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