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4958a587 | 1 | // <experimental/array> -*- C++ -*- |
2 | ||
fbd26352 | 3 | // Copyright (C) 2015-2019 Free Software Foundation, Inc. |
4958a587 | 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. | |
27 | */ | |
28 | ||
29 | #ifndef _GLIBCXX_EXPERIMENTAL_ARRAY | |
30 | #define _GLIBCXX_EXPERIMENTAL_ARRAY 1 | |
31 | ||
32 | #pragma GCC system_header | |
33 | ||
a262f333 | 34 | #if __cplusplus >= 201402L |
4958a587 | 35 | |
36 | #include <array> | |
4958a587 | 37 | #include <experimental/type_traits> |
38 | ||
39 | namespace std _GLIBCXX_VISIBILITY(default) | |
40 | { | |
ae6a4ce9 | 41 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
42 | ||
4958a587 | 43 | namespace experimental |
44 | { | |
45 | inline namespace fundamentals_v2 | |
46 | { | |
5e453511 | 47 | #define __cpp_lib_experimental_make_array 201505 |
4958a587 | 48 | /** |
49 | * @defgroup make_array Array creation functions | |
50 | * @ingroup experimental | |
51 | * | |
52 | * Array creation functions as described in N4529, | |
53 | * Working Draft, C++ Extensions for Library Fundamentals, Version 2 | |
54 | * | |
55 | * @{ | |
56 | */ | |
57 | ||
ebac10c7 | 58 | template<typename _Dest, typename... _Types> |
59 | struct __make_array_elem | |
60 | { | |
61 | using type = _Dest; | |
62 | }; | |
63 | ||
64 | template<typename... _Types> | |
65 | struct __make_array_elem<void, _Types...> | |
66 | : common_type<_Types...> | |
67 | { | |
68 | template <typename> | |
69 | struct __is_reference_wrapper : false_type | |
70 | {}; | |
71 | ||
72 | template <typename _Up> | |
73 | struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type | |
74 | {}; | |
4958a587 | 75 | |
ebac10c7 | 76 | static_assert(!__or_<__is_reference_wrapper<decay_t<_Types>>...>::value, |
77 | "make_array must be used with an explicit target type when" | |
78 | "any of the arguments is a reference_wrapper"); | |
79 | }; | |
4958a587 | 80 | |
81 | template <typename _Dest = void, typename... _Types> | |
ebac10c7 | 82 | constexpr |
83 | array<typename __make_array_elem<_Dest, _Types...>::type, sizeof...(_Types)> | |
4958a587 | 84 | make_array(_Types&&... __t) |
4958a587 | 85 | { |
ebac10c7 | 86 | return {{ std::forward<_Types>(__t)... }}; |
4958a587 | 87 | } |
88 | ||
89 | template <typename _Tp, size_t _Nm, size_t... _Idx> | |
90 | constexpr array<remove_cv_t<_Tp>, _Nm> | |
ebac10c7 | 91 | __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>) |
4958a587 | 92 | { |
93 | return {{__a[_Idx]...}}; | |
94 | } | |
95 | ||
96 | template <typename _Tp, size_t _Nm> | |
97 | constexpr array<remove_cv_t<_Tp>, _Nm> | |
98 | to_array(_Tp (&__a)[_Nm]) | |
ebac10c7 | 99 | noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value) |
4958a587 | 100 | { |
101 | return __to_array(__a, make_index_sequence<_Nm>{}); | |
102 | } | |
103 | ||
104 | // @} group make_array | |
4958a587 | 105 | } // namespace fundamentals_v2 |
106 | } // namespace experimental | |
107 | ||
ae6a4ce9 | 108 | _GLIBCXX_END_NAMESPACE_VERSION |
4958a587 | 109 | } // namespace std |
110 | ||
111 | #endif // C++14 | |
112 | ||
113 | #endif // _GLIBCXX_EXPERIMENTAL_ARRAY |