176d0caaeSpatrick //===----------------------------------------------------------------------===// 276d0caaeSpatrick // 376d0caaeSpatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 476d0caaeSpatrick // See https://llvm.org/LICENSE.txt for license information. 576d0caaeSpatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 676d0caaeSpatrick // 776d0caaeSpatrick //===----------------------------------------------------------------------===// 876d0caaeSpatrick 976d0caaeSpatrick #ifndef _LIBCPP___UTILITY_SWAP_H 1076d0caaeSpatrick #define _LIBCPP___UTILITY_SWAP_H 1176d0caaeSpatrick 1276d0caaeSpatrick #include <__config> 13*4bdff4beSrobert #include <__type_traits/is_move_assignable.h> 14*4bdff4beSrobert #include <__type_traits/is_move_constructible.h> 15*4bdff4beSrobert #include <__type_traits/is_nothrow_move_assignable.h> 16*4bdff4beSrobert #include <__type_traits/is_nothrow_move_constructible.h> 17*4bdff4beSrobert #include <__type_traits/is_swappable.h> 1876d0caaeSpatrick #include <__utility/declval.h> 1976d0caaeSpatrick #include <__utility/move.h> 2076d0caaeSpatrick #include <cstddef> 2176d0caaeSpatrick 2276d0caaeSpatrick #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2376d0caaeSpatrick # pragma GCC system_header 2476d0caaeSpatrick #endif 2576d0caaeSpatrick 2676d0caaeSpatrick _LIBCPP_BEGIN_NAMESPACE_STD 2776d0caaeSpatrick 2876d0caaeSpatrick #ifndef _LIBCPP_CXX03_LANG 2976d0caaeSpatrick template <class _Tp> 3076d0caaeSpatrick using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; 3176d0caaeSpatrick #else 3276d0caaeSpatrick template <class> 3376d0caaeSpatrick using __swap_result_t = void; 3476d0caaeSpatrick #endif 3576d0caaeSpatrick 3676d0caaeSpatrick template <class _Tp> swap(_Tp & __x,_Tp & __y)37*4bdff4beSrobertinline _LIBCPP_INLINE_VISIBILITY __swap_result_t<_Tp> _LIBCPP_CONSTEXPR_SINCE_CXX20 swap(_Tp& __x, _Tp& __y) 3876d0caaeSpatrick _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value&& is_nothrow_move_assignable<_Tp>::value) { 3976d0caaeSpatrick _Tp __t(_VSTD::move(__x)); 4076d0caaeSpatrick __x = _VSTD::move(__y); 4176d0caaeSpatrick __y = _VSTD::move(__t); 4276d0caaeSpatrick } 4376d0caaeSpatrick 4476d0caaeSpatrick template <class _Tp, size_t _Np> 45*4bdff4beSrobert inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 typename enable_if<__is_swappable<_Tp>::value>::type swap(_Tp (& __a)[_Np],_Tp (& __b)[_Np])4676d0caaeSpatrickswap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) { 4776d0caaeSpatrick for (size_t __i = 0; __i != _Np; ++__i) { 4876d0caaeSpatrick swap(__a[__i], __b[__i]); 4976d0caaeSpatrick } 5076d0caaeSpatrick } 5176d0caaeSpatrick 5276d0caaeSpatrick _LIBCPP_END_NAMESPACE_STD 5376d0caaeSpatrick 5476d0caaeSpatrick #endif // _LIBCPP___UTILITY_SWAP_H 55