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_H
10 #define _LIBCPP___ALGORITHM_RANGES_MOVE_H
11 
12 #include <__algorithm/in_out_result.h>
13 #include <__algorithm/move.h>
14 #include <__config>
15 #include <__iterator/concepts.h>
16 #include <__iterator/iter_move.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 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
27 
28 _LIBCPP_BEGIN_NAMESPACE_STD
29 
30 namespace ranges {
31 
32 template <class _InIter, class _OutIter>
33 using move_result = in_out_result<_InIter, _OutIter>;
34 
35 namespace __move {
36 struct __fn {
37 
38   template <class _InIter, class _Sent, class _OutIter>
39     requires __iter_move::__move_deref<_InIter> // check that we are allowed to std::move() the value
40   _LIBCPP_HIDE_FROM_ABI constexpr static
41   move_result<_InIter, _OutIter> __move_impl(_InIter __first, _Sent __last, _OutIter __result) {
42     auto __ret = std::__move(std::move(__first), std::move(__last), std::move(__result));
43     return {std::move(__ret.first), std::move(__ret.second)};
44   }
45 
46   template <class _InIter, class _Sent, class _OutIter>
47   _LIBCPP_HIDE_FROM_ABI constexpr static
48   move_result<_InIter, _OutIter> __move_impl(_InIter __first, _Sent __last, _OutIter __result) {
49     while (__first != __last) {
50       *__result = ranges::iter_move(__first);
51       ++__first;
52       ++__result;
53     }
54     return {std::move(__first), std::move(__result)};
55   }
56 
57   template <input_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter>
58     requires indirectly_movable<_InIter, _OutIter>
59   _LIBCPP_HIDE_FROM_ABI constexpr
60   move_result<_InIter, _OutIter> operator()(_InIter __first, _Sent __last, _OutIter __result) const {
61     return __move_impl(std::move(__first), std::move(__last), std::move(__result));
62   }
63 
64   template <input_range _Range, weakly_incrementable _OutIter>
65     requires indirectly_movable<iterator_t<_Range>, _OutIter>
66   _LIBCPP_HIDE_FROM_ABI constexpr
67   move_result<borrowed_iterator_t<_Range>, _OutIter> operator()(_Range&& __range, _OutIter __result) const {
68     return __move_impl(ranges::begin(__range), ranges::end(__range), std::move(__result));
69   }
70 
71 };
72 } // namespace __move
73 
74 inline namespace __cpo {
75   inline constexpr auto move = __move::__fn{};
76 } // namespace __cpo
77 } // namespace ranges
78 
79 _LIBCPP_END_NAMESPACE_STD
80 
81 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
82 
83 #endif // _LIBCPP___ALGORITHM_RANGES_MOVE_H
84