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 <__config> 14 #include <__iterator/concepts.h> 15 #include <__iterator/iter_swap.h> 16 #include <__ranges/access.h> 17 #include <__ranges/concepts.h> 18 #include <__ranges/dangling.h> 19 #include <__utility/move.h> 20 21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22 # pragma GCC system_header 23 # pragma clang include_instead(<algorithm>) 24 #endif 25 26 #ifndef _LIBCPP_HAS_NO_CONCEPTS 27 28 _LIBCPP_BEGIN_NAMESPACE_STD 29 30 namespace ranges { 31 32 template <class _I1, class _I2> 33 using swap_ranges_result = in_in_result<_I1, _I2>; 34 35 namespace __swap_ranges { 36 struct __fn { 37 template <input_iterator _I1, sentinel_for<_I1> _S1, 38 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 while (__first1 != __last1 && __first2 != __last2) { 43 ranges::iter_swap(__first1, __first2); 44 ++__first1; 45 ++__first2; 46 } 47 return {_VSTD::move(__first1), _VSTD::move(__first2)}; 48 } 49 50 template <input_range _R1, input_range _R2> 51 requires indirectly_swappable<iterator_t<_R1>, iterator_t<_R2>> 52 _LIBCPP_HIDE_FROM_ABI constexpr 53 swap_ranges_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>> 54 operator()(_R1&& __r1, _R2&& __r2) const { 55 return operator()(ranges::begin(__r1), ranges::end(__r1), 56 ranges::begin(__r2), ranges::end(__r2)); 57 } 58 }; 59 } // namespace __swap_ranges 60 61 inline namespace __cpo { 62 inline constexpr auto swap_ranges = __swap_ranges::__fn{}; 63 } // namespace __cpo 64 } // namespace ranges 65 66 _LIBCPP_END_NAMESPACE_STD 67 68 #endif // _LIBCPP_HAS_NO_RANGES 69 70 #endif // _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H 71