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1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___ITERATOR_MOVE_ITERATOR_H
11#define _LIBCPP___ITERATOR_MOVE_ITERATOR_H
12
13#include <__compare/compare_three_way_result.h>
14#include <__compare/three_way_comparable.h>
15#include <__concepts/assignable.h>
16#include <__concepts/convertible_to.h>
17#include <__concepts/derived_from.h>
18#include <__concepts/same_as.h>
19#include <__config>
20#include <__iterator/concepts.h>
21#include <__iterator/incrementable_traits.h>
22#include <__iterator/iter_move.h>
23#include <__iterator/iter_swap.h>
24#include <__iterator/iterator_traits.h>
25#include <__iterator/move_sentinel.h>
26#include <__iterator/readable_traits.h>
27#include <__type_traits/conditional.h>
28#include <__type_traits/enable_if.h>
29#include <__type_traits/is_assignable.h>
30#include <__type_traits/is_constructible.h>
31#include <__type_traits/is_convertible.h>
32#include <__type_traits/is_reference.h>
33#include <__type_traits/is_same.h>
34#include <__type_traits/remove_reference.h>
35#include <__utility/declval.h>
36#include <__utility/move.h>
37
38#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
39# pragma GCC system_header
40#endif
41
42_LIBCPP_PUSH_MACROS
43#include <__undef_macros>
44
45_LIBCPP_BEGIN_NAMESPACE_STD
46
47#if _LIBCPP_STD_VER >= 20
48template <class _Iter, class = void>
49struct __move_iter_category_base {};
50
51template <class _Iter>
52 requires requires { typename iterator_traits<_Iter>::iterator_category; }
53struct __move_iter_category_base<_Iter> {
54 using iterator_category =
55 _If< derived_from<typename iterator_traits<_Iter>::iterator_category, random_access_iterator_tag>,
56 random_access_iterator_tag,
57 typename iterator_traits<_Iter>::iterator_category >;
58};
59
60template <class _Iter, class _Sent>
61concept __move_iter_comparable = requires {
62 { std::declval<const _Iter&>() == std::declval<_Sent>() } -> convertible_to<bool>;
63};
64#endif // _LIBCPP_STD_VER >= 20
65
66template <class _Iter>
67class move_iterator
68#if _LIBCPP_STD_VER >= 20
69 : public __move_iter_category_base<_Iter>
70#endif
71{
72#if _LIBCPP_STD_VER >= 20
73
74private:
75 _LIBCPP_HIDE_FROM_ABI static constexpr auto __get_iter_concept() {
76 if constexpr (random_access_iterator<_Iter>) {
77 return random_access_iterator_tag{};
78 } else if constexpr (bidirectional_iterator<_Iter>) {
79 return bidirectional_iterator_tag{};
80 } else if constexpr (forward_iterator<_Iter>) {
81 return forward_iterator_tag{};
82 } else {
83 return input_iterator_tag{};
84 }
85 }
86#endif // _LIBCPP_STD_VER >= 20
87
88public:
89#if _LIBCPP_STD_VER >= 20
90 using iterator_type = _Iter;
91 using iterator_concept = decltype(__get_iter_concept());
92 // iterator_category is inherited and not always present
93 using value_type = iter_value_t<_Iter>;
94 using difference_type = iter_difference_t<_Iter>;
95 using pointer = _Iter;
96 using reference = iter_rvalue_reference_t<_Iter>;
97#else
98 typedef _Iter iterator_type;
99 typedef _If< __has_random_access_iterator_category<_Iter>::value,
100 random_access_iterator_tag,
101 typename iterator_traits<_Iter>::iterator_category >
102 iterator_category;
103 typedef typename iterator_traits<iterator_type>::value_type value_type;
104 typedef typename iterator_traits<iterator_type>::difference_type difference_type;
105 typedef iterator_type pointer;
106
107 typedef typename iterator_traits<iterator_type>::reference __reference;
108 typedef __conditional_t<is_reference<__reference>::value, __libcpp_remove_reference_t<__reference>&&, __reference>
109 reference;
110#endif // _LIBCPP_STD_VER >= 20
111
112 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 explicit move_iterator(_Iter __i) : __current_(std::move(__i)) {}
113
114 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator& operator++() {
115 ++__current_;
116 return *this;
117 }
118
119 _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 pointer operator->() const {
120 return __current_;
121 }
122
123#if _LIBCPP_STD_VER >= 20
124 _LIBCPP_HIDE_FROM_ABI constexpr move_iterator()
125 requires is_constructible_v<_Iter>
126 : __current_() {}
127
128 template <class _Up>
