966 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 1967 | std::size_t __bkt = _M_bucket_index(__code); |
| 1968 | auto __n = _M_find_node_tr(__bkt, __k, __code); |
| 1969 | iterator __ite(__n); |
| 1970 | if (!__n) |
| 1971 | return { __ite, __ite }; |
| 1972 | |
| 1973 | auto __beg = __ite++; |
| 1974 | while (__ite._M_cur && this->_M_equals_tr(__k, __code, *__ite._M_cur)) |
| 1975 | ++__ite; |
| 1976 | |
| 1977 | return { __beg, __ite }; |
| 1978 | } |
| 1979 | |
| 1980 | template<typename _Key, typename _Value, typename _Alloc, |
| 1981 | typename _ExtractKey, typename _Equal, |
| 1982 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1983 | typename _RehashPolicy, typename _Traits> |
| 1984 | template<typename _Kt, typename, typename> |
| 1985 | auto |
| 1986 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1987 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1988 | _M_equal_range_tr(const _Kt& __k) const |
| 1989 | -> pair<const_iterator, const_iterator> |
| 1990 | { |
| 1991 | if (size() <= __small_size_threshold()) |
| 1992 | { |
| 1993 | __node_ptr __n, __beg = nullptr; |
| 1994 | for (__n = _M_begin(); __n; __n = __n->_M_next()) |
| 1995 | { |
| 1996 | if (this->_M_key_equals_tr(__k, *__n)) |
| 1997 | { |
| 1998 | if (!__beg) |
| 1999 | __beg = __n; |
| 2000 | continue; |
| 2001 | } |
| 2002 | |
| 2003 | if (__beg) |
| 2004 | break; |
| 2005 | } |
| 2006 | |
| 2007 | return { const_iterator(__beg), const_iterator(__n) }; |
| 2008 | } |
| 2009 | |
| 2010 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 2011 | std::size_t __bkt = _M_bucket_index(__code); |
| 2012 | auto __n = _M_find_node_tr(__bkt, __k, __code); |
| 2013 | const_iterator __ite(__n); |
| 2014 | if (!__n) |
| 2015 | return { __ite, __ite }; |
| 2016 | |
| 2017 | auto __beg = __ite++; |
| 2018 | while (__ite._M_cur && this->_M_equals_tr(__k, __code, *__ite._M_cur)) |
| 2019 | ++__ite; |
| 2020 | |
| 2021 | return { __beg, __ite }; |
| 2022 | } |
| 2023 | #endif |
| 2024 | |
| 2025 | // Find the node before the one whose key compares equal to k. |
| 2026 | // Return nullptr if no node is found. |
| 2027 | template<typename _Key, typename _Value, typename _Alloc, |
| 2028 | typename _ExtractKey, typename _Equal, |
| 2029 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2030 | typename _RehashPolicy, typename _Traits> |
| 2031 | auto |
| 2032 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2033 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2034 | _M_find_before_node(const key_type& __k) |
| 2035 | -> __node_base_ptr |
| 2036 | { |
| 2037 | __node_base_ptr __prev_p = &_M_before_begin; |
| 2038 | if (!__prev_p->_M_nxt) |
| 2039 | return nullptr; |
| 2040 | |
| 2041 | for (__node_ptr __p = static_cast<__node_ptr>(__prev_p->_M_nxt); |
| 2042 | __p != nullptr; |
| 2043 | __p = __p->_M_next()) |
| 2044 | { |
| 2045 | if (this->_M_key_equals(__k, *__p)) |
| 2046 | return __prev_p; |
| 2047 | |
| 2048 | __prev_p = __p; |
| 2049 | } |
| 2050 | |
| 2051 | return nullptr; |
| 2052 | } |
| 2053 | |
| 2054 | // Find the node before the one whose key compares equal to k in the bucket |
| 2055 | // bkt. Return nullptr if no node is found. |
| 2056 | template<typename _Key, typename _Value, typename _Alloc, |
| 2057 | typename _ExtractKey, typename _Equal, |
| 2058 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2059 | typename _RehashPolicy, typename _Traits> |
| 2060 | auto |
| 2061 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2062 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2063 | _M_find_before_node(size_type __bkt, const key_type& __k, |
| 2064 | __hash_code __code) const |
| 2065 | -> __node_base_ptr |
| 2066 | { |
| 2067 | __node_base_ptr __prev_p = _M_buckets[__bkt]; |
| 2068 | if (!__prev_p) |
| 2069 | return nullptr; |
| 2070 | |
| 2071 | for (__node_ptr __p = static_cast<__node_ptr>(__prev_p->_M_nxt);; |
