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 _LIBCPP_PUSH_MACROS 27 #include <__undef_macros> 28 29 #if _LIBCPP_STD_VER >= 20 30 31 _LIBCPP_BEGIN_NAMESPACE_STD 32 33 namespace ranges { 34 35 template <class _Ip, class _Op> 36 using copy_backward_result = in_out_result<_Ip, _Op>; 37 38 struct __copy_backward { 39 template <bidirectional_iterator _InIter1, sentinel_for<_InIter1> _Sent1, bidirectional_iterator _InIter2> 40 requires indirectly_copyable<_InIter1, _InIter2> 41 _LIBCPP_HIDE_FROM_ABI constexpr copy_backward_result<_InIter1, _InIter2> 42 operator()(_InIter1 __first, _Sent1 __last, _InIter2 __result) const { 43 auto __ret = std::__copy_backward<_RangeAlgPolicy>(std::move(__first), std::move(__last), std::move(__result)); 44 return {std::move(__ret.first), std::move(__ret.second)}; 45 } 46 47 template <bidirectional_range _Range, bidirectional_iterator _Iter> 48 requires indirectly_copyable<iterator_t<_Range>, _Iter> 49 _LIBCPP_HIDE_FROM_ABI constexpr copy_backward_result<borrowed_iterator_t<_Range>, _Iter> 50 operator()(_Range&& __r, _Iter __result) const { 51 auto __ret = std::__copy_backward<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), std::move(__result)); 52 return {std::move(__ret.first), std::move(__ret.second)}; 53 } 54 }; 55 56 inline namespace __cpo { 57 inline constexpr auto copy_backward = __copy_backward{}; 58 } // namespace __cpo 59 } // namespace ranges 60 61 _LIBCPP_END_NAMESPACE_STD 62 63 #endif // _LIBCPP_STD_VER >= 20 64 65 _LIBCPP_POP_MACROS 66 67 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H 68