| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H |
| #define _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H |
| |
| #include <__algorithm/in_in_result.h> |
| #include <__config> |
| #include <__iterator/concepts.h> |
| #include <__iterator/iter_swap.h> |
| #include <__ranges/access.h> |
| #include <__ranges/concepts.h> |
| #include <__ranges/dangling.h> |
| #include <__utility/move.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| namespace ranges { |
| |
| template <class _I1, class _I2> |
| using swap_ranges_result = in_in_result<_I1, _I2>; |
| |
| namespace __swap_ranges { |
| struct __fn { |
| template <input_iterator _I1, sentinel_for<_I1> _S1, |
| input_iterator _I2, sentinel_for<_I2> _S2> |
| requires indirectly_swappable<_I1, _I2> |
| _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<_I1, _I2> |
| operator()(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2) const { |
| while (__first1 != __last1 && __first2 != __last2) { |
| ranges::iter_swap(__first1, __first2); |
| ++__first1; |
| ++__first2; |
| } |
| return {_VSTD::move(__first1), _VSTD::move(__first2)}; |
| } |
| |
| template <input_range _R1, input_range _R2> |
| requires indirectly_swappable<iterator_t<_R1>, iterator_t<_R2>> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| swap_ranges_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>> |
| operator()(_R1&& __r1, _R2&& __r2) const { |
| return operator()(ranges::begin(__r1), ranges::end(__r1), |
| ranges::begin(__r2), ranges::end(__r2)); |
| } |
| }; |
| } // namespace __swap_ranges |
| |
| inline namespace __cpo { |
| inline constexpr auto swap_ranges = __swap_ranges::__fn{}; |
| } // namespace __cpo |
| } // namespace ranges |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) |
| |
| #endif // _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H |