| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___UTILITY_SWAP_H |
| #define _LIBCPP___UTILITY_SWAP_H |
| |
| #include <__config> |
| #include <__type_traits/is_move_assignable.h> |
| #include <__type_traits/is_move_constructible.h> |
| #include <__type_traits/is_nothrow_move_assignable.h> |
| #include <__type_traits/is_nothrow_move_constructible.h> |
| #include <__type_traits/is_swappable.h> |
| #include <__utility/declval.h> |
| #include <__utility/move.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| template <class _Tp> |
| using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; |
| #else |
| template <class> |
| using __swap_result_t = void; |
| #endif |
| |
| template <class _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY __swap_result_t<_Tp> _LIBCPP_CONSTEXPR_SINCE_CXX20 swap(_Tp& __x, _Tp& __y) |
| _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value&& is_nothrow_move_assignable<_Tp>::value) { |
| _Tp __t(_VSTD::move(__x)); |
| __x = _VSTD::move(__y); |
| __y = _VSTD::move(__t); |
| } |
| |
| template <class _Tp, size_t _Np> |
| inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 typename enable_if<__is_swappable<_Tp>::value>::type |
| swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) { |
| for (size_t __i = 0; __i != _Np; ++__i) { |
| swap(__a[__i], __b[__i]); |
| } |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___UTILITY_SWAP_H |