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
111