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_COPY_BACKWARD_H
10 #define _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H
11 
12 #include <__algorithm/copy_backward.h>
13 #include <__algorithm/in_out_result.h>
14 #include <__algorithm/iterator_operations.h>
15 #include <__config>
16 #include <__iterator/concepts.h>
17 #include <__ranges/access.h>
18 #include <__ranges/concepts.h>
19 #include <__ranges/dangling.h>
20 #include <__utility/move.h>
21 
22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23 #  pragma GCC system_header
24 #endif
25 
26 #if _LIBCPP_STD_VER > 17
27 
28 _LIBCPP_BEGIN_NAMESPACE_STD
29 
30 namespace ranges {
31 
32 template<class _Ip, class _Op>
33 using copy_backward_result = in_out_result<_Ip, _Op>;
34 
35 namespace __copy_backward {
36 struct __fn {
37 
38   template <bidirectional_iterator _InIter1, sentinel_for<_InIter1> _Sent1, bidirectional_iterator _InIter2>
39     requires indirectly_copyable<_InIter1, _InIter2>
40   _LIBCPP_HIDE_FROM_ABI constexpr
41   copy_backward_result<_InIter1, _InIter2> operator()(_InIter1 __first, _Sent1 __last, _InIter2 __result) const {
42     auto __ret = std::__copy_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_range _Range, bidirectional_iterator _Iter>
47     requires indirectly_copyable<iterator_t<_Range>, _Iter>
48   _LIBCPP_HIDE_FROM_ABI constexpr
49   copy_backward_result<borrowed_iterator_t<_Range>, _Iter> operator()(_Range&& __r, _Iter __result) const {
50     auto __ret = std::__copy_backward<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), std::move(__result));
51     return {std::move(__ret.first), std::move(__ret.second)};
52   }
53 };
54 } // namespace __copy_backward
55 
56 inline namespace __cpo {
57   inline constexpr auto copy_backward = __copy_backward::__fn{};
58 } // namespace __cpo
59 } // namespace ranges
60 
61 _LIBCPP_END_NAMESPACE_STD
62 
63 #endif // _LIBCPP_STD_VER > 17
64 
65 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H
66