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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_MOVE_H
10#define _LIBCPP___ALGORITHM_MOVE_H
11
12#include <__algorithm/copy.h>
13#include <__algorithm/copy_move_common.h>
14#include <__algorithm/for_each_segment.h>
15#include <__algorithm/iterator_operations.h>
16#include <__algorithm/min.h>
17#include <__config>
18#include <__fwd/bit_reference.h>
19#include <__iterator/iterator_traits.h>
20#include <__iterator/segmented_iterator.h>
21#include <__type_traits/common_type.h>
22#include <__type_traits/enable_if.h>
23#include <__type_traits/is_constructible.h>
24#include <__utility/move.h>
25#include <__utility/pair.h>
26
27#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
28# pragma GCC system_header
29#endif
30
31_LIBCPP_PUSH_MACROS
32#include <__undef_macros>
33
34_LIBCPP_BEGIN_NAMESPACE_STD
35
36template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
37inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
38__move(_InIter __first, _Sent __last, _OutIter __result);
39
40template <class _AlgPolicy>
41struct __move_impl {
42 template <class _InIter, class _Sent, class _OutIter>
43 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
44 operator()(_InIter __first, _Sent __last, _OutIter __result) const {
45 while (__first != __last) {
46 *__result = _IterOps<_AlgPolicy>::__iter_move(__first);
47 ++__first;
48 ++__result;
49 }
50 return std::make_pair(std::move(__first), std::move(__result));
51 }
52
53 template <class _InIter, class _OutIter>
54 struct _MoveSegment {
55 using _Traits _LIBCPP_NODEBUG = __segmented_iterator_traits<_InIter>;
56
57 _OutIter& __result_;
58
59 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit _MoveSegment(_OutIter& __result)
60 : __result_(__result) {}
61
62 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
63 operator()(typename _Traits::__local_iterator __lfirst, typename _Traits::__local_iterator __llast) {
64 __result_ = std::__move<_AlgPolicy>(__lfirst, __llast, std::move(__result_)).second;
65 }
66 };
67
68 template <class _InIter, class _OutIter, __enable_if_t<__is_segmented_iterator<_InIter>::value, int> = 0>
69 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
70 operator()(_InIter __first, _InIter __last, _OutIter __result) const {
71 std::__for_each_segment(__first, __last, _MoveSegment<_InIter, _OutIter>(__result));
72 return std::make_pair(__last, std::move(__result));
73 }
74
75 template <class _InIter,
76 class _OutIter,
77 __enable_if_t<__has_random_access_iterator_category<_InIter>::value &&
78 !__is_segmented_iterator<_InIter>::value && __is_segmented_iterator<_OutIter>::value,
79 int> = 0>
80 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
81 operator()(_InIter __first, _InIter __last, _OutIter __result) const {
82 using _Traits = __segmented_iterator_traits<_OutIter>;
83 using _DiffT = typename common_type<__iter_diff_t<_InIter>, __iter_diff_t<_OutIter> >::type;
84
85 if (__first == __last)
86 return std::make_pair(std::move(__first), std::move(__result));
87
88 auto __local_first = _Traits::__local(__result);
89 auto __segment_iterator = _Traits::__segment(__result);
90 while (true) {
91 auto __local_last = _Traits::__end(__segment_iterator);
92 auto __size = std::min<_DiffT>(__local_last - __local_first, __last - __first);
93 auto __iters = std::__move<_AlgPolicy>(__first, __first + __size, __local_first);
94 __first = std::move(__iters.first);
95
96 if (__first == __last)
97 return std::make_pair(std::move(__first), _Traits::__compose(__segment_iterator, std::move(__iters.second)));
98
99 __local_first = _Traits::__begin(++__segment_iterator);
100 }
101 }
102
103 template <class _Cp, bool _IsConst>
104 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<__bit_iterator<_Cp, _IsConst>, __bit_iterator<_Cp, false> >
105 operator()(__bit_iterator<_Cp, _IsConst> __first,
106 __bit_iterator<_Cp, _IsConst> __last,
107 __bit_iterator<_Cp, false> __result) {
108 return std::__copy(__first, __last, __result);
109 }
110
111 // At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer.
112 template <class _In, class _Out, __enable_if_t<__can_lower_move_assignment_to_memmove<_In, _Out>::value, int> = 0>
113 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*>
114 operator()(_In* __first, _In* __last, _Out* __result) const {
115 return std::__copy_trivial_impl(__first, __last, __result);
116 }
117};
118
119template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
120inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
121__move(_InIter __first, _Sent __last, _OutIter __result) {
122 return std::__copy_move_unwrap_iters<__move_impl<_AlgPolicy> >(
123 std::move(__first), std::move(__last), std::move(__result));
124}
125
126template <class _InputIterator, class _OutputIterator>
127inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
128move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
129 static_assert(is_copy_constructible<_InputIterator>::value, "Iterators has to be copy constructible.");
130 static_assert(is_copy_constructible<_OutputIterator>::value, "The output iterator has to be copy constructible.");
131
132 return std::__move<_ClassicAlgPolicy>(std::move(__first), std::move(__last), std::move(__result)).second;
133}
134
135_LIBCPP_END_NAMESPACE_STD
136
137_LIBCPP_POP_MACROS
138
139#endif // _LIBCPP___ALGORITHM_MOVE_H