xref: /freebsd-src/contrib/llvm-project/libcxx/include/__algorithm/ranges_reverse_copy.h (revision b3edf4467982447620505a28fc82e38a414c07dc)
1753f127fSDimitry Andric //===----------------------------------------------------------------------===//
2753f127fSDimitry Andric //
3753f127fSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4753f127fSDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
5753f127fSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6753f127fSDimitry Andric //
7753f127fSDimitry Andric //===----------------------------------------------------------------------===//
8753f127fSDimitry Andric 
9753f127fSDimitry Andric #ifndef _LIBCPP___ALGORITHM_RANGES_REVERSE_COPY_H
10753f127fSDimitry Andric #define _LIBCPP___ALGORITHM_RANGES_REVERSE_COPY_H
11753f127fSDimitry Andric 
12753f127fSDimitry Andric #include <__algorithm/in_out_result.h>
13753f127fSDimitry Andric #include <__algorithm/ranges_copy.h>
14753f127fSDimitry Andric #include <__config>
15753f127fSDimitry Andric #include <__iterator/concepts.h>
16753f127fSDimitry Andric #include <__iterator/next.h>
17753f127fSDimitry Andric #include <__iterator/reverse_iterator.h>
18753f127fSDimitry Andric #include <__ranges/access.h>
19753f127fSDimitry Andric #include <__ranges/concepts.h>
20753f127fSDimitry Andric #include <__ranges/dangling.h>
21753f127fSDimitry Andric #include <__ranges/subrange.h>
22753f127fSDimitry Andric #include <__utility/move.h>
23753f127fSDimitry Andric 
24753f127fSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
25753f127fSDimitry Andric #  pragma GCC system_header
26753f127fSDimitry Andric #endif
27753f127fSDimitry Andric 
28*b3edf446SDimitry Andric _LIBCPP_PUSH_MACROS
29*b3edf446SDimitry Andric #include <__undef_macros>
30*b3edf446SDimitry Andric 
3106c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20
32753f127fSDimitry Andric 
33753f127fSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD
34753f127fSDimitry Andric 
35753f127fSDimitry Andric namespace ranges {
36753f127fSDimitry Andric 
37753f127fSDimitry Andric template <class _InIter, class _OutIter>
38753f127fSDimitry Andric using reverse_copy_result = in_out_result<_InIter, _OutIter>;
39753f127fSDimitry Andric 
40753f127fSDimitry Andric namespace __reverse_copy {
41753f127fSDimitry Andric struct __fn {
42753f127fSDimitry Andric   template <bidirectional_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter>
43753f127fSDimitry Andric     requires indirectly_copyable<_InIter, _OutIter>
4406c3fb27SDimitry Andric   _LIBCPP_HIDE_FROM_ABI constexpr reverse_copy_result<_InIter, _OutIter>
operator__fn4506c3fb27SDimitry Andric   operator()(_InIter __first, _Sent __last, _OutIter __result) const {
46753f127fSDimitry Andric     return (*this)(subrange(std::move(__first), std::move(__last)), std::move(__result));
47753f127fSDimitry Andric   }
48753f127fSDimitry Andric 
49753f127fSDimitry Andric   template <bidirectional_range _Range, weakly_incrementable _OutIter>
50753f127fSDimitry Andric     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
5106c3fb27SDimitry Andric   _LIBCPP_HIDE_FROM_ABI constexpr reverse_copy_result<borrowed_iterator_t<_Range>, _OutIter>
operator__fn5206c3fb27SDimitry Andric   operator()(_Range&& __range, _OutIter __result) const {
53753f127fSDimitry Andric     auto __ret = ranges::copy(std::__reverse_range(__range), std::move(__result));
54753f127fSDimitry Andric     return {ranges::next(ranges::begin(__range), ranges::end(__range)), std::move(__ret.out)};
55753f127fSDimitry Andric   }
56753f127fSDimitry Andric };
57753f127fSDimitry Andric } // namespace __reverse_copy
58753f127fSDimitry Andric 
59753f127fSDimitry Andric inline namespace __cpo {
60753f127fSDimitry Andric inline constexpr auto reverse_copy = __reverse_copy::__fn{};
61753f127fSDimitry Andric } // namespace __cpo
62753f127fSDimitry Andric } // namespace ranges
63753f127fSDimitry Andric 
64753f127fSDimitry Andric _LIBCPP_END_NAMESPACE_STD
65753f127fSDimitry Andric 
6606c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20
67753f127fSDimitry Andric 
68*b3edf446SDimitry Andric _LIBCPP_POP_MACROS
69*b3edf446SDimitry Andric 
70753f127fSDimitry Andric #endif // _LIBCPP___ALGORITHM_RANGES_REVERSE_COPY_H
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