| 2072 | __p = __p->_M_next()) |
| 2073 | { |
| 2074 | if (this->_M_equals(__k, __code, *__p)) |
| 2075 | return __prev_p; |
| 2076 | |
| 2077 | if (!__p->_M_nxt || _M_bucket_index(*__p->_M_next()) != __bkt) |
| 2078 | break; |
| 2079 | __prev_p = __p; |
| 2080 | } |
| 2081 | |
| 2082 | return nullptr; |
| 2083 | } |
| 2084 | |
| 2085 | template<typename _Key, typename _Value, typename _Alloc, |
| 2086 | typename _ExtractKey, typename _Equal, |
| 2087 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2088 | typename _RehashPolicy, typename _Traits> |
| 2089 | template<typename _Kt> |
| 2090 | auto |
| 2091 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2092 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2093 | _M_find_before_node_tr(size_type __bkt, const _Kt& __k, |
| 2094 | __hash_code __code) const |
| 2095 | -> __node_base_ptr |
| 2096 | { |
| 2097 | __node_base_ptr __prev_p = _M_buckets[__bkt]; |
| 2098 | if (!__prev_p) |
| 2099 | return nullptr; |
| 2100 | |
| 2101 | for (__node_ptr __p = static_cast<__node_ptr>(__prev_p->_M_nxt);; |
| 2102 | __p = __p->_M_next()) |
| 2103 | { |
| 2104 | if (this->_M_equals_tr(__k, __code, *__p)) |
| 2105 | return __prev_p; |
| 2106 | |
| 2107 | if (!__p->_M_nxt || _M_bucket_index(*__p->_M_next()) != __bkt) |
| 2108 | break; |
| 2109 | __prev_p = __p; |
| 2110 | } |
| 2111 | |
| 2112 | return nullptr; |
| 2113 | } |
| 2114 | |
| 2115 | template<typename _Key, typename _Value, typename _Alloc, |
| 2116 | typename _ExtractKey, typename _Equal, |
| 2117 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2118 | typename _RehashPolicy, typename _Traits> |
| 2119 | auto |
| 2120 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2121 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2122 | _M_get_previous_node(size_type __bkt, __node_ptr __n) |
| 2123 | -> __node_base_ptr |
| 2124 | { |
| 2125 | __node_base_ptr __prev_n = _M_buckets[__bkt]; |
| 2126 | while (__prev_n->_M_nxt != __n) |
| 2127 | __prev_n = __prev_n->_M_nxt; |
| 2128 | return __prev_n; |
| 2129 | } |
| 2130 | |
| 2131 | template<typename _Key, typename _Value, typename _Alloc, |
| 2132 | typename _ExtractKey, typename _Equal, |
| 2133 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2134 | typename _RehashPolicy, typename _Traits> |
| 2135 | template<typename... _Args> |
| 2136 | auto |
| 2137 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2138 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2139 | _M_emplace(true_type /* __uks */, _Args&&... __args) |
| 2140 | -> pair<iterator, bool> |
| 2141 | { |
| 2142 | // First build the node to get access to the hash code |
| 2143 | _Scoped_node __node { this, std::forward<_Args>(__args)... }; |
| 2144 | const key_type& __k = _ExtractKey{}(__node._M_node->_M_v()); |
| 2145 | const size_type __size = size(); |
| 2146 | if (__size <= __small_size_threshold()) |
| 2147 | { |
| 2148 | for (auto __it = _M_begin(); __it; __it = __it->_M_next()) |
| 2149 | if (this->_M_key_equals(__k, *__it)) |
| 2150 | // There is already an equivalent node, no insertion |
| 2151 | return { iterator(__it), false }; |
| 2152 | } |
| 2153 | |
| 2154 | __hash_code __code = this->_M_hash_code(__k); |
| 2155 | size_type __bkt = _M_bucket_index(__code); |
| 2156 | if (__size > __small_size_threshold()) |
| 2157 | if (__node_ptr __p = _M_find_node(__bkt, key: __k, c: __code)) |
| 2158 | // There is already an equivalent node, no insertion |
| 2159 | return { iterator(__p), false }; |
| 2160 | |
| 2161 | // Insert the node |
| 2162 | auto __pos = _M_insert_unique_node(__bkt, __code, n: __node._M_node); |
| 2163 | __node._M_node = nullptr; |
| 2164 | return { __pos, true }; |
| 2165 | } |
| 2166 | |
| 2167 | template<typename _Key, typename _Value, typename _Alloc, |
| 2168 | typename _ExtractKey, typename _Equal, |
