xref: /freebsd-src/contrib/llvm-project/libcxx/include/__algorithm/ranges_rotate_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_ROTATE_COPY_H
10753f127fSDimitry Andric #define _LIBCPP___ALGORITHM_RANGES_ROTATE_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 <__ranges/access.h>
17753f127fSDimitry Andric #include <__ranges/concepts.h>
18753f127fSDimitry Andric #include <__ranges/dangling.h>
19753f127fSDimitry Andric #include <__utility/move.h>
20753f127fSDimitry Andric 
21753f127fSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22753f127fSDimitry Andric #  pragma GCC system_header
23753f127fSDimitry Andric #endif
24753f127fSDimitry Andric 
25*b3edf446SDimitry Andric _LIBCPP_PUSH_MACROS
26*b3edf446SDimitry Andric #include <__undef_macros>
27*b3edf446SDimitry Andric 
2806c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20
29753f127fSDimitry Andric 
30753f127fSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD
31753f127fSDimitry Andric 
32753f127fSDimitry Andric namespace ranges {
33753f127fSDimitry Andric 
34753f127fSDimitry Andric template <class _InIter, class _OutIter>
35753f127fSDimitry Andric using rotate_copy_result = in_out_result<_InIter, _OutIter>;
36753f127fSDimitry Andric 
37753f127fSDimitry Andric namespace __rotate_copy {
38753f127fSDimitry Andric struct __fn {
395f757f3fSDimitry Andric   template <forward_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter>
40753f127fSDimitry Andric     requires indirectly_copyable<_InIter, _OutIter>
4106c3fb27SDimitry Andric   _LIBCPP_HIDE_FROM_ABI constexpr rotate_copy_result<_InIter, _OutIter>
operator__fn42753f127fSDimitry Andric   operator()(_InIter __first, _InIter __middle, _Sent __last, _OutIter __result) const {
43753f127fSDimitry Andric     auto __res1 = ranges::copy(__middle, __last, std::move(__result));
44753f127fSDimitry Andric     auto __res2 = ranges::copy(__first, __middle, std::move(__res1.out));
45753f127fSDimitry Andric     return {std::move(__res1.in), std::move(__res2.out)};
46753f127fSDimitry Andric   }
47753f127fSDimitry Andric 
485f757f3fSDimitry Andric   template <forward_range _Range, weakly_incrementable _OutIter>
49753f127fSDimitry Andric     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
5006c3fb27SDimitry Andric   _LIBCPP_HIDE_FROM_ABI constexpr rotate_copy_result<borrowed_iterator_t<_Range>, _OutIter>
operator__fn51753f127fSDimitry Andric   operator()(_Range&& __range, iterator_t<_Range> __middle, _OutIter __result) const {
52753f127fSDimitry Andric     return (*this)(ranges::begin(__range), std::move(__middle), ranges::end(__range), std::move(__result));
53753f127fSDimitry Andric   }
54753f127fSDimitry Andric };
55753f127fSDimitry Andric } // namespace __rotate_copy
56753f127fSDimitry Andric 
57753f127fSDimitry Andric inline namespace __cpo {
58753f127fSDimitry Andric inline constexpr auto rotate_copy = __rotate_copy::__fn{};
59753f127fSDimitry Andric } // namespace __cpo
60753f127fSDimitry Andric } // namespace ranges
61753f127fSDimitry Andric 
62753f127fSDimitry Andric _LIBCPP_END_NAMESPACE_STD
63753f127fSDimitry Andric 
6406c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20
65753f127fSDimitry Andric 
66*b3edf446SDimitry Andric _LIBCPP_POP_MACROS
67*b3edf446SDimitry Andric 
68753f127fSDimitry Andric #endif // _LIBCPP___ALGORITHM_RANGES_ROTATE_COPY_H
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