source: Daodan/MSYS2/mingw32/include/c++/11.2.0/experimental/array@ 1171

Last change on this file since 1171 was 1166, checked in by rossy, 3 years ago

Daodan: Replace MinGW build env with an up-to-date MSYS2 env

File size: 3.3 KB
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[1166]1// <experimental/array> -*- C++ -*-
2
3// Copyright (C) 2015-2021 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 experimental/array
26 * This is a TS C++ Library header.
27 * @ingroup libfund-ts
28 */
29
30#ifndef _GLIBCXX_EXPERIMENTAL_ARRAY
31#define _GLIBCXX_EXPERIMENTAL_ARRAY 1
32
33#pragma GCC system_header
34
35#if __cplusplus >= 201402L
36
37#include <array>
38#include <experimental/type_traits>
39
40namespace std _GLIBCXX_VISIBILITY(default)
41{
42_GLIBCXX_BEGIN_NAMESPACE_VERSION
43
44namespace experimental
45{
46inline namespace fundamentals_v2
47{
48#define __cpp_lib_experimental_make_array 201505
49 /**
50 * @defgroup make_array Array creation functions
51 * @ingroup libfund-ts
52 *
53 * Array creation functions as described in N4529,
54 * Working Draft, C++ Extensions for Library Fundamentals, Version 2
55 *
56 * @{
57 */
58
59template<typename _Dest, typename... _Types>
60 struct __make_array_elem
61 {
62 using type = _Dest;
63 };
64
65template<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 {};
76
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 };
81
82/// Create a std::array from a variable-length list of arguments.
83template <typename _Dest = void, typename... _Types>
84 constexpr
85 array<typename __make_array_elem<_Dest, _Types...>::type, sizeof...(_Types)>
86 make_array(_Types&&... __t)
87 {
88 return {{ std::forward<_Types>(__t)... }};
89 }
90
91template <typename _Tp, size_t _Nm, size_t... _Idx>
92 constexpr array<remove_cv_t<_Tp>, _Nm>
93 __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>)
94 {
95 return {{__a[_Idx]...}};
96 }
97
98/// Create a std::array from an array.
99template <typename _Tp, size_t _Nm>
100 constexpr array<remove_cv_t<_Tp>, _Nm>
101 to_array(_Tp (&__a)[_Nm])
102 noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value)
103 {
104 return experimental::__to_array(__a, make_index_sequence<_Nm>{});
105 }
106
107 /// @} group make_array
108} // namespace fundamentals_v2
109} // namespace experimental
110
111_GLIBCXX_END_NAMESPACE_VERSION
112} // namespace std
113
114#endif // C++14
115
116#endif // _GLIBCXX_EXPERIMENTAL_ARRAY
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