1 // <utility> -*- C++ -*- 2 3 // Copyright (C) 2001-2013 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 /* 26 * 27 * Copyright (c) 1994 28 * Hewlett-Packard Company 29 * 30 * Permission to use, copy, modify, distribute and sell this software 31 * and its documentation for any purpose is hereby granted without fee, 32 * provided that the above copyright notice appear in all copies and 33 * that both that copyright notice and this permission notice appear 34 * in supporting documentation. Hewlett-Packard Company makes no 35 * representations about the suitability of this software for any 36 * purpose. It is provided "as is" without express or implied warranty. 37 * 38 * 39 * Copyright (c) 1996,1997 40 * Silicon Graphics Computer Systems, Inc. 41 * 42 * Permission to use, copy, modify, distribute and sell this software 43 * and its documentation for any purpose is hereby granted without fee, 44 * provided that the above copyright notice appear in all copies and 45 * that both that copyright notice and this permission notice appear 46 * in supporting documentation. Silicon Graphics makes no 47 * representations about the suitability of this software for any 48 * purpose. It is provided "as is" without express or implied warranty. 49 */ 50 51 /** @file include/utility 52 * This is a Standard C++ Library header. 53 */ 54 55 #ifndef _GLIBCXX_UTILITY 56 #define _GLIBCXX_UTILITY 1 57 58 #pragma GCC system_header 59 60 /** 61 * @defgroup utilities Utilities 62 * 63 * Components deemed generally useful. Includes pair, tuple, 64 * forward/move helpers, ratio, function object, metaprogramming and 65 * type traits, time, date, and memory functions. 66 */ 67 68 #include <bits/c++config.h> 69 #include <bits/stl_relops.h> 70 #include <bits/stl_pair.h> 71 72 #if __cplusplus >= 201103L 73 #include <bits/move.h> 74 #include <initializer_list> 75 76 namespace std _GLIBCXX_VISIBILITY(default) 77 { 78 _GLIBCXX_BEGIN_NAMESPACE_VERSION 79 80 template<class _Tp> 81 class tuple_size; 82 83 template<std::size_t _Int, class _Tp> 84 class tuple_element; 85 86 // Various functions which give std::pair a tuple-like interface. 87 template<class _Tp1, class _Tp2> 88 struct tuple_size<std::pair<_Tp1, _Tp2>> 89 : public integral_constant<std::size_t, 2> { }; 90 91 template<class _Tp1, class _Tp2> 92 struct tuple_element<0, std::pair<_Tp1, _Tp2>> 93 { typedef _Tp1 type; }; 94 95 template<class _Tp1, class _Tp2> 96 struct tuple_element<1, std::pair<_Tp1, _Tp2>> 97 { typedef _Tp2 type; }; 98 99 template<std::size_t _Int> 100 struct __pair_get; 101 102 template<> 103 struct __pair_get<0> 104 { 105 template<typename _Tp1, typename _Tp2> 106 static constexpr _Tp1& 107 __get(std::pair<_Tp1, _Tp2>& __pair) noexcept 108 { return __pair.first; } 109 110 template<typename _Tp1, typename _Tp2> 111 static constexpr _Tp1&& 112 __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept 113 { return std::forward<_Tp1>(__pair.first); } 114 115 template<typename _Tp1, typename _Tp2> 116 static constexpr const _Tp1& 117 __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept 118 { return __pair.first; } 119 }; 120 121 template<> 122 struct __pair_get<1> 123 { 124 template<typename _Tp1, typename _Tp2> 125 static constexpr _Tp2& 126 __get(std::pair<_Tp1, _Tp2>& __pair) noexcept 127 { return __pair.second; } 128 129 template<typename _Tp1, typename _Tp2> 130 static constexpr _Tp2&& 131 __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept 132 { return std::forward<_Tp2>(__pair.second); } 133 134 template<typename _Tp1, typename _Tp2> 135 static constexpr const _Tp2& 136 __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept 137 { return __pair.second; } 138 }; 139 140 template<std::size_t _Int, class _Tp1, class _Tp2> 141 constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type& 142 get(std::pair<_Tp1, _Tp2>& __in) noexcept 143 { return __pair_get<_Int>::__get(__in); } 144 145 template<std::size_t _Int, class _Tp1, class _Tp2> 146 constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&& 147 get(std::pair<_Tp1, _Tp2>&& __in) noexcept 148 { return __pair_get<_Int>::__move_get(std::move(__in)); } 149 150 template<std::size_t _Int, class _Tp1, class _Tp2> 151 constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type& 152 get(const std::pair<_Tp1, _Tp2>& __in) noexcept 153 { return __pair_get<_Int>::__const_get(__in); } 154 155 _GLIBCXX_END_NAMESPACE_VERSION 156 } // namespace 157 158 #endif 159 160 #endif /* _GLIBCXX_UTILITY */ 161
