27 KiB
27 KiB
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Line data Source code 1 : // Move, forward and identity for C++11 + swap -*- C++ -*- 2 : 3 : // Copyright (C) 2007-2023 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 bits/move.h 26 : * This is an internal header file, included by other library headers. 27 : * Do not attempt to use it directly. @headername{utility} 28 : */ 29 : 30 : #ifndef _MOVE_H 31 : #define _MOVE_H 1 32 : 33 : #include <bits/c++config.h> 34 : #if __cplusplus < 201103L 35 : # include <bits/concept_check.h> 36 : #else 37 : # include <type_traits> // Brings in std::declval too. 38 : #endif 39 : 40 : namespace std _GLIBCXX_VISIBILITY(default) 41 : { 42 : _GLIBCXX_BEGIN_NAMESPACE_VERSION 43 : 44 : // Used, in C++03 mode too, by allocators, etc. 45 : /** 46 : * @brief Same as C++11 std::addressof 47 : * @ingroup utilities 48 : */ 49 : template<typename _Tp> 50 : inline _GLIBCXX_CONSTEXPR _Tp* 51 587049110 : __addressof(_Tp& __r) _GLIBCXX_NOEXCEPT 52 587049110 : { return __builtin_addressof(__r); } 53 : 54 : #if __cplusplus >= 201103L 55 : 56 : /** 57 : * @addtogroup utilities 58 : * @{ 59 : */ 60 : 61 : /** 62 : * @brief Forward an lvalue. 63 : * @return The parameter cast to the specified type. 64 : * 65 : * This function is used to implement "perfect forwarding". 66 : */ 67 : template<typename _Tp> 68 : _GLIBCXX_NODISCARD 69 : constexpr _Tp&& 70 1452065534 : forward(typename std::remove_reference<_Tp>::type& __t) noexcept 71 1452065534 : { return static_cast<_Tp&&>(__t); } 72 : 73 : /** 74 : * @brief Forward an rvalue. 75 : * @return The parameter cast to the specified type. 76 : * 77 : * This function is used to implement "perfect forwarding". 78 : */ 79 : template<typename _Tp> 80 : _GLIBCXX_NODISCARD 81 : constexpr _Tp&& 82 : forward(typename std::remove_reference<_Tp>::type&& __t) noexcept 83 : { 84 : static_assert(!std::is_lvalue_reference<_Tp>::value, 85 : "std::forward must not be used to convert an rvalue to an lvalue"); 86 : return static_cast<_Tp&&>(__t); 87 : } 88 : 89 : /** 90 : * @brief Convert a value to an rvalue. 91 : * @param __t A thing of arbitrary type. 92 : * @return The parameter cast to an rvalue-reference to allow moving it. 93 : */ 94 : template<typename _Tp> 95 : _GLIBCXX_NODISCARD 96 : constexpr typename std::remove_reference<_Tp>::type&& 97 1779966736 : move(_Tp&& __t) noexcept 98 1779966736 : { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); } 99 : 100 : 101 : template<typename _Tp> 102 : struct __move_if_noexcept_cond 103 : : public __and_<__not_<is_nothrow_move_constructible<_Tp>>, 104 : is_copy_constructible<_Tp>>::type { }; 105 : 106 : /** 107 : * @brief Conditionally convert a value to an rvalue. 108 : * @param __x A thing of arbitrary type. 109 : * @return The parameter, possibly cast to an rvalue-reference. 110 : * 111 : * Same as std::move unless the type's move constructor could throw and the 112 : * type is copyable, in which case an lvalue-reference is returned instead. 113 : */ 114 : template<typename _Tp> 115 : _GLIBCXX_NODISCARD 116 : constexpr 117 : __conditional_t<__move_if_noexcept_cond<_Tp>::value, const _Tp&, _Tp&&> 118 : move_if_noexcept(_Tp& __x) noexcept 119 : { return std::move(__x); } 120 : 121 : // declval, from type_traits. 