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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_move_common.h>
13 : #include <__algorithm/iterator_operations.h>
14 : #include <__algorithm/min.h>
15 : #include <__config>
16 : #include <__iterator/segmented_iterator.h>
17 : #include <__type_traits/common_type.h>
18 : #include <__type_traits/is_copy_constructible.h>
19 : #include <__utility/move.h>
20 : #include <__utility/pair.h>
21 :
22 : #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23 : # pragma GCC system_header
24 : #endif
25 :
26 : _LIBCPP_PUSH_MACROS
27 : #include <__undef_macros>
28 :
29 : _LIBCPP_BEGIN_NAMESPACE_STD
30 :
31 : template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
32 : inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
33 : __move(_InIter __first, _Sent __last, _OutIter __result);
34 :
35 : template <class _AlgPolicy>
36 : struct __move_loop {
37 : template <class _InIter, class _Sent, class _OutIter>
38 : _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
39 2462 : operator()(_InIter __first, _Sent __last, _OutIter __result) const {
40 6458 : while (__first != __last) {
41 3996 : *__result = _IterOps<_AlgPolicy>::__iter_move(__first);
42 3996 : ++__first;
43 3996 : ++__result;
44 : }
45 2462 : return std::make_pair(std::move(__first), std::move(__result));
46 : }
47 :
48 : template <class _InIter, class _OutIter, __enable_if_t<__is_segmented_iterator<_InIter>::value, int> = 0>
49 : _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
50 : operator()(_InIter __first, _InIter __last, _OutIter __result) const {
51 : using _Traits = __segmented_iterator_traits<_InIter>;
52 : auto __sfirst = _Traits::__segment(__first);
53 : auto __slast = _Traits::__segment(__last);
54 : if (__sfirst == __slast) {
55 : auto __iters = std::__move<_AlgPolicy>(_Traits::__local(__first), _Traits::__local(__last), std::move(__result));
56 : return std::make_pair(__last, std::move(__iters.second));
57 : }
58 :
59 : __result = std::__move<_AlgPolicy>(_Traits::__local(__first), _Traits::__end(__sfirst), std::move(__result)).second;
60 : ++__sfirst;
61 : while (__sfirst != __slast) {
62 : __result =
63 : std::__move<_AlgPolicy>(_Traits::__begin(__sfirst), _Traits::__end(__sfirst), std::move(__result)).second;
64 : ++__sfirst;
65 : }
66 : __result =
67 : std::__move<_AlgPolicy>(_Traits::__begin(__sfirst), _Traits::__local(__last), std::move(__result)).second;
68 : return std::make_pair(__last, std::move(__result));
69 : }
70 :
71 : template <class _InIter,
72 : class _OutIter,
73 : __enable_if_t<__is_cpp17_random_access_iterator<_InIter>::value &&
74 : !__is_segmented_iterator<_InIter>::value && __is_segmented_iterator<_OutIter>::value,
75 : int> = 0>
76 : _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
77 : operator()(_InIter __first, _InIter __last, _OutIter __result) {
78 : using _Traits = __segmented_iterator_traits<_OutIter>;
79 : using _DiffT = typename common_type<__iter_diff_t<_InIter>, __iter_diff_t<_OutIter> >::type;
80 :
81 : if (__first == __last)
82 : return std::make_pair(std::move(__first), std::move(__result));
83 :
84 : auto __local_first = _Traits::__local(__result);
85 : auto __segment_iterator = _Traits::__segment(__result);
86 : while (true) {
87 : auto __local_last = _Traits::__end(__segment_iterator);
88 : auto __size = std::min<_DiffT>(__local_last - __local_first, __last - __first);
89 : auto __iters = std::__move<_AlgPolicy>(__first, __first + __size, __local_first);
90 : __first = std::move(__iters.first);
91 :
92 : if (__first == __last)
93 : return std::make_pair(std::move(__first), _Traits::__compose(__segment_iterator, std::move(__iters.second)));
94 :
95 : __local_first = _Traits::__begin(++__segment_iterator);
96 : }
97 : }
98 : };
99 :
100 : struct __move_trivial {
101 : // At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer.
102 : template <class _In, class _Out,
103 : __enable_if_t<__can_lower_move_assignment_to_memmove<_In, _Out>::value, int> = 0>
104 : _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*>
105 0 : operator()(_In* __first, _In* __last, _Out* __result) const {
106 0 : return std::__copy_trivial_impl(__first, __last, __result);
107 : }
108 : };
109 :
110 : template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
111 : inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
112 2462 : __move(_InIter __first, _Sent __last, _OutIter __result) {
113 2462 : return std::__dispatch_copy_or_move<_AlgPolicy, __move_loop<_AlgPolicy>, __move_trivial>(
114 2462 : std::move(__first), std::move(__last), std::move(__result));
115 : }
116 :
117 : template <class _InputIterator, class _OutputIterator>
118 : inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
119 2462 : move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
120 : static_assert(is_copy_constructible<_InputIterator>::value, "Iterators has to be copy constructible.");
121 : static_assert(is_copy_constructible<_OutputIterator>::value, "The output iterator has to be copy constructible.");
122 :
123 2462 : return std::__move<_ClassicAlgPolicy>(std::move(__first), std::move(__last), std::move(__result)).second;
124 : }
125 :
126 : _LIBCPP_END_NAMESPACE_STD
127 :
128 : _LIBCPP_POP_MACROS
129 :
130 : #endif // _LIBCPP___ALGORITHM_MOVE_H
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