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/reverse_view.h>
22#include <__ranges/subrange.h>
23#include <__utility/move.h>
24
25#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
26# pragma GCC system_header
27#endif
28
29_LIBCPP_PUSH_MACROS
30#include <__undef_macros>
31
32#if _LIBCPP_STD_VER >= 20
33
34_LIBCPP_BEGIN_NAMESPACE_STD
35
36namespace ranges {
37
38template <class _InIter, class _OutIter>
39using reverse_copy_result = in_out_result<_InIter, _OutIter>;
40
41struct __reverse_copy {
42 template <bidirectional_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter>
43 requires indirectly_copyable<_InIter, _OutIter>
44 _LIBCPP_HIDE_FROM_ABI constexpr reverse_copy_result<_InIter, _OutIter>
45 operator()(_InIter __first, _Sent __last, _OutIter __result) const {
46 return (*this)(subrange(std::move(__first), std::move(__last)), std::move(__result));
47 }
48
49 template <bidirectional_range _Range, weakly_incrementable _OutIter>
50 requires indirectly_copyable<iterator_t<_Range>, _OutIter>
51 _LIBCPP_HIDE_FROM_ABI constexpr reverse_copy_result<borrowed_iterator_t<_Range>, _OutIter>
52 operator()(_Range&& __range, _OutIter __result) const {
53 auto __ret = ranges::copy(__range | views::reverse, std::move(__result));
54 return {ranges::next(ranges::begin(__range), ranges::end(__range)), std::move(__ret.out)};
55 }
56};
57
58inline namespace __cpo {
59inline constexpr auto reverse_copy = __reverse_copy{};
60} // namespace __cpo
61} // namespace ranges
62
63_LIBCPP_END_NAMESPACE_STD
64
65#endif // _LIBCPP_STD_VER >= 20
66
67_LIBCPP_POP_MACROS
68
69#endif // _LIBCPP___ALGORITHM_RANGES_REVERSE_COPY_H
70