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1 | // <experimental/array> -*- C++ -*- |
2 | ||
a5544970 | 3 | // Copyright (C) 2015-2019 Free Software Foundation, Inc. |
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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 |
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28 | */ |
29 | ||
30 | #ifndef _GLIBCXX_EXPERIMENTAL_ARRAY | |
31 | #define _GLIBCXX_EXPERIMENTAL_ARRAY 1 | |
32 | ||
33 | #pragma GCC system_header | |
34 | ||
d681026d | 35 | #if __cplusplus >= 201402L |
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36 | |
37 | #include <array> | |
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38 | #include <experimental/type_traits> |
39 | ||
40 | namespace std _GLIBCXX_VISIBILITY(default) | |
41 | { | |
4a15d842 FD |
42 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
43 | ||
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44 | namespace experimental |
45 | { | |
46 | inline namespace fundamentals_v2 | |
47 | { | |
357c9f7e | 48 | #define __cpp_lib_experimental_make_array 201505 |
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49 | /** |
50 | * @defgroup make_array Array creation functions | |
1ababc8b | 51 | * @ingroup libfund-ts |
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52 | * |
53 | * Array creation functions as described in N4529, | |
54 | * Working Draft, C++ Extensions for Library Fundamentals, Version 2 | |
55 | * | |
56 | * @{ | |
57 | */ | |
58 | ||
61ad58f3 JW |
59 | template<typename _Dest, typename... _Types> |
60 | struct __make_array_elem | |
61 | { | |
62 | using type = _Dest; | |
63 | }; | |
64 | ||
65 | template<typename... _Types> | |
66 | struct __make_array_elem<void, _Types...> | |
67 | : common_type<_Types...> | |
68 | { | |
69 | template <typename> | |
70 | struct __is_reference_wrapper : false_type | |
71 | {}; | |
72 | ||
73 | template <typename _Up> | |
74 | struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type | |
75 | {}; | |
9638eccd | 76 | |
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77 | static_assert(!__or_<__is_reference_wrapper<decay_t<_Types>>...>::value, |
78 | "make_array must be used with an explicit target type when" | |
79 | "any of the arguments is a reference_wrapper"); | |
80 | }; | |
9638eccd | 81 | |
1ababc8b | 82 | /// Create a std::array from a variable-length list of arguments. |
9638eccd | 83 | template <typename _Dest = void, typename... _Types> |
61ad58f3 JW |
84 | constexpr |
85 | array<typename __make_array_elem<_Dest, _Types...>::type, sizeof...(_Types)> | |
9638eccd | 86 | make_array(_Types&&... __t) |
9638eccd | 87 | { |
61ad58f3 | 88 | return {{ std::forward<_Types>(__t)... }}; |
9638eccd VV |
89 | } |
90 | ||
91 | template <typename _Tp, size_t _Nm, size_t... _Idx> | |
92 | constexpr array<remove_cv_t<_Tp>, _Nm> | |
61ad58f3 | 93 | __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>) |
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94 | { |
95 | return {{__a[_Idx]...}}; | |
96 | } | |
97 | ||
1ababc8b | 98 | /// Create a std::array from an array. |
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99 | template <typename _Tp, size_t _Nm> |
100 | constexpr array<remove_cv_t<_Tp>, _Nm> | |
101 | to_array(_Tp (&__a)[_Nm]) | |
61ad58f3 | 102 | noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value) |
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103 | { |
104 | return __to_array(__a, make_index_sequence<_Nm>{}); | |
105 | } | |
106 | ||
107 | // @} group make_array | |
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108 | } // namespace fundamentals_v2 |
109 | } // namespace experimental | |
110 | ||
4a15d842 | 111 | _GLIBCXX_END_NAMESPACE_VERSION |
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112 | } // namespace std |
113 | ||
114 | #endif // C++14 | |
115 | ||
116 | #endif // _GLIBCXX_EXPERIMENTAL_ARRAY |