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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___CXX03___ITERATOR_REVERSE_ITERATOR_H
11#define _LIBCPP___CXX03___ITERATOR_REVERSE_ITERATOR_H
12
13#include <__cxx03/__algorithm/unwrap_iter.h>
14#include <__cxx03/__config>
15#include <__cxx03/__iterator/advance.h>
16#include <__cxx03/__iterator/iterator.h>
17#include <__cxx03/__iterator/iterator_traits.h>
18#include <__cxx03/__iterator/next.h>
19#include <__cxx03/__iterator/prev.h>
20#include <__cxx03/__iterator/segmented_iterator.h>
21#include <__cxx03/__memory/addressof.h>
22#include <__cxx03/__type_traits/conditional.h>
23#include <__cxx03/__type_traits/enable_if.h>
24#include <__cxx03/__type_traits/is_assignable.h>
25#include <__cxx03/__type_traits/is_convertible.h>
26#include <__cxx03/__type_traits/is_nothrow_constructible.h>
27#include <__cxx03/__type_traits/is_pointer.h>
28#include <__cxx03/__type_traits/is_same.h>
29#include <__cxx03/__utility/declval.h>
30#include <__cxx03/__utility/move.h>
31
32#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
33# pragma GCC system_header
34#endif
35
36_LIBCPP_BEGIN_NAMESPACE_STD
37
38_LIBCPP_SUPPRESS_DEPRECATED_PUSH
39template <class _Iter>
40class _LIBCPP_TEMPLATE_VIS reverse_iterator
41 : public iterator<typename iterator_traits<_Iter>::iterator_category,
42 typename iterator_traits<_Iter>::value_type,
43 typename iterator_traits<_Iter>::difference_type,
44 typename iterator_traits<_Iter>::pointer,
45 typename iterator_traits<_Iter>::reference> {
46 _LIBCPP_SUPPRESS_DEPRECATED_POP
47
48private:
49#ifndef _LIBCPP_ABI_NO_ITERATOR_BASES
50 _Iter __t_; // no longer used as of LWG #2360, not removed due to ABI break
51#endif
52
53protected:
54 _Iter current;
55
56public:
57 using iterator_type = _Iter;
58
59 using iterator_category =
60 _If<__has_random_access_iterator_category<_Iter>::value,
61 random_access_iterator_tag,
62 typename iterator_traits<_Iter>::iterator_category>;
63 using pointer = typename iterator_traits<_Iter>::pointer;
64 using value_type = typename iterator_traits<_Iter>::value_type;
65 using difference_type = typename iterator_traits<_Iter>::difference_type;
66 using reference = typename iterator_traits<_Iter>::reference;
67
68#ifndef _LIBCPP_ABI_NO_ITERATOR_BASES
69 _LIBCPP_HIDE_FROM_ABI reverse_iterator() : __t_(), current() {}
70
71 _LIBCPP_HIDE_FROM_ABI explicit reverse_iterator(_Iter __x) : __t_(__x), current(__x) {}
72
73 template <class _Up, __enable_if_t<!is_same<_Up, _Iter>::value && is_convertible<_Up const&, _Iter>::value, int> = 0>
74 _LIBCPP_HIDE_FROM_ABI reverse_iterator(const reverse_iterator<_Up>& __u) : __t_(__u.base()), current(__u.base()) {}
75
76 template <class _Up,
77 __enable_if_t<!is_same<_Up, _Iter>::value && is_convertible<_Up const&, _Iter>::value &&
78 is_assignable<_Iter&, _Up const&>::value,
79 int> = 0>
80 _LIBCPP_HIDE_FROM_ABI reverse_iterator& operator=(const reverse_iterator<_Up>& __u) {
81 __t_ = current = __u.base();
82 return *this;
83 }
84#else
85 _LIBCPP_HIDE_FROM_ABI reverse_iterator() : current() {}
86
87 _LIBCPP_HIDE_FROM_ABI explicit reverse_iterator(_Iter __x) : current(__x) {}
88
89 template <class _Up, __enable_if_t<!is_same<_Up, _Iter>::value && is_convertible<_Up const&, _Iter>::value, int> = 0>
90 _LIBCPP_HIDE_FROM_ABI reverse_iterator(const reverse_iterator<_Up>& __u) : current(__u.base()) {}
91
92 template <class _Up,
93 __enable_if_t<!is_same<_Up, _Iter>::value && is_convertible<_Up const&, _Iter>::value &&
94 is_assignable<_Iter&, _Up const&>::value,
95 int> = 0>
96 _LIBCPP_HIDE_FROM_ABI reverse_iterator& operator=(const reverse_iterator<_Up>& __u) {
97 current = __u.base();
98 return *this;
99 }
100#endif
101 _LIBCPP_HIDE_FROM_ABI _Iter base() const { return current; }
