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The C and C++ Include Header Files
/usr/include/c++/13/bits/move.h
$ cat -n /usr/include/c++/13/bits/move.h 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 __addressof(_Tp& __r) _GLIBCXX_NOEXCEPT 52 { 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 forward(typename std::remove_reference<_Tp>::type& __t) noexcept 71 { 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 move(_Tp&& __t) noexcept 98 { 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 addressof(_Tp& __r) noexcept 139 { 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 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 _Tp __tmp = _GLIBCXX_MOVE(__a); 198 __a = _GLIBCXX_MOVE(__b); 199 __b = _GLIBCXX_MOVE(__tmp); 200 } 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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