libcxx/include/__algorithm/iter_swap.h

   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___ALGORITHM_ITER_SWAP_H
  10 #define _LIBCPP___ALGORITHM_ITER_SWAP_H
  11
  12 #include <__config>
  13 #include <__utility/declval.h>
  14 #include <__utility/swap.h>
  15
  16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  17 #  pragma GCC system_header
  18 #endif
  19
  20 _LIBCPP_BEGIN_NAMESPACE_STD
  21
  22 template <class _ForwardIterator1, class _ForwardIterator2>
  23 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 void iter_swap(_ForwardIterator1 __a,
  24                                                                               _ForwardIterator2 __b)
  25     //                                  _NOEXCEPT_(_NOEXCEPT_(swap(*__a, *__b)))
  26     _NOEXCEPT_(_NOEXCEPT_(swap(*std::declval<_ForwardIterator1>(), *std::declval<_ForwardIterator2>()))) {
  27   swap(*__a, *__b);
  28 }
  29
  30 _LIBCPP_END_NAMESPACE_STD
  31
  32 #endif // _LIBCPP___ALGORITHM_ITER_SWAP_H