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 <__iterator/reverse_iterator.h>
18 #include <__ranges/access.h>
19 #include <__ranges/concepts.h>
20 #include <__ranges/dangling.h>
21 #include <__utility/move.h>
22 
23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24 #  pragma GCC system_header
25 #endif
26 
27 #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
28 
29 _LIBCPP_BEGIN_NAMESPACE_STD
30 
31 namespace ranges {
32 
33 template<class _Ip, class _Op>
34 using copy_backward_result = in_out_result<_Ip, _Op>;
35 
36 namespace __copy_backward {
37 struct __fn {
38 
39   template <bidirectional_iterator _InIter1, sentinel_for<_InIter1> _Sent1, bidirectional_iterator _InIter2>
40     requires indirectly_copyable<_InIter1, _InIter2>
41   _LIBCPP_HIDE_FROM_ABI constexpr
42   copy_backward_result<_InIter1, _InIter2> operator()(_InIter1 __first, _Sent1 __last, _InIter2 __result) const {
43     auto __ret = std::__copy_backward<_RangeAlgPolicy>(std::move(__first), std::move(__last), std::move(__result));
44     return {std::move(__ret.first), std::move(__ret.second)};
45   }
46 
47   template <bidirectional_range _Range, bidirectional_iterator _Iter>
48     requires indirectly_copyable<iterator_t<_Range>, _Iter>
49   _LIBCPP_HIDE_FROM_ABI constexpr
50   copy_backward_result<borrowed_iterator_t<_Range>, _Iter> operator()(_Range&& __r, _Iter __result) const {
51     auto __ret = std::__copy_backward<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), std::move(__result));
52     return {std::move(__ret.first), std::move(__ret.second)};
53   }
54 };
55 } // namespace __copy_backward
56 
57 inline namespace __cpo {
58   inline constexpr auto copy_backward = __copy_backward::__fn{};
59 } // namespace __cpo
60 } // namespace ranges
61 
62 _LIBCPP_END_NAMESPACE_STD
63 
64 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
65 
66 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H
67