122 : 123 : #if __cplusplus > 201402L 124 : // _GLIBCXX_RESOLVE_LIB_DEFECTS 125 : // 2296. std::addressof should be constexpr 126 : # define __cpp_lib_addressof_constexpr 201603L 127 : #endif 128 : /** 129 : * @brief Returns the actual address of the object or function 130 : * referenced by r, even in the presence of an overloaded 131 : * operator&. 132 : * @param __r Reference to an object or function. 133 : * @return The actual address. 134 : */ 135 : template<typename _Tp> 136 : _GLIBCXX_NODISCARD 137 : inline _GLIBCXX17_CONSTEXPR _Tp* 138 106071838 : addressof(_Tp& __r) noexcept 139 106071838 : { return std::__addressof(__r); } 140 : 141 : // _GLIBCXX_RESOLVE_LIB_DEFECTS 142 : // 2598. addressof works on temporaries 143 : template<typename _Tp> 144 : const _Tp* addressof(const _Tp&&) = delete; 145 : 146 : // C++11 version of std::exchange for internal use. 147 : template <typename _Tp, typename _Up = _Tp> 148 : _GLIBCXX20_CONSTEXPR 149 : inline _Tp 150 : __exchange(_Tp& __obj, _Up&& __new_val) 151 : { 152 : _Tp __old_val = std::move(__obj); 153 : __obj = std::forward<_Up>(__new_val); 154 : return __old_val; 155 : } 156 : 157 : /// @} group utilities 158 : 159 : #define _GLIBCXX_FWDREF(_Tp) _Tp&& 160 : #define _GLIBCXX_MOVE(__val) std::move(__val) 161 : #define _GLIBCXX_FORWARD(_Tp, __val) std::forward<_Tp>(__val) 162 : #else 163 : #define _GLIBCXX_FWDREF(_Tp) const _Tp& 164 : #define _GLIBCXX_MOVE(__val) (__val) 165 : #define _GLIBCXX_FORWARD(_Tp, __val) (__val) 166 : #endif 167 : 168 : /** 169 : * @addtogroup utilities 170 : * @{ 171 : */ 172 : 173 : /** 174 : * @brief Swaps two values. 175 : * @param __a A thing of arbitrary type. 176 : * @param __b Another thing of arbitrary type. 177 : * @return Nothing. 178 : */ 179 : template<typename _Tp> 180 : _GLIBCXX20_CONSTEXPR 181 : inline 182 : #if __cplusplus >= 201103L 183 : typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>, 184 : is_move_constructible<_Tp>, 185 : is_move_assignable<_Tp>>::value>::type 186 : #else 187 : void 188 : #endif 189 1567088 : swap(_Tp& __a, _Tp& __b) 190 : _GLIBCXX_NOEXCEPT_IF(__and_<is_nothrow_move_constructible<_Tp>, 191 : is_nothrow_move_assignable<_Tp>>::value) 192 : { 193 : #if __cplusplus < 201103L 194 : // concept requirements 195 : __glibcxx_function_requires(_SGIAssignableConcept<_Tp>) 196 : #endif 197 1567088 : _Tp __tmp = _GLIBCXX_MOVE(__a); 198 1567088 : __a = _GLIBCXX_MOVE(__b); 199 1567088 : __b = _GLIBCXX_MOVE(__tmp); 200 1567088 : } 201 : 202 : // _GLIBCXX_RESOLVE_LIB_DEFECTS 203 : // DR 809. std::swap should be overloaded for array types. 204 : /// Swap the contents of two arrays. 205 : template<typename _Tp, size_t _Nm> 206 : _GLIBCXX20_CONSTEXPR 207 : inline 208 : #if __cplusplus >= 201103L 209 : typename enable_if<__is_swappable<_Tp>::value>::type 210 : #else 211 : void 212 : #endif 213 : swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm]) 214 : _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Tp>::value) 215 : { 216 : for (size_t __n = 0; __n < _Nm; ++__n) 217 : swap(__a[__n], __b[__n]); 218 : } 219 : 220 : /// @} group utilities 221 : _GLIBCXX_END_NAMESPACE_VERSION 222 : } // namespace 223 : 224 : #endif /* _MOVE_H */ |
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| Generated by: LCOV version 2.0-1 |
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