| 2169 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2170 | typename _RehashPolicy, typename _Traits> |
| 2171 | template<typename... _Args> |
| 2172 | auto |
| 2173 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2174 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2175 | _M_emplace(const_iterator __hint, false_type /* __uks */, |
| 2176 | _Args&&... __args) |
| 2177 | -> iterator |
| 2178 | { |
| 2179 | // First build the node to get its hash code. |
| 2180 | _Scoped_node __node { this, std::forward<_Args>(__args)... }; |
| 2181 | const key_type& __k = _ExtractKey{}(__node._M_node->_M_v()); |
| 2182 | |
| 2183 | auto __res = this->_M_compute_hash_code(__hint._M_cur, __k); |
| 2184 | auto __pos |
| 2185 | = _M_insert_multi_node(hint: __res.first, code: __res.second, n: __node._M_node); |
| 2186 | __node._M_node = nullptr; |
| 2187 | return __pos; |
| 2188 | } |
| 2189 | |
| 2190 | template<typename _Key, typename _Value, typename _Alloc, |
| 2191 | typename _ExtractKey, typename _Equal, |
| 2192 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2193 | typename _RehashPolicy, typename _Traits> |
| 2194 | auto |
| 2195 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2196 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2197 | _M_compute_hash_code(__node_ptr __hint, const key_type& __k) const |
| 2198 | -> pair<__node_ptr, __hash_code> |
| 2199 | { |
| 2200 | if (size() <= __small_size_threshold()) |
| 2201 | { |
| 2202 | if (__hint) |
| 2203 | { |
| 2204 | for (auto __it = __hint; __it; __it = __it->_M_next()) |
| 2205 | if (this->_M_key_equals(__k, *__it)) |
| 2206 | return { __it, this->_M_hash_code(*__it) }; |
| 2207 | } |
| 2208 | |
| 2209 | for (auto __it = _M_begin(); __it != __hint; __it = __it->_M_next()) |
| 2210 | if (this->_M_key_equals(__k, *__it)) |
| 2211 | return { __it, this->_M_hash_code(*__it) }; |
| 2212 | |
| 2213 | __hint = nullptr; |
| 2214 | } |
| 2215 | |
| 2216 | return { __hint, this->_M_hash_code(__k) }; |
| 2217 | } |
| 2218 | |
| 2219 | template<typename _Key, typename _Value, typename _Alloc, |
| 2220 | typename _ExtractKey, typename _Equal, |
| 2221 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2222 | typename _RehashPolicy, typename _Traits> |
| 2223 | auto |
| 2224 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2225 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2226 | _M_insert_unique_node(size_type __bkt, __hash_code __code, |
| 2227 | __node_ptr __node, size_type __n_elt) |
| 2228 | -> iterator |
| 2229 | { |
| 2230 | __rehash_guard_t __rehash_guard(_M_rehash_policy); |
| 2231 | std::pair<bool, std::size_t> __do_rehash |
| 2232 | = _M_rehash_policy._M_need_rehash(_M_bucket_count, _M_element_count, |
| 2233 | __n_elt); |
| 2234 | |
| 2235 | if (__do_rehash.first) |
| 2236 | { |
| 2237 | _M_rehash(__do_rehash.second, true_type{}); |
| 2238 | __bkt = _M_bucket_index(__code); |
| 2239 | } |
| 2240 | |
| 2241 | __rehash_guard._M_guarded_obj = nullptr; |
| 2242 | this->_M_store_code(*__node, __code); |
| 2243 | |
| 2244 | // Always insert at the beginning of the bucket. |
| 2245 | _M_insert_bucket_begin(__bkt, __node); |
| 2246 | ++_M_element_count; |
| 2247 | return iterator(__node); |
| 2248 | } |
| 2249 | |
| 2250 | template<typename _Key, typename _Value, typename _Alloc, |
| 2251 | typename _ExtractKey, typename _Equal, |
| 2252 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2253 | typename _RehashPolicy, typename _Traits> |
| 2254 | auto |
| 2255 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2256 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2257 | _M_insert_multi_node(__node_ptr __hint, |
| 2258 | __hash_code __code, __node_ptr __node) |
| 2259 | -> iterator |
| 2260 | { |
| 2261 | __rehash_guard_t __rehash_guard(_M_rehash_policy); |
| 2262 | std::pair<bool, std::size_t> __do_rehash |
