libstdc++
experimental/array
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1// <experimental/array> -*- C++ -*-
2
3// Copyright (C) 2015-2016 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 */
28
29#ifndef _GLIBCXX_EXPERIMENTAL_ARRAY
30#define _GLIBCXX_EXPERIMENTAL_ARRAY 1
31
32#pragma GCC system_header
33
34#if __cplusplus <= 201103L
35# include <bits/c++14_warning.h>
36#else
37
38#include <array>
39#include <functional>
40#include <experimental/type_traits>
41
42namespace std _GLIBCXX_VISIBILITY(default)
43{
44namespace experimental
45{
46inline namespace fundamentals_v2
47{
48_GLIBCXX_BEGIN_NAMESPACE_VERSION
49
50#define __cpp_lib_experimental_make_array 201505
51 /**
52 * @defgroup make_array Array creation functions
53 * @ingroup experimental
54 *
55 * Array creation functions as described in N4529,
56 * Working Draft, C++ Extensions for Library Fundamentals, Version 2
57 *
58 * @{
59 */
60
61template <typename _Up>
62 struct __is_reference_wrapper : false_type
63 {};
64
65template <typename _Up>
66 struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type
67 {};
68
69template <typename _Dest = void, typename... _Types>
70 constexpr auto
71 make_array(_Types&&... __t)
72 -> array<typename conditional_t<is_void_v<_Dest>,
73 common_type<_Types...>,
74 common_type<_Dest>>::type,
75 sizeof...(_Types)>
76 {
77 static_assert(__or_<
78 __not_<is_void<_Dest>>,
79 __and_<__not_<__is_reference_wrapper<decay_t<_Types>>>...>>
80 ::value,
81 "make_array cannot be used without an explicit target type "
82 "if any of the types given is a reference_wrapper");
83 return {{ std::forward<_Types>(__t)... }};
84 }
85
86template <typename _Tp, size_t _Nm, size_t... _Idx>
87 constexpr array<remove_cv_t<_Tp>, _Nm>
88 __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>)
89 {
90 return {{__a[_Idx]...}};
91 }
92
93template <typename _Tp, size_t _Nm>
94 constexpr array<remove_cv_t<_Tp>, _Nm>
95 to_array(_Tp (&__a)[_Nm])
96 noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value)
97 {
98 return __to_array(__a, make_index_sequence<_Nm>{});
99 }
100
101 // @} group make_array
102 _GLIBCXX_END_NAMESPACE_VERSION
103} // namespace fundamentals_v2
104} // namespace experimental
105
106} // namespace std
107
108#endif // C++14
109
110#endif // _GLIBCXX_EXPERIMENTAL_ARRAY