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_COPY_H
10#define _LIBCPP___ALGORITHM_COPY_H
11
12#include <__algorithm/copy_move_common.h>
13#include <__algorithm/for_each_segment.h>
14#include <__algorithm/min.h>
15#include <__algorithm/specialized_algorithms.h>
16#include <__config>
17#include <__iterator/iterator_traits.h>
18#include <__iterator/segmented_iterator.h>
19#include <__type_traits/common_type.h>
20#include <__type_traits/enable_if.h>
21#include <__utility/move.h>
22#include <__utility/pair.h>
23
24#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
25# pragma GCC system_header
26#endif
27
28_LIBCPP_PUSH_MACROS
29#include <__undef_macros>
30
31_LIBCPP_BEGIN_NAMESPACE_STD
32
33template <class _InputIterator, class _OutputIterator>
34inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
35copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result);
36
37template <class _InIter, class _Sent, class _OutIter>
38inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> __copy(_InIter, _Sent, _OutIter);
39
40struct __copy_impl {
41 template <class _InIter,
42 class _Sent,
43 class _OutIter,
44 __enable_if_t<!__specialized_algorithm<_Algorithm::__copy,
45 __iterator_pair<_InIter, _Sent>,
46 __single_iterator<_OutIter> >::__has_algorithm,
47 int> = 0>
48 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
49 operator()(_InIter __first, _Sent __last, _OutIter __result) const {
50 while (__first != __last) {
51 *__result = *__first;
52 ++__first;
53 ++__result;
54 }
55
56 return std::make_pair(std::move(__first), std::move(__result));
57 }
58
59 template <class _InIter,
60 class _Sent,
61 class _OutIter,
62 __enable_if_t<__specialized_algorithm<_Algorithm::__copy,
63 __iterator_pair<_InIter, _Sent>,
64 __single_iterator<_OutIter> >::__has_algorithm,
65 int> = 0>
66 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static pair<_InIter, _OutIter>
67 operator()(_InIter __first, _Sent __last, _OutIter __result) {
68 return __specialized_algorithm<_Algorithm::__copy, __iterator_pair<_InIter, _Sent>, __single_iterator<_OutIter> >()(
69 std::move(__first), std::move(__last), std::move(__result));
70 }
71
72 template <class _InIter, class _OutIter, __enable_if_t<__is_segmented_iterator_v<_InIter>, int> = 0>
73 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
74 operator()(_InIter __first, _InIter __last, _OutIter __result) const {
75 using __local_iterator = typename __segmented_iterator_traits<_InIter>::__local_iterator;
76 std::__for_each_segment(__first, __last, [&__result](__local_iterator __lfirst, __local_iterator __llast) {
77 __result = std::__copy(std::move(__lfirst), std::move(__llast), std::move(__result)).second;
78 });
79 return std::make_pair(__last, std::move(__result));
80 }
81
82 template <class _InIter,
83 class _OutIter,
84 __enable_if_t<__has_random_access_iterator_category<_InIter>::value &&
85 !__is_segmented_iterator_v<_InIter> && __is_segmented_iterator_v<_OutIter>,
86 int> = 0>
87 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
88 operator()(_InIter __first, _InIter __last, _OutIter __result) const {
89 using _Traits = __segmented_iterator_traits<_OutIter>;
90 using _DiffT =
91 typename common_type<__iterator_difference_type<_InIter>, __iterator_difference_type<_OutIter> >::type;
92
93 if (__first == __last)
94 return std::make_pair(std::move(__first), std::move(__result));
95
96 auto __local_first = _Traits::__local(__result);
97 auto __segment_iterator = _Traits::__segment(__result);
98 while (true) {
99 auto __local_last = _Traits::__end(__segment_iterator);
100 auto __size = std::min<_DiffT>(__local_last - __local_first, __last - __first);
101 auto __iters = std::__copy(__first, __first + __size, __local_first);
102 __first = std::move(__iters.first);
103
104 if (__first == __last)
105 return std::make_pair(std::move(__first), _Traits::__compose(__segment_iterator, std::move(__iters.second)));
106
107 __local_first = _Traits::__begin(++__segment_iterator);
108 }
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_copy_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 _InIter, class _Sent, class _OutIter>
120pair<_InIter, _OutIter> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
121__copy(_InIter __first, _Sent __last, _OutIter __result) {
122 return std::__copy_move_unwrap_iters<__copy_impl>(std::move(__first), std::move(__last), std::move(__result));
123}
124
125template <class _InputIterator, class _OutputIterator>
126_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
127copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
128 return std::__copy(__first, __last, __result).second;
129}
130
131_LIBCPP_END_NAMESPACE_STD
132
133_LIBCPP_POP_MACROS
134
135#endif // _LIBCPP___ALGORITHM_COPY_H
136