| 2263 | = _M_rehash_policy._M_need_rehash(_M_bucket_count, _M_element_count, 1); |
| 2264 | |
| 2265 | if (__do_rehash.first) |
| 2266 | _M_rehash(__do_rehash.second, false_type{}); |
| 2267 | |
| 2268 | __rehash_guard._M_guarded_obj = nullptr; |
| 2269 | this->_M_store_code(*__node, __code); |
| 2270 | const key_type& __k = _ExtractKey{}(__node->_M_v()); |
| 2271 | size_type __bkt = _M_bucket_index(__code); |
| 2272 | |
| 2273 | // Find the node before an equivalent one or use hint if it exists and |
| 2274 | // if it is equivalent. |
| 2275 | __node_base_ptr __prev |
| 2276 | = __builtin_expect(__hint != nullptr, false) |
| 2277 | && this->_M_equals(__k, __code, *__hint) |
| 2278 | ? __hint |
| 2279 | : _M_find_before_node(__bkt, __k, __code); |
| 2280 | |
| 2281 | if (__prev) |
| 2282 | { |
| 2283 | // Insert after the node before the equivalent one. |
| 2284 | __node->_M_nxt = __prev->_M_nxt; |
| 2285 | __prev->_M_nxt = __node; |
| 2286 | if (__builtin_expect(__prev == __hint, false)) |
| 2287 | // hint might be the last bucket node, in this case we need to |
| 2288 | // update next bucket. |
| 2289 | if (__node->_M_nxt |
| 2290 | && !this->_M_equals(__k, __code, *__node->_M_next())) |
| 2291 | { |
| 2292 | size_type __next_bkt = _M_bucket_index(*__node->_M_next()); |
| 2293 | if (__next_bkt != __bkt) |
| 2294 | _M_buckets[__next_bkt] = __node; |
| 2295 | } |
| 2296 | } |
| 2297 | else |
| 2298 | // The inserted node has no equivalent in the hashtable. We must |
| 2299 | // insert the new node at the beginning of the bucket to preserve |
| 2300 | // equivalent elements' relative positions. |
| 2301 | _M_insert_bucket_begin(__bkt, __node); |
| 2302 | ++_M_element_count; |
| 2303 | return iterator(__node); |
| 2304 | } |
| 2305 | |
| 2306 | // Insert v if no element with its key is already present. |
| 2307 | template<typename _Key, typename _Value, typename _Alloc, |
| 2308 | typename _ExtractKey, typename _Equal, |
| 2309 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2310 | typename _RehashPolicy, typename _Traits> |
| 2311 | template<typename _Kt, typename _Arg, typename _NodeGenerator> |
| 2312 | auto |
| 2313 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2314 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2315 | _M_insert_unique(_Kt&& __k, _Arg&& __v, |
| 2316 | const _NodeGenerator& __node_gen) |
| 2317 | -> pair<iterator, bool> |
| 2318 | { |
| 2319 | const size_type __size = size(); |
| 2320 | if (__size <= __small_size_threshold()) |
| 2321 | for (auto __it = _M_begin(); __it; __it = __it->_M_next()) |
| 2322 | if (this->_M_key_equals_tr(__k, *__it)) |
| 2323 | return { iterator(__it), false }; |
| 2324 | |
| 2325 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 2326 | size_type __bkt = _M_bucket_index(__code); |
| 2327 | |
| 2328 | if (__size > __small_size_threshold()) |
| 2329 | if (__node_ptr __node = _M_find_node_tr(__bkt, __k, __code)) |
| 2330 | return { iterator(__node), false }; |
| 2331 | |
| 2332 | _Scoped_node __node { |
| 2333 | __node_builder_t::_S_build(std::forward<_Kt>(__k), |
| 2334 | std::forward<_Arg>(__v), |
| 2335 | __node_gen), |
| 2336 | this |
| 2337 | }; |
| 2338 | auto __pos |
| 2339 | = _M_insert_unique_node(__bkt, __code, node: __node._M_node); |
| 2340 | __node._M_node = nullptr; |
| 2341 | return { __pos, true }; |
| 2342 | } |
| 2343 | |
| 2344 | // Insert v unconditionally. |
| 2345 | template<typename _Key, typename _Value, typename _Alloc, |
| 2346 | typename _ExtractKey, typename _Equal, |
| 2347 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2348 | typename _RehashPolicy, typename _Traits> |
| 2349 | template<typename _Arg, typename _NodeGenerator> |
| 2350 | auto |
| 2351 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2352 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2353 | _M_insert(const_iterator __hint, _Arg&& __v, |
