1 | // __ _____ _____ _____ |
2 | // __| | __| | | | JSON for Modern C++ |
3 | // | | |__ | | | | | | version 3.11.3 |
4 | // |_____|_____|_____|_|___| https://github.com/nlohmann/json |
5 | // |
6 | // SPDX-FileCopyrightText: 2013-2023 Niels Lohmann <https://nlohmann.me> |
7 | // SPDX-License-Identifier: MIT |
8 | |
9 | #pragma once |
10 | |
11 | #include <cstring> // strlen |
12 | #include <string> // string |
13 | #include <utility> // forward |
14 | |
15 | #include <nlohmann/detail/meta/cpp_future.hpp> |
16 | #include <nlohmann/detail/meta/detected.hpp> |
17 | |
18 | NLOHMANN_JSON_NAMESPACE_BEGIN |
19 | namespace detail |
20 | { |
21 | |
22 | inline std::size_t concat_length() |
23 | { |
24 | return 0; |
25 | } |
26 | |
27 | template<typename... Args> |
28 | inline std::size_t concat_length(const char* cstr, const Args& ... rest); |
29 | |
30 | template<typename StringType, typename... Args> |
31 | inline std::size_t concat_length(const StringType& str, const Args& ... rest); |
32 | |
33 | template<typename... Args> |
34 | inline std::size_t concat_length(const char /*c*/, const Args& ... rest) |
35 | { |
36 | return 1 + concat_length(rest...); |
37 | } |
38 | |
39 | template<typename... Args> |
40 | inline std::size_t concat_length(const char* cstr, const Args& ... rest) |
41 | { |
42 | // cppcheck-suppress ignoredReturnValue |
43 | return ::strlen(s: cstr) + concat_length(rest...); |
44 | } |
45 | |
46 | template<typename StringType, typename... Args> |
47 | inline std::size_t concat_length(const StringType& str, const Args& ... rest) |
48 | { |
49 | return str.size() + concat_length(rest...); |
50 | } |
51 | |
52 | template<typename OutStringType> |
53 | inline void concat_into(OutStringType& /*out*/) |
54 | {} |
55 | |
56 | template<typename StringType, typename Arg> |
57 | using string_can_append = decltype(std::declval<StringType&>().append(std::declval < Arg && > ())); |
58 | |
59 | template<typename StringType, typename Arg> |
60 | using detect_string_can_append = is_detected<string_can_append, StringType, Arg>; |
61 | |
62 | template<typename StringType, typename Arg> |
63 | using string_can_append_op = decltype(std::declval<StringType&>() += std::declval < Arg && > ()); |
64 | |
65 | template<typename StringType, typename Arg> |
66 | using detect_string_can_append_op = is_detected<string_can_append_op, StringType, Arg>; |
67 | |
68 | template<typename StringType, typename Arg> |
69 | using string_can_append_iter = decltype(std::declval<StringType&>().append(std::declval<const Arg&>().begin(), std::declval<const Arg&>().end())); |
70 | |
71 | template<typename StringType, typename Arg> |
72 | using detect_string_can_append_iter = is_detected<string_can_append_iter, StringType, Arg>; |
73 | |
74 | template<typename StringType, typename Arg> |
75 | using string_can_append_data = decltype(std::declval<StringType&>().append(std::declval<const Arg&>().data(), std::declval<const Arg&>().size())); |
76 | |
77 | template<typename StringType, typename Arg> |
78 | using detect_string_can_append_data = is_detected<string_can_append_data, StringType, Arg>; |
79 | |
80 | template < typename OutStringType, typename Arg, typename... Args, |
81 | enable_if_t < !detect_string_can_append<OutStringType, Arg>::value |
82 | && detect_string_can_append_op<OutStringType, Arg>::value, int > = 0 > |
83 | inline void concat_into(OutStringType& out, Arg && arg, Args && ... rest); |
84 | |
85 | template < typename OutStringType, typename Arg, typename... Args, |
86 | enable_if_t < !detect_string_can_append<OutStringType, Arg>::value |
87 | && !detect_string_can_append_op<OutStringType, Arg>::value |
88 | && detect_string_can_append_iter<OutStringType, Arg>::value, int > = 0 > |
89 | inline void concat_into(OutStringType& out, const Arg& arg, Args && ... rest); |
90 | |
91 | template < typename OutStringType, typename Arg, typename... Args, |
92 | enable_if_t < !detect_string_can_append<OutStringType, Arg>::value |
93 | && !detect_string_can_append_op<OutStringType, Arg>::value |
94 | && !detect_string_can_append_iter<OutStringType, Arg>::value |
95 | && detect_string_can_append_data<OutStringType, Arg>::value, int > = 0 > |
96 | inline void concat_into(OutStringType& out, const Arg& arg, Args && ... rest); |
97 | |
98 | template<typename OutStringType, typename Arg, typename... Args, |
99 | enable_if_t<detect_string_can_append<OutStringType, Arg>::value, int> = 0> |
100 | inline void concat_into(OutStringType& out, Arg && arg, Args && ... rest) |
101 | { |
102 | out.append(std::forward<Arg>(arg)); |
103 | concat_into(out, std::forward<Args>(rest)...); |
104 | } |
105 | |
106 | template < typename OutStringType, typename Arg, typename... Args, |
107 | enable_if_t < !detect_string_can_append<OutStringType, Arg>::value |
108 | && detect_string_can_append_op<OutStringType, Arg>::value, int > > |
109 | inline void concat_into(OutStringType& out, Arg&& arg, Args&& ... rest) |
110 | { |
111 | out += std::forward<Arg>(arg); |
112 | concat_into(out, std::forward<Args>(rest)...); |
113 | } |
114 | |
115 | template < typename OutStringType, typename Arg, typename... Args, |
116 | enable_if_t < !detect_string_can_append<OutStringType, Arg>::value |
117 | && !detect_string_can_append_op<OutStringType, Arg>::value |
118 | && detect_string_can_append_iter<OutStringType, Arg>::value, int > > |
119 | inline void concat_into(OutStringType& out, const Arg& arg, Args&& ... rest) |
120 | { |
121 | out.append(arg.begin(), arg.end()); |
122 | concat_into(out, std::forward<Args>(rest)...); |
123 | } |
124 | |
125 | template < typename OutStringType, typename Arg, typename... Args, |
126 | enable_if_t < !detect_string_can_append<OutStringType, Arg>::value |
127 | && !detect_string_can_append_op<OutStringType, Arg>::value |
128 | && !detect_string_can_append_iter<OutStringType, Arg>::value |
129 | && detect_string_can_append_data<OutStringType, Arg>::value, int > > |
130 | inline void concat_into(OutStringType& out, const Arg& arg, Args&& ... rest) |
131 | { |
132 | out.append(arg.data(), arg.size()); |
133 | concat_into(out, std::forward<Args>(rest)...); |
134 | } |
135 | |
136 | template<typename OutStringType = std::string, typename... Args> |
137 | inline OutStringType concat(Args && ... args) |
138 | { |
139 | OutStringType str; |
140 | str.reserve(concat_length(args...)); |
141 | concat_into(str, std::forward<Args>(args)...); |
142 | return str; |
143 | } |
144 | |
145 | } // namespace detail |
146 | NLOHMANN_JSON_NAMESPACE_END |
147 | |