102 _LIBCPP_HIDE_FROM_ABI reference operator*() const {
103 _Iter __tmp = current;
104 return *--__tmp;
105 }
106
107 _LIBCPP_HIDE_FROM_ABI pointer operator->() const { return std::addressof(operator*()); }
108
109 _LIBCPP_HIDE_FROM_ABI reverse_iterator& operator++() {
110 --current;
111 return *this;
112 }
113 _LIBCPP_HIDE_FROM_ABI reverse_iterator operator++(int) {
114 reverse_iterator __tmp(*this);
115 --current;
116 return __tmp;
117 }
118 _LIBCPP_HIDE_FROM_ABI reverse_iterator& operator--() {
119 ++current;
120 return *this;
121 }
122 _LIBCPP_HIDE_FROM_ABI reverse_iterator operator--(int) {
123 reverse_iterator __tmp(*this);
124 ++current;
125 return __tmp;
126 }
127 _LIBCPP_HIDE_FROM_ABI reverse_iterator operator+(difference_type __n) const {
128 return reverse_iterator(current - __n);
129 }
130 _LIBCPP_HIDE_FROM_ABI reverse_iterator& operator+=(difference_type __n) {
131 current -= __n;
132 return *this;
133 }
134 _LIBCPP_HIDE_FROM_ABI reverse_iterator operator-(difference_type __n) const {
135 return reverse_iterator(current + __n);
136 }
137 _LIBCPP_HIDE_FROM_ABI reverse_iterator& operator-=(difference_type __n) {
138 current += __n;
139 return *this;
140 }
141 _LIBCPP_HIDE_FROM_ABI reference operator[](difference_type __n) const { return *(*this + __n); }
142};
143
144template <class _Iter1, class _Iter2>
145inline _LIBCPP_HIDE_FROM_ABI bool operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) {
146 return __x.base() == __y.base();
147}
148
149template <class _Iter1, class _Iter2>
150inline _LIBCPP_HIDE_FROM_ABI bool operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) {
151 return __x.base() > __y.base();
152}
153
154template <class _Iter1, class _Iter2>
155inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) {
156 return __x.base() != __y.base();
157}
158
159template <class _Iter1, class _Iter2>
160inline _LIBCPP_HIDE_FROM_ABI bool operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) {
161 return __x.base() < __y.base();
162}
163
164template <class _Iter1, class _Iter2>
165inline _LIBCPP_HIDE_FROM_ABI bool operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) {
166 return __x.base() <= __y.base();
167}
168
169template <class _Iter1, class _Iter2>
170inline _LIBCPP_HIDE_FROM_ABI bool operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) {
171 return __x.base() >= __y.base();
172}
173
174template <class _Iter1, class _Iter2>
175inline _LIBCPP_HIDE_FROM_ABI typename reverse_iterator<_Iter1>::difference_type
176operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) {
177 return __y.base() - __x.base();
178}
179
180template <class _Iter>
181inline _LIBCPP_HIDE_FROM_ABI reverse_iterator<_Iter>
182operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x) {
183 return reverse_iterator<_Iter>(__x.base() - __n);
184}
185
186template <class _Iter, bool __b>
187struct __unwrap_iter_impl<reverse_iterator<reverse_iterator<_Iter> >, __b> {
188 using _UnwrappedIter = decltype(__unwrap_iter_impl<_Iter>::__unwrap(std::declval<_Iter>()));
189 using _ReverseWrapper = reverse_iterator<reverse_iterator<_Iter> >;
190
191 static _LIBCPP_HIDE_FROM_ABI _ReverseWrapper __rewrap(_ReverseWrapper __orig_iter, _UnwrappedIter __unwrapped_iter) {
192 return _ReverseWrapper(
193 reverse_iterator<_Iter>(__unwrap_iter_impl<_Iter>::__rewrap(__orig_iter.base().base(), __unwrapped_iter)));
194 }
195
196 static _LIBCPP_HIDE_FROM_ABI _UnwrappedIter __unwrap(_ReverseWrapper __i) _NOEXCEPT {
197 return __unwrap_iter_impl<_Iter>::__unwrap(__i.base().base());
198 }
199};
200
201_LIBCPP_END_NAMESPACE_STD
202
203#endif // _LIBCPP___CXX03___ITERATOR_REVERSE_ITERATOR_H
204

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source code of libcxx/include/__cxx03/__iterator/reverse_iterator.h