libstdc++
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00001 // <utility> -*- C++ -*- 00002 00003 // Copyright (C) 2001-2015 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /* 00026 * 00027 * Copyright (c) 1994 00028 * Hewlett-Packard Company 00029 * 00030 * Permission to use, copy, modify, distribute and sell this software 00031 * and its documentation for any purpose is hereby granted without fee, 00032 * provided that the above copyright notice appear in all copies and 00033 * that both that copyright notice and this permission notice appear 00034 * in supporting documentation. Hewlett-Packard Company makes no 00035 * representations about the suitability of this software for any 00036 * purpose. It is provided "as is" without express or implied warranty. 00037 * 00038 * 00039 * Copyright (c) 1996,1997 00040 * Silicon Graphics Computer Systems, Inc. 00041 * 00042 * Permission to use, copy, modify, distribute and sell this software 00043 * and its documentation for any purpose is hereby granted without fee, 00044 * provided that the above copyright notice appear in all copies and 00045 * that both that copyright notice and this permission notice appear 00046 * in supporting documentation. Silicon Graphics makes no 00047 * representations about the suitability of this software for any 00048 * purpose. It is provided "as is" without express or implied warranty. 00049 */ 00050 00051 /** @file include/utility 00052 * This is a Standard C++ Library header. 00053 */ 00054 00055 #ifndef _GLIBCXX_UTILITY 00056 #define _GLIBCXX_UTILITY 1 00057 00058 #pragma GCC system_header 00059 00060 /** 00061 * @defgroup utilities Utilities 00062 * 00063 * Components deemed generally useful. Includes pair, tuple, 00064 * forward/move helpers, ratio, function object, metaprogramming and 00065 * type traits, time, date, and memory functions. 00066 */ 00067 00068 #include <bits/c++config.h> 00069 #include <bits/stl_relops.h> 00070 #include <bits/stl_pair.h> 00071 00072 #if __cplusplus >= 201103L 00073 00074 #include <bits/move.h> 00075 #include <initializer_list> 00076 00077 namespace std _GLIBCXX_VISIBILITY(default) 00078 { 00079 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00080 00081 template<class _Tp> 00082 class tuple_size; 00083 00084 template<std::size_t _Int, class _Tp> 00085 class tuple_element; 00086 00087 // Various functions which give std::pair a tuple-like interface. 00088 00089 /// Partial specialization for std::pair 00090 template<class _Tp1, class _Tp2> 00091 struct tuple_size<std::pair<_Tp1, _Tp2>> 00092 : public integral_constant<std::size_t, 2> { }; 00093 00094 /// Partial specialization for std::pair 00095 template<class _Tp1, class _Tp2> 00096 struct tuple_element<0, std::pair<_Tp1, _Tp2>> 00097 { typedef _Tp1 type; }; 00098 00099 /// Partial specialization for std::pair 00100 template<class _Tp1, class _Tp2> 00101 struct tuple_element<1, std::pair<_Tp1, _Tp2>> 00102 { typedef _Tp2 type; }; 00103 00104 template<std::size_t _Int> 00105 struct __pair_get; 00106 00107 template<> 00108 struct __pair_get<0> 00109 { 00110 template<typename _Tp1, typename _Tp2> 00111 static constexpr _Tp1& 00112 __get(std::pair<_Tp1, _Tp2>& __pair) noexcept 00113 { return __pair.first; } 00114 00115 template<typename _Tp1, typename _Tp2> 00116 static constexpr _Tp1&& 00117 __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept 00118 { return std::forward<_Tp1>(__pair.first); } 00119 00120 template<typename _Tp1, typename _Tp2> 00121 static constexpr const _Tp1& 00122 __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept 00123 { return __pair.first; } 00124 }; 00125 00126 template<> 00127 struct __pair_get<1> 00128 { 00129 template<typename _Tp1, typename _Tp2> 00130 static constexpr _Tp2& 00131 __get(std::pair<_Tp1, _Tp2>& __pair) noexcept 00132 { return __pair.second; } 00133 00134 template<typename _Tp1, typename _Tp2> 00135 static constexpr _Tp2&& 00136 __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept 00137 { return std::forward<_Tp2>(__pair.second); } 00138 00139 template<typename _Tp1, typename _Tp2> 00140 static constexpr const _Tp2& 00141 __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept 00142 { return __pair.second; } 00143 }; 00144 00145 template<std::size_t _Int, class _Tp1, class _Tp2> 00146 constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type& 00147 get(std::pair<_Tp1, _Tp2>& __in) noexcept 00148 { return __pair_get<_Int>::__get(__in); } 00149 00150 template<std::size_t _Int, class _Tp1, class _Tp2> 00151 constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&& 00152 get(std::pair<_Tp1, _Tp2>&& __in) noexcept 00153 { return __pair_get<_Int>::__move_get(std::move(__in)); } 00154 00155 template<std::size_t _Int, class _Tp1, class _Tp2> 00156 constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type& 00157 get(const std::pair<_Tp1, _Tp2>& __in) noexcept 00158 { return __pair_get<_Int>::__const_get(__in); } 00159 00160 #if __cplusplus > 201103L 00161 00162 #define __cpp_lib_tuples_by_type 201304 00163 00164 template <typename _Tp, typename _Up> 00165 constexpr _Tp& 00166 get(pair<_Tp, _Up>& __p) noexcept 00167 { return __p.first; } 00168 00169 template <typename _Tp, typename _Up> 00170 constexpr const _Tp& 00171 get(const pair<_Tp, _Up>& __p) noexcept 00172 { return __p.first; } 00173 00174 template <typename _Tp, typename _Up> 00175 constexpr _Tp&& 00176 get(pair<_Tp, _Up>&& __p) noexcept 00177 { return std::move(__p.first); } 00178 00179 template <typename _Tp, typename _Up> 00180 constexpr _Tp& 00181 get(pair<_Up, _Tp>& __p) noexcept 00182 { return __p.second; } 00183 00184 template <typename _Tp, typename _Up> 00185 constexpr const _Tp& 00186 get(const pair<_Up, _Tp>& __p) noexcept 00187 { return __p.second; } 00188 00189 template <typename _Tp, typename _Up> 00190 constexpr _Tp&& 00191 get(pair<_Up, _Tp>&& __p) noexcept 00192 { return std::move(__p.second); } 00193 00194 #define __cpp_lib_exchange_function 201304 00195 00196 /// Assign @p __new_val to @p __obj and return its previous value. 00197 template <typename _Tp, typename _Up = _Tp> 00198 inline _Tp 00199 exchange(_Tp& __obj, _Up&& __new_val) 00200 { return std::__exchange(__obj, std::forward<_Up>(__new_val)); } 00201 #endif 00202 00203 // Stores a tuple of indices. Used by tuple and pair, and by bind() to 00204 // extract the elements in a tuple. 00205 template<size_t... _Indexes> 00206 struct _Index_tuple 00207 { 00208 typedef _Index_tuple<_Indexes..., sizeof...(_Indexes)> __next; 00209 }; 00210 00211 // Builds an _Index_tuple<0, 1, 2, ..., _Num-1>. 00212 template<size_t _Num> 00213 struct _Build_index_tuple 00214 { 00215 typedef typename _Build_index_tuple<_Num - 1>::__type::__next __type; 00216 }; 00217 00218 template<> 00219 struct _Build_index_tuple<0> 00220 { 00221 typedef _Index_tuple<> __type; 00222 }; 00223 00224 #if __cplusplus > 201103L 00225 00226 #define __cpp_lib_integer_sequence 201304 00227 00228 /// Class template integer_sequence 00229 template<typename _Tp, _Tp... _Idx> 00230 struct integer_sequence 00231 { 00232 typedef _Tp value_type; 00233 static constexpr size_t size() { return sizeof...(_Idx); } 00234 }; 00235 00236 template<typename _Tp, _Tp _Num, 00237 typename _ISeq = typename _Build_index_tuple<_Num>::__type> 00238 struct _Make_integer_sequence; 00239 00240 template<typename _Tp, _Tp _Num, size_t... _Idx> 00241 struct _Make_integer_sequence<_Tp, _Num, _Index_tuple<_Idx...>> 00242 { 00243 static_assert( _Num >= 0, 00244 "Cannot make integer sequence of negative length" ); 00245 00246 typedef integer_sequence<_Tp, static_cast<_Tp>(_Idx)...> __type; 00247 }; 00248 00249 /// Alias template make_integer_sequence 00250 template<typename _Tp, _Tp _Num> 00251 using make_integer_sequence 00252 = typename _Make_integer_sequence<_Tp, _Num>::__type; 00253 00254 /// Alias template index_sequence 00255 template<size_t... _Idx> 00256 using index_sequence = integer_sequence<size_t, _Idx...>; 00257 00258 /// Alias template make_index_sequence 00259 template<size_t _Num> 00260 using make_index_sequence = make_integer_sequence<size_t, _Num>; 00261 00262 /// Alias template index_sequence_for 00263 template<typename... _Types> 00264 using index_sequence_for = make_index_sequence<sizeof...(_Types)>; 00265 #endif 00266 00267 _GLIBCXX_END_NAMESPACE_VERSION 00268 } // namespace 00269 00270 #endif 00271 00272 #endif /* _GLIBCXX_UTILITY */