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_REVERSE_COPY_H 10 #define _LIBCPP___ALGORITHM_RANGES_REVERSE_COPY_H 11 12 #include <__algorithm/in_out_result.h> 13 #include <__algorithm/ranges_copy.h> 14 #include <__config> 15 #include <__iterator/concepts.h> 16 #include <__iterator/next.h> 17 #include <__iterator/reverse_iterator.h> 18 #include <__ranges/access.h> 19 #include <__ranges/concepts.h> 20 #include <__ranges/dangling.h> 21 #include <__ranges/subrange.h> 22 #include <__utility/move.h> 23 24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25 # pragma GCC system_header 26 #endif 27 28 #if _LIBCPP_STD_VER >= 20 29 30 _LIBCPP_BEGIN_NAMESPACE_STD 31 32 namespace ranges { 33 34 template <class _InIter, class _OutIter> 35 using reverse_copy_result = in_out_result<_InIter, _OutIter>; 36 37 namespace __reverse_copy { 38 struct __fn { 39 template <bidirectional_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter> 40 requires indirectly_copyable<_InIter, _OutIter> 41 _LIBCPP_HIDE_FROM_ABI constexpr reverse_copy_result<_InIter, _OutIter> 42 operator()(_InIter __first, _Sent __last, _OutIter __result) const { 43 return (*this)(subrange(std::move(__first), std::move(__last)), std::move(__result)); 44 } 45 46 template <bidirectional_range _Range, weakly_incrementable _OutIter> 47 requires indirectly_copyable<iterator_t<_Range>, _OutIter> 48 _LIBCPP_HIDE_FROM_ABI constexpr reverse_copy_result<borrowed_iterator_t<_Range>, _OutIter> 49 operator()(_Range&& __range, _OutIter __result) const { 50 auto __ret = ranges::copy(std::__reverse_range(__range), std::move(__result)); 51 return {ranges::next(ranges::begin(__range), ranges::end(__range)), std::move(__ret.out)}; 52 } 53 }; 54 } // namespace __reverse_copy 55 56 inline namespace __cpo { 57 inline constexpr auto reverse_copy = __reverse_copy::__fn{}; 58 } // namespace __cpo 59 } // namespace ranges 60 61 _LIBCPP_END_NAMESPACE_STD 62 63 #endif // _LIBCPP_STD_VER >= 20 64 65 #endif // _LIBCPP___ALGORITHM_RANGES_REVERSE_COPY_H 66