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 #endif 24 25 #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 26 27 _LIBCPP_BEGIN_NAMESPACE_STD 28 29 namespace ranges { 30 31 template <class _I1, class _I2> 32 using swap_ranges_result = in_in_result<_I1, _I2>; 33 34 namespace __swap_ranges { 35 struct __fn { 36 template <input_iterator _I1, sentinel_for<_I1> _S1, 37 input_iterator _I2, sentinel_for<_I2> _S2> 38 requires indirectly_swappable<_I1, _I2> 39 _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<_I1, _I2> 40 operator()(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2) const { 41 while (__first1 != __last1 && __first2 != __last2) { 42 ranges::iter_swap(__first1, __first2); 43 ++__first1; 44 ++__first2; 45 } 46 return {_VSTD::move(__first1), _VSTD::move(__first2)}; 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 52 swap_ranges_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>> 53 operator()(_R1&& __r1, _R2&& __r2) const { 54 return operator()(ranges::begin(__r1), ranges::end(__r1), 55 ranges::begin(__r2), ranges::end(__r2)); 56 } 57 }; 58 } // namespace __swap_ranges 59 60 inline namespace __cpo { 61 inline constexpr auto swap_ranges = __swap_ranges::__fn{}; 62 } // namespace __cpo 63 } // namespace ranges 64 65 _LIBCPP_END_NAMESPACE_STD 66 67 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 68 69 #endif // _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H 70