| 2354 | const _NodeGenerator& __node_gen, |
| 2355 | false_type /* __uks */) |
| 2356 | -> iterator |
| 2357 | { |
| 2358 | // First allocate new node so that we don't do anything if it throws. |
| 2359 | _Scoped_node __node{ __node_gen(std::forward<_Arg>(__v)), this }; |
| 2360 | |
| 2361 | // Second compute the hash code so that we don't rehash if it throws. |
| 2362 | auto __res = this->_M_compute_hash_code( |
| 2363 | __hint._M_cur, _ExtractKey{}(__node._M_node->_M_v())); |
| 2364 | |
| 2365 | auto __pos |
| 2366 | = _M_insert_multi_node(hint: __res.first, code: __res.second, node: __node._M_node); |
| 2367 | __node._M_node = nullptr; |
| 2368 | return __pos; |
| 2369 | } |
| 2370 | |
| 2371 | template<typename _Key, typename _Value, typename _Alloc, |
| 2372 | typename _ExtractKey, typename _Equal, |
| 2373 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2374 | typename _RehashPolicy, typename _Traits> |
| 2375 | auto |
| 2376 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2377 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2378 | erase(const_iterator __it) |
| 2379 | -> iterator |
| 2380 | { |
| 2381 | __node_ptr __n = __it._M_cur; |
| 2382 | std::size_t __bkt = _M_bucket_index(*__n); |
| 2383 | |
| 2384 | // Look for previous node to unlink it from the erased one, this |
| 2385 | // is why we need buckets to contain the before begin to make |
| 2386 | // this search fast. |
| 2387 | __node_base_ptr __prev_n = _M_get_previous_node(__bkt, __n); |
| 2388 | return _M_erase(__bkt, __prev_n, __n); |
| 2389 | } |
| 2390 | |
| 2391 | template<typename _Key, typename _Value, typename _Alloc, |
| 2392 | typename _ExtractKey, typename _Equal, |
| 2393 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2394 | typename _RehashPolicy, typename _Traits> |
| 2395 | auto |
| 2396 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2397 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2398 | _M_erase(size_type __bkt, __node_base_ptr __prev_n, __node_ptr __n) |
| 2399 | -> iterator |
| 2400 | { |
| 2401 | if (__prev_n == _M_buckets[__bkt]) |
| 2402 | _M_remove_bucket_begin(__bkt, next_n: __n->_M_next(), |
| 2403 | next_bkt: __n->_M_nxt ? _M_bucket_index(*__n->_M_next()) : 0); |
| 2404 | else if (__n->_M_nxt) |
| 2405 | { |
| 2406 | size_type __next_bkt = _M_bucket_index(*__n->_M_next()); |
| 2407 | if (__next_bkt != __bkt) |
| 2408 | _M_buckets[__next_bkt] = __prev_n; |
| 2409 | } |
| 2410 | |
| 2411 | __prev_n->_M_nxt = __n->_M_nxt; |
| 2412 | iterator __result(__n->_M_next()); |
| 2413 | this->_M_deallocate_node(__n); |
| 2414 | --_M_element_count; |
| 2415 | |
| 2416 | return __result; |
| 2417 | } |
| 2418 | |
| 2419 | template<typename _Key, typename _Value, typename _Alloc, |
| 2420 | typename _ExtractKey, typename _Equal, |
| 2421 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2422 | typename _RehashPolicy, typename _Traits> |
| 2423 | auto |
| 2424 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2425 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2426 | _M_erase(true_type /* __uks */, const key_type& __k) |
| 2427 | -> size_type |
| 2428 | { |
| 2429 | __node_base_ptr __prev_n; |
| 2430 | __node_ptr __n; |
| 2431 | std::size_t __bkt; |
| 2432 | if (size() <= __small_size_threshold()) |
| 2433 | { |
| 2434 | __prev_n = _M_find_before_node(__k); |
| 2435 | if (!__prev_n) |
| 2436 | return 0; |
| 2437 | |
| 2438 | // We found a matching node, erase it. |
| 2439 | __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
| 2440 | __bkt = _M_bucket_index(*__n); |
| 2441 | } |
| 2442 | else |
| 2443 | { |
| 2444 | __hash_code __code = this->_M_hash_code(__k); |
| 2445 | __bkt = _M_bucket_index(__code); |
| 2446 | |
| 2447 | // Look for the node before the first matching node. |
| 2448 | __prev_n = _M_find_before_node(__bkt, __k, __code); |
| 2449 | if (!__prev_n) |
