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1 | // <experimental/array> -*- C++ -*- |
2 | ||
83ffe9cd | 3 | // Copyright (C) 2015-2023 Free Software Foundation, Inc. |
9638eccd VV |
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 experimental/array | |
26 | * This is a TS C++ Library header. | |
1ababc8b | 27 | * @ingroup libfund-ts |
9638eccd VV |
28 | */ |
29 | ||
30 | #ifndef _GLIBCXX_EXPERIMENTAL_ARRAY | |
31 | #define _GLIBCXX_EXPERIMENTAL_ARRAY 1 | |
32 | ||
33 | #pragma GCC system_header | |
34 | ||
18f176d0 AA |
35 | #include <bits/requires_hosted.h> // experimental is currently omitted |
36 | ||
d681026d | 37 | #if __cplusplus >= 201402L |
9638eccd VV |
38 | |
39 | #include <array> | |
9638eccd VV |
40 | #include <experimental/type_traits> |
41 | ||
42 | namespace std _GLIBCXX_VISIBILITY(default) | |
43 | { | |
4a15d842 FD |
44 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
45 | ||
9638eccd VV |
46 | namespace experimental |
47 | { | |
48 | inline namespace fundamentals_v2 | |
49 | { | |
357c9f7e | 50 | #define __cpp_lib_experimental_make_array 201505 |
9638eccd VV |
51 | /** |
52 | * @defgroup make_array Array creation functions | |
1ababc8b | 53 | * @ingroup libfund-ts |
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54 | * |
55 | * Array creation functions as described in N4529, | |
56 | * Working Draft, C++ Extensions for Library Fundamentals, Version 2 | |
57 | * | |
58 | * @{ | |
59 | */ | |
60 | ||
61ad58f3 JW |
61 | template<typename _Dest, typename... _Types> |
62 | struct __make_array_elem | |
63 | { | |
64 | using type = _Dest; | |
65 | }; | |
66 | ||
67 | template<typename... _Types> | |
68 | struct __make_array_elem<void, _Types...> | |
69 | : common_type<_Types...> | |
70 | { | |
71 | template <typename> | |
72 | struct __is_reference_wrapper : false_type | |
73 | {}; | |
74 | ||
75 | template <typename _Up> | |
76 | struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type | |
77 | {}; | |
9638eccd | 78 | |
61ad58f3 JW |
79 | static_assert(!__or_<__is_reference_wrapper<decay_t<_Types>>...>::value, |
80 | "make_array must be used with an explicit target type when" | |
81 | "any of the arguments is a reference_wrapper"); | |
82 | }; | |
9638eccd | 83 | |
1ababc8b | 84 | /// Create a std::array from a variable-length list of arguments. |
9638eccd | 85 | template <typename _Dest = void, typename... _Types> |
61ad58f3 JW |
86 | constexpr |
87 | array<typename __make_array_elem<_Dest, _Types...>::type, sizeof...(_Types)> | |
9638eccd | 88 | make_array(_Types&&... __t) |
9638eccd | 89 | { |
61ad58f3 | 90 | return {{ std::forward<_Types>(__t)... }}; |
9638eccd VV |
91 | } |
92 | ||
93 | template <typename _Tp, size_t _Nm, size_t... _Idx> | |
94 | constexpr array<remove_cv_t<_Tp>, _Nm> | |
61ad58f3 | 95 | __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>) |
9638eccd VV |
96 | { |
97 | return {{__a[_Idx]...}}; | |
98 | } | |
99 | ||
1ababc8b | 100 | /// Create a std::array from an array. |
9638eccd VV |
101 | template <typename _Tp, size_t _Nm> |
102 | constexpr array<remove_cv_t<_Tp>, _Nm> | |
103 | to_array(_Tp (&__a)[_Nm]) | |
61ad58f3 | 104 | noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value) |
9638eccd | 105 | { |
cb0de9b6 | 106 | return experimental::__to_array(__a, make_index_sequence<_Nm>{}); |
9638eccd VV |
107 | } |
108 | ||
f0b88346 | 109 | /// @} group make_array |
9638eccd VV |
110 | } // namespace fundamentals_v2 |
111 | } // namespace experimental | |
112 | ||
4a15d842 | 113 | _GLIBCXX_END_NAMESPACE_VERSION |
9638eccd VV |
114 | } // namespace std |
115 | ||
116 | #endif // C++14 | |
117 | ||
118 | #endif // _GLIBCXX_EXPERIMENTAL_ARRAY |