1 // <utility> -*- C++ -*- 2 3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 4 // 2010, 2011 5 // Free Software Foundation, Inc. 6 // 7 // This file is part of the GNU ISO C++ Library. This library is free 8 // software; you can redistribute it and/or modify it under the 9 // terms of the GNU General Public License as published by the 10 // Free Software Foundation; either version 3, or (at your option) 11 // any later version. 12 13 // This library is distributed in the hope that it will be useful, 14 // but WITHOUT ANY WARRANTY; without even the implied warranty of 15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 // GNU General Public License for more details. 17 18 // Under Section 7 of GPL version 3, you are granted additional 19 // permissions described in the GCC Runtime Library Exception, version 20 // 3.1, as published by the Free Software Foundation. 21 22 // You should have received a copy of the GNU General Public License and 23 // a copy of the GCC Runtime Library Exception along with this program; 24 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 25 // <http://www.gnu.org/licenses/>. 26 27 /* 28 * 29 * Copyright (c) 1994 30 * Hewlett-Packard Company 31 * 32 * Permission to use, copy, modify, distribute and sell this software 33 * and its documentation for any purpose is hereby granted without fee, 34 * provided that the above copyright notice appear in all copies and 35 * that both that copyright notice and this permission notice appear 36 * in supporting documentation. Hewlett-Packard Company makes no 37 * representations about the suitability of this software for any 38 * purpose. It is provided "as is" without express or implied warranty. 39 * 40 * 41 * Copyright (c) 1996,1997 42 * Silicon Graphics Computer Systems, Inc. 43 * 44 * Permission to use, copy, modify, distribute and sell this software 45 * and its documentation for any purpose is hereby granted without fee, 46 * provided that the above copyright notice appear in all copies and 47 * that both that copyright notice and this permission notice appear 48 * in supporting documentation. Silicon Graphics makes no 49 * representations about the suitability of this software for any 50 * purpose. It is provided "as is" without express or implied warranty. 51 */ 52 53 /** @file include/utility 54 * This is a Standard C++ Library header. 55 */ 56 57 #ifndef _GLIBCXX_UTILITY 58 #define _GLIBCXX_UTILITY 1 59 60 #pragma GCC system_header 61 62 /** 63 * @defgroup utilities Utilities 64 * 65 * Components deemed generally useful. Includes pair, tuple, 66 * forward/move helpers, ratio, function object, metaprogramming and 67 * type traits, time, date, and memory functions. 68 */ 69 70 #include <bits/c++config.h> 71 #include <bits/stl_relops.h> 72 #include <bits/stl_pair.h> 73 74 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 75 #include <bits/move.h> 76 #include <initializer_list> 77 78 namespace std _GLIBCXX_VISIBILITY(default) 79 { 80 _GLIBCXX_BEGIN_NAMESPACE_VERSION 81 82 template<class _Tp> 83 class tuple_size; 84 85 template<std::size_t _Int, class _Tp> 86 class tuple_element; 87 88 // Various functions which give std::pair a tuple-like interface. 89 template<class _Tp1, class _Tp2> 90 struct tuple_size<std::pair<_Tp1, _Tp2>> 91 : public integral_constant<std::size_t, 2> { }; 92 93 template<class _Tp1, class _Tp2> 94 struct tuple_element<0, std::pair<_Tp1, _Tp2>> 95 { typedef _Tp1 type; }; 96 97 template<class _Tp1, class _Tp2> 98 struct tuple_element<1, std::pair<_Tp1, _Tp2>> 99 { typedef _Tp2 type; }; 100 101 template<std::size_t _Int> 102 struct __pair_get; 103 104 template<> 105 struct __pair_get<0> 106 { 107 template<typename _Tp1, typename _Tp2> 108 static constexpr _Tp1& 109 __get(std::pair<_Tp1, _Tp2>& __pair) noexcept 110 { return __pair.first; } 111 112 template<typename _Tp1, typename _Tp2> 113 static constexpr _Tp1&& 114 __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept 115 { return std::forward<_Tp1>(__pair.first); } 116 117 template<typename _Tp1, typename _Tp2> 118 static constexpr const _Tp1& 119 __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept 120 { return __pair.first; } 121 }; 122 123 template<> 124 struct __pair_get<1> 125 { 126 template<typename _Tp1, typename _Tp2> 127 static constexpr _Tp2& 128 __get(std::pair<_Tp1, _Tp2>& __pair) noexcept 129 { return __pair.second; } 130 131 template<typename _Tp1, typename _Tp2> 132 static constexpr _Tp2&& 133 __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept 134 { return std::forward<_Tp2>(__pair.second); } 135 136 template<typename _Tp1, typename _Tp2> 137 static constexpr const _Tp2& 138 __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept 139 { return __pair.second; } 140 }; 141 142 template<std::size_t _Int, class _Tp1, class _Tp2> 143 constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type& 144 get(std::pair<_Tp1, _Tp2>& __in) noexcept 145 { return __pair_get<_Int>::__get(__in); } 146 147 template<std::size_t _Int, class _Tp1, class _Tp2> 148 constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&& 149 get(std::pair<_Tp1, _Tp2>&& __in) noexcept 150 { return __pair_get<_Int>::__move_get(std::move(__in)); } 151 152 template<std::size_t _Int, class _Tp1, class _Tp2> 153 constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type& 154 get(const std::pair<_Tp1, _Tp2>& __in) noexcept 155 { return __pair_get<_Int>::__const_get(__in); } 156 157 _GLIBCXX_END_NAMESPACE_VERSION 158 } // namespace 159 160 #endif 161 162 #endif /* _GLIBCXX_UTILITY */ 163