| 2450 | return 0; |
| 2451 | |
| 2452 | // We found a matching node, erase it. |
| 2453 | __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
| 2454 | } |
| 2455 | |
| 2456 | _M_erase(__bkt, __prev_n, __n); |
| 2457 | return 1; |
| 2458 | } |
| 2459 | |
| 2460 | template<typename _Key, typename _Value, typename _Alloc, |
| 2461 | typename _ExtractKey, typename _Equal, |
| 2462 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2463 | typename _RehashPolicy, typename _Traits> |
| 2464 | auto |
| 2465 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2466 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2467 | _M_erase(false_type /* __uks */, const key_type& __k) |
| 2468 | -> size_type |
| 2469 | { |
| 2470 | std::size_t __bkt; |
| 2471 | __node_base_ptr __prev_n; |
| 2472 | __node_ptr __n; |
| 2473 | if (size() <= __small_size_threshold()) |
| 2474 | { |
| 2475 | __prev_n = _M_find_before_node(__k); |
| 2476 | if (!__prev_n) |
| 2477 | return 0; |
| 2478 | |
| 2479 | // We found a matching node, erase it. |
| 2480 | __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
| 2481 | __bkt = _M_bucket_index(*__n); |
| 2482 | } |
| 2483 | else |
| 2484 | { |
| 2485 | __hash_code __code = this->_M_hash_code(__k); |
| 2486 | __bkt = _M_bucket_index(__code); |
| 2487 | |
| 2488 | // Look for the node before the first matching node. |
| 2489 | __prev_n = _M_find_before_node(__bkt, __k, __code); |
| 2490 | if (!__prev_n) |
| 2491 | return 0; |
| 2492 | |
| 2493 | __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
| 2494 | } |
| 2495 | |
| 2496 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2497 | // 526. Is it undefined if a function in the standard changes |
| 2498 | // in parameters? |
| 2499 | // We use one loop to find all matching nodes and another to deallocate |
| 2500 | // them so that the key stays valid during the first loop. It might be |
| 2501 | // invalidated indirectly when destroying nodes. |
| 2502 | __node_ptr __n_last = __n->_M_next(); |
| 2503 | while (__n_last && this->_M_node_equals(*__n, *__n_last)) |
| 2504 | __n_last = __n_last->_M_next(); |
| 2505 | |
| 2506 | std::size_t __n_last_bkt = __n_last ? _M_bucket_index(*__n_last) : __bkt; |
| 2507 | |
| 2508 | // Deallocate nodes. |
| 2509 | size_type __result = 0; |
| 2510 | do |
| 2511 | { |
| 2512 | __node_ptr __p = __n->_M_next(); |
| 2513 | this->_M_deallocate_node(__n); |
| 2514 | __n = __p; |
| 2515 | ++__result; |
| 2516 | } |
| 2517 | while (__n != __n_last); |
| 2518 | |
| 2519 | _M_element_count -= __result; |
| 2520 | if (__prev_n == _M_buckets[__bkt]) |
| 2521 | _M_remove_bucket_begin(__bkt, next_n: __n_last, next_bkt: __n_last_bkt); |
| 2522 | else if (__n_last_bkt != __bkt) |
| 2523 | _M_buckets[__n_last_bkt] = __prev_n; |
| 2524 | __prev_n->_M_nxt = __n_last; |
| 2525 | return __result; |
| 2526 | } |
| 2527 | |
| 2528 | template<typename _Key, typename _Value, typename _Alloc, |
| 2529 | typename _ExtractKey, typename _Equal, |
| 2530 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2531 | typename _RehashPolicy, typename _Traits> |
| 2532 | auto |
| 2533 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2534 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2535 | erase(const_iterator __first, const_iterator __last) |
| 2536 | -> iterator |
| 2537 | { |
| 2538 | __node_ptr __n = __first._M_cur; |
| 2539 | __node_ptr __last_n = __last._M_cur; |
| 2540 | if (__n == __last_n) |
| 2541 | return iterator(__n); |
| 2542 | |
| 2543 | std::size_t __bkt = _M_bucket_index(*__n); |
| 2544 | |
| 2545 | __node_base_ptr __prev_n = _M_get_previous_node(__bkt, __n); |
| 2546 | bool __is_bucket_begin = __n == _M_bucket_begin(__bkt); |
| 2547 | std::size_t __n_bkt = __bkt; |
| 2548 | for (;;) |
| 2549 | { |
| 2550 | do |
| 2551 | { |
| 2552 | __node_ptr __tmp = __n; |
| 2553 | __n = __n->_M_next(); |
