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_MOVE_BACKWARD_H
10 #define _LIBCPP___ALGORITHM_RANGES_MOVE_BACKWARD_H
11 
12 #include <__algorithm/in_out_result.h>
13 #include <__algorithm/iterator_operations.h>
14 #include <__algorithm/move_backward.h>
15 #include <__config>
16 #include <__iterator/concepts.h>
17 #include <__iterator/iter_move.h>
18 #include <__iterator/next.h>
19 #include <__ranges/access.h>
20 #include <__ranges/concepts.h>
21 #include <__ranges/dangling.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 move_backward_result = in_out_result<_InIter, _OutIter>;
36 
37 namespace __move_backward {
38 struct __fn {
39   template <class _InIter, class _Sent, class _OutIter>
40   _LIBCPP_HIDE_FROM_ABI constexpr static move_backward_result<_InIter, _OutIter>
41   __move_backward_impl(_InIter __first, _Sent __last, _OutIter __result) {
42     auto __ret = std::__move_backward<_RangeAlgPolicy>(std::move(__first), std::move(__last), std::move(__result));
43     return {std::move(__ret.first), std::move(__ret.second)};
44   }
45 
46   template <bidirectional_iterator _InIter, sentinel_for<_InIter> _Sent, bidirectional_iterator _OutIter>
47     requires indirectly_movable<_InIter, _OutIter>
48   _LIBCPP_HIDE_FROM_ABI constexpr move_backward_result<_InIter, _OutIter>
49   operator()(_InIter __first, _Sent __last, _OutIter __result) const {
50     return __move_backward_impl(std::move(__first), std::move(__last), std::move(__result));
51   }
52 
53   template <bidirectional_range _Range, bidirectional_iterator _Iter>
54     requires indirectly_movable<iterator_t<_Range>, _Iter>
55   _LIBCPP_HIDE_FROM_ABI constexpr move_backward_result<borrowed_iterator_t<_Range>, _Iter>
56   operator()(_Range&& __range, _Iter __result) const {
57     return __move_backward_impl(ranges::begin(__range), ranges::end(__range), std::move(__result));
58   }
59 };
60 } // namespace __move_backward
61 
62 inline namespace __cpo {
63 inline constexpr auto move_backward = __move_backward::__fn{};
64 } // namespace __cpo
65 } // namespace ranges
66 
67 _LIBCPP_END_NAMESPACE_STD
68 
69 #endif // _LIBCPP_STD_VER >= 20
70 
71 #endif // _LIBCPP___ALGORITHM_RANGES_MOVE_BACKWARD_H
72