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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___CXX03___UTILITY_SWAP_H 10 #define _LIBCPP___CXX03___UTILITY_SWAP_H 11 12 #include <__cxx03/__config> 13 #include <__cxx03/__type_traits/is_assignable.h> 14 #include <__cxx03/__type_traits/is_constructible.h> 15 #include <__cxx03/__type_traits/is_nothrow_assignable.h> 16 #include <__cxx03/__type_traits/is_nothrow_constructible.h> 17 #include <__cxx03/__type_traits/is_swappable.h> 18 #include <__cxx03/__utility/declval.h> 19 #include <__cxx03/__utility/move.h> 20 #include <__cxx03/cstddef> 21 22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23 # pragma GCC system_header 24 #endif 25 26 _LIBCPP_PUSH_MACROS 27 #include <__cxx03/__undef_macros> 28 29 _LIBCPP_BEGIN_NAMESPACE_STD 30 31 template <class> 32 using __swap_result_t = void; 33 34 template <class _Tp> swap(_Tp & __x,_Tp & __y)35inline _LIBCPP_HIDE_FROM_ABI __swap_result_t<_Tp> swap(_Tp& __x, _Tp& __y) { 36 _Tp __t(std::move(__x)); 37 __x = std::move(__y); 38 __y = std::move(__t); 39 } 40 41 template <class _Tp, size_t _Np, __enable_if_t<__is_swappable_v<_Tp>, int> > swap(_Tp (& __a)[_Np],_Tp (& __b)[_Np])42inline _LIBCPP_HIDE_FROM_ABI void swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) { 43 for (size_t __i = 0; __i != _Np; ++__i) { 44 swap(__a[__i], __b[__i]); 45 } 46 } 47 48 _LIBCPP_END_NAMESPACE_STD 49 50 _LIBCPP_POP_MACROS 51 52 #endif // _LIBCPP___CXX03___UTILITY_SWAP_H 53