__cxx03/__algorithm/ranges_swap_ranges.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___CXX03___ALGORITHM_RANGES_SWAP_RANGES_H
0010 #define _LIBCPP___CXX03___ALGORITHM_RANGES_SWAP_RANGES_H
0011
0012 #include <__cxx03/__algorithm/in_in_result.h>
0013 #include <__cxx03/__algorithm/iterator_operations.h>
0014 #include <__cxx03/__algorithm/swap_ranges.h>
0015 #include <__cxx03/__config>
0016 #include <__cxx03/__iterator/concepts.h>
0017 #include <__cxx03/__iterator/iter_swap.h>
0018 #include <__cxx03/__ranges/access.h>
0019 #include <__cxx03/__ranges/concepts.h>
0020 #include <__cxx03/__ranges/dangling.h>
0021 #include <__cxx03/__utility/move.h>
0022
0023 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0024 #  pragma GCC system_header
0025 #endif
0026
0027 _LIBCPP_PUSH_MACROS
0028 #include <__cxx03/__undef_macros>
0029
0030 #if _LIBCPP_STD_VER >= 20
0031
0032 _LIBCPP_BEGIN_NAMESPACE_STD
0033
0034 namespace ranges {
0035
0036 template <class _I1, class _I2>
0037 using swap_ranges_result = in_in_result<_I1, _I2>;
0038
0039 namespace __swap_ranges {
0040 struct __fn {
0041   template <input_iterator _I1, sentinel_for<_I1> _S1, input_iterator _I2, sentinel_for<_I2> _S2>
0042     requires indirectly_swappable<_I1, _I2>
0043   _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<_I1, _I2>
0044   operator()(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2) const {
0045     auto __ret = std::__swap_ranges<_RangeAlgPolicy>(
0046         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2));
0047     return {std::move(__ret.first), std::move(__ret.second)};
0048   }
0049
0050   template <input_range _R1, input_range _R2>
0051     requires indirectly_swappable<iterator_t<_R1>, iterator_t<_R2>>
0052   _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>>
0053   operator()(_R1&& __r1, _R2&& __r2) const {
0054     return operator()(ranges::begin(__r1), ranges::end(__r1), ranges::begin(__r2), ranges::end(__r2));
0055   }
0056 };
0057 } // namespace __swap_ranges
0058
0059 inline namespace __cpo {
0060 inline constexpr auto swap_ranges = __swap_ranges::__fn{};
0061 } // namespace __cpo
0062 } // namespace ranges
0063
0064 _LIBCPP_END_NAMESPACE_STD
0065
0066 #endif // _LIBCPP_STD_VER >= 20
0067
0068 _LIBCPP_POP_MACROS
0069
0070 #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_SWAP_RANGES_H