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_COPY_BACKWARD_H 10 #define _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H 11 12 #include <__algorithm/copy_backward.h> 13 #include <__algorithm/in_out_result.h> 14 #include <__algorithm/iterator_operations.h> 15 #include <__config> 16 #include <__iterator/concepts.h> 17 #include <__ranges/access.h> 18 #include <__ranges/concepts.h> 19 #include <__ranges/dangling.h> 20 #include <__utility/move.h> 21 22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23 # pragma GCC system_header 24 #endif 25 26 #if _LIBCPP_STD_VER >= 20 27 28 _LIBCPP_BEGIN_NAMESPACE_STD 29 30 namespace ranges { 31 32 template <class _Ip, class _Op> 33 using copy_backward_result = in_out_result<_Ip, _Op>; 34 35 namespace __copy_backward { 36 struct __fn { 37 template <bidirectional_iterator _InIter1, sentinel_for<_InIter1> _Sent1, bidirectional_iterator _InIter2> 38 requires indirectly_copyable<_InIter1, _InIter2> 39 _LIBCPP_HIDE_FROM_ABI constexpr copy_backward_result<_InIter1, _InIter2> 40 operator()(_InIter1 __first, _Sent1 __last, _InIter2 __result) const { 41 auto __ret = std::__copy_backward<_RangeAlgPolicy>(std::move(__first), std::move(__last), std::move(__result)); 42 return {std::move(__ret.first), std::move(__ret.second)}; 43 } 44 45 template <bidirectional_range _Range, bidirectional_iterator _Iter> 46 requires indirectly_copyable<iterator_t<_Range>, _Iter> 47 _LIBCPP_HIDE_FROM_ABI constexpr copy_backward_result<borrowed_iterator_t<_Range>, _Iter> 48 operator()(_Range&& __r, _Iter __result) const { 49 auto __ret = std::__copy_backward<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), std::move(__result)); 50 return {std::move(__ret.first), std::move(__ret.second)}; 51 } 52 }; 53 } // namespace __copy_backward 54 55 inline namespace __cpo { 56 inline constexpr auto copy_backward = __copy_backward::__fn{}; 57 } // namespace __cpo 58 } // namespace ranges 59 60 _LIBCPP_END_NAMESPACE_STD 61 62 #endif // _LIBCPP_STD_VER >= 20 63 64 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H 65