1 // <experimental/array> -*- C++ -*-
3 // Copyright (C) 2015-2024 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25 /** @file experimental/array
26 * This is a TS C++ Library header.
30 #ifndef _GLIBCXX_EXPERIMENTAL_ARRAY
31 #define _GLIBCXX_EXPERIMENTAL_ARRAY 1
33 #pragma GCC system_header
35 #include <bits/requires_hosted.h> // experimental is currently omitted
37 #if __cplusplus >= 201402L
40 #include <experimental/type_traits>
42 namespace std _GLIBCXX_VISIBILITY(default)
44 _GLIBCXX_BEGIN_NAMESPACE_VERSION
46 namespace experimental
48 inline namespace fundamentals_v2
50 #define __cpp_lib_experimental_make_array 201505
52 * @defgroup make_array Array creation functions
55 * Array creation functions as described in N4529,
56 * Working Draft, C++ Extensions for Library Fundamentals, Version 2
61 template<typename _Dest, typename... _Types>
62 struct __make_array_elem
67 template<typename... _Types>
68 struct __make_array_elem<void, _Types...>
69 : common_type<_Types...>
72 struct __is_reference_wrapper : false_type
75 template <typename _Up>
76 struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type
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");
84 /// Create a std::array from a variable-length list of arguments.
85 template <typename _Dest = void, typename... _Types>
87 array<typename __make_array_elem<_Dest, _Types...>::type, sizeof...(_Types)>
88 make_array(_Types&&... __t)
90 return {{ std::forward<_Types>(__t)... }};
93 template <typename _Tp, size_t _Nm, size_t... _Idx>
94 constexpr array<remove_cv_t<_Tp>, _Nm>
95 __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>)
97 return {{__a[_Idx]...}};
100 /// Create a std::array from an array.
101 template <typename _Tp, size_t _Nm>
102 constexpr array<remove_cv_t<_Tp>, _Nm>
103 to_array(_Tp (&__a)[_Nm])
104 noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value)
106 return experimental::__to_array(__a, make_index_sequence<_Nm>{});
109 /// @} group make_array
110 } // namespace fundamentals_v2
111 } // namespace experimental
113 _GLIBCXX_END_NAMESPACE_VERSION
118 #endif // _GLIBCXX_EXPERIMENTAL_ARRAY