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___UTILITY_SWAP_H
10#define _LIBCPP___UTILITY_SWAP_H
11
12#include <__config>
13#include <__type_traits/is_assignable.h>
14#include <__type_traits/is_constructible.h>
15#include <__type_traits/is_nothrow_assignable.h>
16#include <__type_traits/is_nothrow_constructible.h>
17#include <__type_traits/is_swappable.h>
18#include <__utility/declval.h>
19#include <__utility/move.h>
20#include <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 <__undef_macros>
28
29_LIBCPP_BEGIN_NAMESPACE_STD
30
31#ifndef _LIBCPP_CXX03_LANG
32template <class _Tp>
33using __swap_result_t = __enable_if_t<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>;
34#else
35template <class>
36using __swap_result_t = void;
37#endif
38
39template <class _Tp>
40inline _LIBCPP_HIDE_FROM_ABI __swap_result_t<_Tp> _LIBCPP_CONSTEXPR_SINCE_CXX20 swap(_Tp& __x, _Tp& __y)
41 _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value&& is_nothrow_move_assignable<_Tp>::value) {
42 _Tp __t(std::move(__x));
43 __x = std::move(__y);
44 __y = std::move(__t);
45}
46
47template <class _Tp, size_t _Np, __enable_if_t<__is_swappable_v<_Tp>, int> >
48inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np])
49 _NOEXCEPT_(__is_nothrow_swappable_v<_Tp>) {
50 for (size_t __i = 0; __i != _Np; ++__i) {
51 swap(__a[__i], __b[__i]);
52 }
53}
54
55_LIBCPP_END_NAMESPACE_STD
56
57_LIBCPP_POP_MACROS
58
59#endif // _LIBCPP___UTILITY_SWAP_H
60