61 lines · c
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___UTILITY_SWAP_H10#define _LIBCPP___UTILITY_SWAP_H11 12#include <__config>13#include <__cstddef/size_t.h>14#include <__type_traits/enable_if.h>15#include <__type_traits/is_assignable.h>16#include <__type_traits/is_constructible.h>17#include <__type_traits/is_nothrow_assignable.h>18#include <__type_traits/is_nothrow_constructible.h>19#include <__type_traits/is_swappable.h>20#include <__utility/move.h>21 22#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)23# pragma GCC system_header24#endif25 26_LIBCPP_PUSH_MACROS27#include <__undef_macros>28 29_LIBCPP_BEGIN_NAMESPACE_STD30 31#ifndef _LIBCPP_CXX03_LANG32template <class _Tp>33using __swap_result_t _LIBCPP_NODEBUG =34 __enable_if_t<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>;35#else36template <class>37using __swap_result_t _LIBCPP_NODEBUG = void;38#endif39 40template <class _Tp>41inline _LIBCPP_HIDE_FROM_ABI __swap_result_t<_Tp> _LIBCPP_CONSTEXPR_SINCE_CXX20 swap(_Tp& __x, _Tp& __y)42 _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value&& is_nothrow_move_assignable<_Tp>::value) {43 _Tp __t(std::move(__x));44 __x = std::move(__y);45 __y = std::move(__t);46}47 48template <class _Tp, size_t _Np, __enable_if_t<__is_swappable_v<_Tp>, int> >49inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np])50 _NOEXCEPT_(__is_nothrow_swappable_v<_Tp>) {51 for (size_t __i = 0; __i != _Np; ++__i) {52 swap(__a[__i], __b[__i]);53 }54}55 56_LIBCPP_END_NAMESPACE_STD57 58_LIBCPP_POP_MACROS59 60#endif // _LIBCPP___UTILITY_SWAP_H61