| 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 <__utility/declval.h> |
| 14 | #include <__utility/move.h> |
| 15 | #include <cstddef> |
| 16 | #include <type_traits> |
| 17 | |
| 18 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 19 | # pragma GCC system_header |
| 20 | #endif |
| 21 | |
| 22 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 23 | |
| 24 | #ifndef _LIBCPP_CXX03_LANG |
| 25 | template <class _Tp> |
| 26 | using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; |
| 27 | #else |
| 28 | template <class> |
| 29 | using __swap_result_t = void; |
| 30 | #endif |
| 31 | |
| 32 | template <class _Tp> |
| 33 | inline _LIBCPP_INLINE_VISIBILITY __swap_result_t<_Tp> _LIBCPP_CONSTEXPR_AFTER_CXX17 swap(_Tp& __x, _Tp& __y) |
| 34 | _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value&& is_nothrow_move_assignable<_Tp>::value) { |
| 35 | _Tp __t(_VSTD::move(__x)); |
| 36 | __x = _VSTD::move(__y); |
| 37 | __y = _VSTD::move(__t); |
| 38 | } |
| 39 | |
| 40 | template <class _Tp, size_t _Np> |
| 41 | inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 typename enable_if<__is_swappable<_Tp>::value>::type |
| 42 | swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) { |
| 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 | #endif // _LIBCPP___UTILITY_SWAP_H |
| 51 |