libcxx/include/__algorithm/ranges_swap_ranges.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_RANGES_SWAP_RANGES_H
  10 #define _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H
  11
  12 #include <__algorithm/in_in_result.h>
  13 #include <__algorithm/iterator_operations.h>
  14 #include <__algorithm/swap_ranges.h>
  15 #include <__config>
  16 #include <__iterator/concepts.h>
  17 #include <__iterator/iter_swap.h>
  18 #include <__ranges/access.h>
  19 #include <__ranges/concepts.h>
  20 #include <__ranges/dangling.h>
  21 #include <__utility/move.h>
  22
  23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  24 #  pragma GCC system_header
  25 #endif
  26
  27 _LIBCPP_PUSH_MACROS
  28 #include <__undef_macros>
  29
  30 #if _LIBCPP_STD_VER >= 20
  31
  32 _LIBCPP_BEGIN_NAMESPACE_STD
  33
  34 namespace ranges {
  35
  36 template <class _I1, class _I2>
  37 using swap_ranges_result = in_in_result<_I1, _I2>;
  38
  39 struct __swap_ranges {
  40   template <input_iterator _I1, sentinel_for<_I1> _S1, input_iterator _I2, sentinel_for<_I2> _S2>
  41     requires indirectly_swappable<_I1, _I2>
  42   _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<_I1, _I2>
  43   operator()(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2) const {
  44     auto __ret = std::__swap_ranges<_RangeAlgPolicy>(
  45         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2));
  46     return {std::move(__ret.first), std::move(__ret.second)};
  47   }
  48
  49   template <input_range _R1, input_range _R2>
  50     requires indirectly_swappable<iterator_t<_R1>, iterator_t<_R2>>
  51   _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>>
  52   operator()(_R1&& __r1, _R2&& __r2) const {
  53     return operator()(ranges::begin(__r1), ranges::end(__r1), ranges::begin(__r2), ranges::end(__r2));
  54   }
  55 };
  56
  57 inline namespace __cpo {
  58 inline constexpr auto swap_ranges = __swap_ranges{};
  59 } // namespace __cpo
  60 } // namespace ranges
  61
  62 _LIBCPP_END_NAMESPACE_STD
  63
  64 #endif // _LIBCPP_STD_VER >= 20
  65
  66 _LIBCPP_POP_MACROS
  67
  68 #endif // _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H