v1/__algorithm/iter_swap.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___ALGORITHM_ITER_SWAP_H
0010 #define _LIBCPP___ALGORITHM_ITER_SWAP_H
0011
0012 #include <__config>
0013 #include <__utility/declval.h>
0014 #include <__utility/swap.h>
0015
0016 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0017 #  pragma GCC system_header
0018 #endif
0019
0020 _LIBCPP_BEGIN_NAMESPACE_STD
0021
0022 template <class _ForwardIterator1, class _ForwardIterator2>
0023 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
0024     //                                  _NOEXCEPT_(_NOEXCEPT_(swap(*__a, *__b)))
0025     _NOEXCEPT_(_NOEXCEPT_(swap(*std::declval<_ForwardIterator1>(), *std::declval<_ForwardIterator2>()))) {
0026   swap(*__a, *__b);
0027 }
0028
0029 _LIBCPP_END_NAMESPACE_STD
0030
0031 #endif // _LIBCPP___ALGORITHM_ITER_SWAP_H