129 requires(!_IsSame<_Up, _Iter>::value) && convertible_to<const _Up&, _Iter>
130 _LIBCPP_HIDE_FROM_ABI constexpr move_iterator(const move_iterator<_Up>& __u) : __current_(__u.base()) {}
131
132 template <class _Up>
133 requires(!_IsSame<_Up, _Iter>::value) && convertible_to<const _Up&, _Iter> && assignable_from<_Iter&, const _Up&>
134 _LIBCPP_HIDE_FROM_ABI constexpr move_iterator& operator=(const move_iterator<_Up>& __u) {
135 __current_ = __u.base();
136 return *this;
137 }
138
139 _LIBCPP_HIDE_FROM_ABI constexpr const _Iter& base() const& noexcept { return __current_; }
140 _LIBCPP_HIDE_FROM_ABI constexpr _Iter base() && { return std::move(__current_); }
141
142 _LIBCPP_HIDE_FROM_ABI constexpr reference operator*() const { return ranges::iter_move(__current_); }
143 _LIBCPP_HIDE_FROM_ABI constexpr reference operator[](difference_type __n) const {
144 return ranges::iter_move(__current_ + __n);
145 }
146
147 _LIBCPP_HIDE_FROM_ABI constexpr auto operator++(int)
148 requires forward_iterator<_Iter>
149 {
150 move_iterator __tmp(*this);
151 ++__current_;
152 return __tmp;
153 }
154
155 _LIBCPP_HIDE_FROM_ABI constexpr void operator++(int) { ++__current_; }
156#else
157 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator() : __current_() {}
158
159 template <class _Up, __enable_if_t< !is_same<_Up, _Iter>::value && is_convertible<const _Up&, _Iter>::value, int> = 0>
160 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator(const move_iterator<_Up>& __u)
161 : __current_(__u.base()) {}
162
163 template <class _Up,
164 __enable_if_t< !is_same<_Up, _Iter>::value && is_convertible<const _Up&, _Iter>::value &&
165 is_assignable<_Iter&, const _Up&>::value,
166 int> = 0>
167 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator& operator=(const move_iterator<_Up>& __u) {
168 __current_ = __u.base();
169 return *this;
170 }
171
172 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 _Iter base() const { return __current_; }
173
174 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference operator*() const {
175 return static_cast<reference>(*__current_);
176 }
177 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference operator[](difference_type __n) const {
178 return static_cast<reference>(__current_[__n]);
179 }
180
181 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator operator++(int) {
182 move_iterator __tmp(*this);
183 ++__current_;
184 return __tmp;
185 }
186#endif // _LIBCPP_STD_VER >= 20
187
188 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator& operator--() {
189 --__current_;
190 return *this;
191 }
192 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator operator--(int) {
193 move_iterator __tmp(*this);
194 --__current_;
195 return __tmp;
196 }
197 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator operator+(difference_type __n) const {
198 return move_iterator(__current_ + __n);
199 }
200 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator& operator+=(difference_type __n) {
201 __current_ += __n;
202 return *this;
203 }
204 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator operator-(difference_type __n) const {
205 return move_iterator(__current_ - __n);
206 }
207 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator& operator-=(difference_type __n) {
208 __current_ -= __n;
209 return *this;
210 }
211
212#if _LIBCPP_STD_VER >= 20
213 template <sentinel_for<_Iter> _Sent>
214 friend _LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const move_iterator& __x, const move_sentinel<_Sent>& __y)
215 requires __move_iter_comparable<_Iter, _Sent>
216 {
217 return __x.base() == __y.base();
218 }
219
220 template <sized_sentinel_for<_Iter> _Sent>
221 friend _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter>
222 operator-(const move_sentinel<_Sent>& __x, const move_iterator& __y) {
223 return __x.base() - __y.base();
224 }
225
226 template <sized_sentinel_for<_Iter> _Sent>
227 friend _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter>
228 operator-(const move_iterator& __x, const move_sentinel<_Sent>& __y) {
229 return __x.base() - __y.base();
230 }
231
232 friend _LIBCPP_HIDE_FROM_ABI constexpr iter_rvalue_reference_t<_Iter>
