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 #if _LIBCPP_STD_VER >= 20 28 29 _LIBCPP_BEGIN_NAMESPACE_STD 30 31 namespace ranges { 32 33 template <class _I1, class _I2> 34 using swap_ranges_result = in_in_result<_I1, _I2>; 35 36 namespace __swap_ranges { 37 struct __fn { 38 template <input_iterator _I1, sentinel_for<_I1> _S1, input_iterator _I2, sentinel_for<_I2> _S2> 39 requires indirectly_swappable<_I1, _I2> 40 _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<_I1, _I2> 41 operator()(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2) const { 42 auto __ret = std::__swap_ranges<_RangeAlgPolicy>( 43 std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2)); 44 return {std::move(__ret.first), std::move(__ret.second)}; 45 } 46 47 template <input_range _R1, input_range _R2> 48 requires indirectly_swappable<iterator_t<_R1>, iterator_t<_R2>> 49 _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>> 50 operator()(_R1&& __r1, _R2&& __r2) const { 51 return operator()(ranges::begin(__r1), ranges::end(__r1), ranges::begin(__r2), ranges::end(__r2)); 52 } 53 }; 54 } // namespace __swap_ranges 55 56 inline namespace __cpo { 57 inline constexpr auto swap_ranges = __swap_ranges::__fn{}; 58 } // namespace __cpo 59 } // namespace ranges 60 61 _LIBCPP_END_NAMESPACE_STD 62 63 #endif // _LIBCPP_STD_VER >= 20 64 65 #endif // _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H 66