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| 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> |
| 35 | inline _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> > |
| 42 | inline _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 |
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