233 iter_move(const move_iterator& __i) noexcept(noexcept(ranges::iter_move(__i.__current_))) {
234 return ranges::iter_move(__i.__current_);
235 }
236
237 template <indirectly_swappable<_Iter> _It2>
238 friend _LIBCPP_HIDE_FROM_ABI constexpr void
239 iter_swap(const move_iterator& __x,
240 const move_iterator<_It2>& __y) noexcept(noexcept(ranges::iter_swap(__x.__current_, __y.__current_))) {
241 return ranges::iter_swap(__x.__current_, __y.__current_);
242 }
243#endif // _LIBCPP_STD_VER >= 20
244
245private:
246 template <class _It2>
247 friend class move_iterator;
248
249 _Iter __current_;
250};
251_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(move_iterator);
252
253template <class _Iter1, class _Iter2>
254inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 bool
255operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) {
256 return __x.base() == __y.base();
257}
258
259#if _LIBCPP_STD_VER <= 17
260template <class _Iter1, class _Iter2>
261inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 bool
262operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) {
263 return __x.base() != __y.base();
264}
265#endif // _LIBCPP_STD_VER <= 17
266
267template <class _Iter1, class _Iter2>
268inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 bool
269operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) {
270 return __x.base() < __y.base();
271}
272
273template <class _Iter1, class _Iter2>
274inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 bool
275operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) {
276 return __x.base() > __y.base();
277}
278
279template <class _Iter1, class _Iter2>
280inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 bool
281operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) {
282 return __x.base() <= __y.base();
283}
284
285template <class _Iter1, class _Iter2>
286inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 bool
287operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) {
288 return __x.base() >= __y.base();
289}
290
291#if _LIBCPP_STD_VER >= 20
292template <class _Iter1, three_way_comparable_with<_Iter1> _Iter2>
293inline _LIBCPP_HIDE_FROM_ABI constexpr auto
294operator<=>(const move_iterator<_Iter1>& __x,
295 const move_iterator<_Iter2>& __y) -> compare_three_way_result_t<_Iter1, _Iter2> {
296 return __x.base() <=> __y.base();
297}
298#endif // _LIBCPP_STD_VER >= 20
299
300#ifndef _LIBCPP_CXX03_LANG
301template <class _Iter1, class _Iter2>
302inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 auto
303operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) -> decltype(__x.base() - __y.base()) {
304 return __x.base() - __y.base();
305}
306#else
307template <class _Iter1, class _Iter2>
308inline _LIBCPP_HIDE_FROM_ABI typename move_iterator<_Iter1>::difference_type
309operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) {
310 return __x.base() - __y.base();
311}
312#endif // !_LIBCPP_CXX03_LANG
313
314#if _LIBCPP_STD_VER >= 20
315template <class _Iter>
316inline _LIBCPP_HIDE_FROM_ABI constexpr move_iterator<_Iter>
317operator+(iter_difference_t<_Iter> __n, const move_iterator<_Iter>& __x)
318 requires requires {
319 { __x.base() + __n } -> same_as<_Iter>;
320 }
321{
322 return __x + __n;
323}
324#else
325template <class _Iter>
326inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator<_Iter>
327operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x) {
328 return move_iterator<_Iter>(__x.base() + __n);
329}
330#endif // _LIBCPP_STD_VER >= 20
331
332#if _LIBCPP_STD_VER >= 20
333template <class _Iter1, class _Iter2>
334 requires(!sized_sentinel_for<_Iter1, _Iter2>)
335inline constexpr bool disable_sized_sentinel_for<move_iterator<_Iter1>, move_iterator<_Iter2>> = true;
336#endif // _LIBCPP_STD_VER >= 20
337
338template <class _Iter>
339inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 move_iterator<_Iter> make_move_iterator(_Iter __i) {
340 return move_iterator<_Iter>(std::move(__i));
341}
342
343_LIBCPP_END_NAMESPACE_STD
344
345_LIBCPP_POP_MACROS
346
347#endif // _LIBCPP___ITERATOR_MOVE_ITERATOR_H
348

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source code of libcxx/include/__iterator/move_iterator.h