| 2554 | this->_M_deallocate_node(__tmp); |
| 2555 | --_M_element_count; |
| 2556 | if (!__n) |
| 2557 | break; |
| 2558 | __n_bkt = _M_bucket_index(*__n); |
| 2559 | } |
| 2560 | while (__n != __last_n && __n_bkt == __bkt); |
| 2561 | if (__is_bucket_begin) |
| 2562 | _M_remove_bucket_begin(__bkt, next_n: __n, next_bkt: __n_bkt); |
| 2563 | if (__n == __last_n) |
| 2564 | break; |
| 2565 | __is_bucket_begin = true; |
| 2566 | __bkt = __n_bkt; |
| 2567 | } |
| 2568 | |
| 2569 | if (__n && (__n_bkt != __bkt || __is_bucket_begin)) |
| 2570 | _M_buckets[__n_bkt] = __prev_n; |
| 2571 | __prev_n->_M_nxt = __n; |
| 2572 | return iterator(__n); |
| 2573 | } |
| 2574 | |
| 2575 | template<typename _Key, typename _Value, typename _Alloc, |
| 2576 | typename _ExtractKey, typename _Equal, |
| 2577 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2578 | typename _RehashPolicy, typename _Traits> |
| 2579 | void |
| 2580 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2581 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2582 | clear() noexcept |
| 2583 | { |
| 2584 | this->_M_deallocate_nodes(_M_begin()); |
| 2585 | __builtin_memset(_M_buckets, 0, |
| 2586 | _M_bucket_count * sizeof(__node_base_ptr)); |
| 2587 | _M_element_count = 0; |
| 2588 | _M_before_begin._M_nxt = nullptr; |
| 2589 | } |
| 2590 | |
| 2591 | template<typename _Key, typename _Value, typename _Alloc, |
| 2592 | typename _ExtractKey, typename _Equal, |
| 2593 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2594 | typename _RehashPolicy, typename _Traits> |
| 2595 | void |
| 2596 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2597 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2598 | rehash(size_type __bkt_count) |
| 2599 | { |
| 2600 | __rehash_guard_t __rehash_guard(_M_rehash_policy); |
| 2601 | __bkt_count |
| 2602 | = std::max(_M_rehash_policy._M_bkt_for_elements(_M_element_count + 1), |
| 2603 | __bkt_count); |
| 2604 | __bkt_count = _M_rehash_policy._M_next_bkt(__bkt_count); |
| 2605 | |
| 2606 | if (__bkt_count != _M_bucket_count) |
| 2607 | { |
| 2608 | _M_rehash(__bkt_count, __unique_keys{}); |
| 2609 | __rehash_guard._M_guarded_obj = nullptr; |
| 2610 | } |
| 2611 | } |
| 2612 | |
| 2613 | // Rehash when there is no equivalent elements. |
| 2614 | template<typename _Key, typename _Value, typename _Alloc, |
| 2615 | typename _ExtractKey, typename _Equal, |
| 2616 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2617 | typename _RehashPolicy, typename _Traits> |
| 2618 | void |
| 2619 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2620 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2621 | _M_rehash(size_type __bkt_count, true_type /* __uks */) |
| 2622 | { |
| 2623 | __buckets_ptr __new_buckets = _M_allocate_buckets(__bkt_count); |
| 2624 | __node_ptr __p = _M_begin(); |
| 2625 | _M_before_begin._M_nxt = nullptr; |
| 2626 | std::size_t __bbegin_bkt = 0; |
| 2627 | while (__p) |
| 2628 | { |
| 2629 | __node_ptr __next = __p->_M_next(); |
| 2630 | std::size_t __bkt |
| 2631 | = __hash_code_base::_M_bucket_index(*__p, __bkt_count); |
| 2632 | if (!__new_buckets[__bkt]) |
| 2633 | { |
| 2634 | __p->_M_nxt = _M_before_begin._M_nxt; |
| 2635 | _M_before_begin._M_nxt = __p; |
| 2636 | __new_buckets[__bkt] = &_M_before_begin; |
| 2637 | if (__p->_M_nxt) |
| 2638 | __new_buckets[__bbegin_bkt] = __p; |
| 2639 | __bbegin_bkt = __bkt; |
| 2640 | } |
| 2641 | else |
| 2642 | { |
| 2643 | __p->_M_nxt = __new_buckets[__bkt]->_M_nxt; |
| 2644 | __new_buckets[__bkt]->_M_nxt = __p; |
| 2645 | } |
| 2646 | |
| 2647 | __p = __next; |
| 2648 | } |
| 2649 | |
| 2650 | _M_deallocate_buckets(); |
| 2651 | _M_bucket_count = __bkt_count; |
| 2652 | _M_buckets = __new_buckets; |
| 2653 | } |
| 2654 | |
| 2655 | // Rehash when there can be equivalent elements, preserve their relative |
| 2656 | // order. |
| 2657 | template<typename _Key, typename _Value, typename _Alloc, |
| 2658 | typename _ExtractKey, typename _Equal, |
| 2659 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2660 | typename _RehashPolicy, typename _Traits> |
| 2661 | void |
| 2662 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2663 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2664 | _M_rehash(size_type __bkt_count, false_type /* __uks */) |
| 2665 | { |
| 2666 | __buckets_ptr __new_buckets = _M_allocate_buckets(__bkt_count); |
| 2667 | __node_ptr __p = _M_begin(); |
| 2668 | _M_before_begin._M_nxt = nullptr; |
| 2669 | std::size_t __bbegin_bkt = 0; |
| 2670 | std::size_t __prev_bkt = 0; |
| 2671 | __node_ptr __prev_p = nullptr; |
| 2672 | bool __check_bucket = false; |
| 2673 | |
| 2674 | while (__p) |
| 2675 | { |
| 2676 | __node_ptr __next = __p->_M_next(); |
| 2677 | std::size_t __bkt |
| 2678 | = __hash_code_base::_M_bucket_index(*__p, __bkt_count); |
| 2679 | |
| 2680 | if (__prev_p && __prev_bkt == __bkt) |
| 2681 | { |
| 2682 | // Previous insert was already in this bucket, we insert after |
| 2683 | // the previously inserted one to preserve equivalent elements |
| 2684 | // relative order. |
| 2685 | __p->_M_nxt = __prev_p->_M_nxt; |
| 2686 | __prev_p->_M_nxt = __p; |
| 2687 | |
| 2688 | // Inserting after a node in a bucket require to check that we |
| 2689 | // haven't change the bucket last node, in this case next |
| 2690 | // bucket containing its before begin node must be updated. We |
| 2691 | // schedule a check as soon as we move out of the sequence of |
| 2692 | // equivalent nodes to limit the number of checks. |
| 2693 | __check_bucket = true; |
| 2694 | } |
| 2695 | else |
| 2696 | { |
| 2697 | if (__check_bucket) |
| 2698 | { |
| 2699 | // Check if we shall update the next bucket because of |
| 2700 | // insertions into __prev_bkt bucket. |
| 2701 | if (__prev_p->_M_nxt) |
| 2702 | { |
| 2703 | std::size_t __next_bkt |
| 2704 | = __hash_code_base::_M_bucket_index( |
| 2705 | *__prev_p->_M_next(), __bkt_count); |
| 2706 | if (__next_bkt != __prev_bkt) |
| 2707 | __new_buckets[__next_bkt] = __prev_p; |
| 2708 | } |
| 2709 | __check_bucket = false; |
| 2710 | } |
| 2711 | |
| 2712 | if (!__new_buckets[__bkt]) |
| 2713 | { |
| 2714 | __p->_M_nxt = _M_before_begin._M_nxt; |
| 2715 | _M_before_begin._M_nxt = __p; |
| 2716 | __new_buckets[__bkt] = &_M_before_begin; |
| 2717 | if (__p->_M_nxt) |
| 2718 | __new_buckets[__bbegin_bkt] = __p; |
| 2719 | __bbegin_bkt = __bkt; |
| 2720 | } |
| 2721 | else |
| 2722 | { |
| 2723 | __p->_M_nxt = __new_buckets[__bkt]->_M_nxt; |
| 2724 | __new_buckets[__bkt]->_M_nxt = __p; |
| 2725 | } |
| 2726 | } |
| 2727 | __prev_p = __p; |
| 2728 | __prev_bkt = __bkt; |
| 2729 | __p = __next; |
| 2730 | } |
| 2731 | |
| 2732 | if (__check_bucket && __prev_p->_M_nxt) |
| 2733 | { |
| 2734 | std::size_t __next_bkt |
| 2735 | = __hash_code_base::_M_bucket_index(*__prev_p->_M_next(), |
| 2736 | __bkt_count); |
| 2737 | if (__next_bkt != __prev_bkt) |
| 2738 | __new_buckets[__next_bkt] = __prev_p; |
| 2739 | } |
| 2740 | |
| 2741 | _M_deallocate_buckets(); |
| 2742 | _M_bucket_count = __bkt_count; |
| 2743 | _M_buckets = __new_buckets; |
| 2744 | } |
| 2745 | |
| 2746 | #if __cplusplus > 201402L |
| 2747 | template<typename, typename, typename> class _Hash_merge_helper { }; |
| 2748 | #endif // C++17 |
| 2749 | |
| 2750 | #if __cpp_deduction_guides >= 201606 |
| 2751 | // Used to constrain deduction guides |
| 2752 | template<typename _Hash> |
| 2753 | using _RequireNotAllocatorOrIntegral |
| 2754 | = __enable_if_t<!__or_<is_integral<_Hash>, __is_allocator<_Hash>>::value>; |
| 2755 | #endif |
| 2756 | |
| 2757 | /// @endcond |
| 2758 | _GLIBCXX_END_NAMESPACE_VERSION |
| 2759 | } // namespace std |
| 2760 | |
| 2761 | #endif // _HASHTABLE_H |
| 2762 |
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