-
Notifications
You must be signed in to change notification settings - Fork 0
/
reverse_iterator.hpp
161 lines (129 loc) · 4.5 KB
/
reverse_iterator.hpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* reverse_iterator.hpp :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: ariahi <ariahi@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/01/24 09:22:04 by ariahi #+# #+# */
/* Updated: 2023/02/02 16:55:05 by ariahi ### ########.fr */
/* */
/* ************************************************************************** */
#ifndef REVERSE_ITERATOR_HPP
#define REVERSE_ITERATOR_HPP
#include "iterator_traits.hpp"
#include "random_access_iterator.hpp"
namespace ft
{
template<class Iter>
struct const_reverse_iterator;
template <class Iterator>
class reverse_iterator
{
public:
typedef Iterator iterator_type;
typedef typename iterator_traits<Iterator>::iterator_category iterator_category;
typedef typename iterator_traits<Iterator>::value_type value_type;
typedef typename iterator_traits<Iterator>::difference_type difference_type;
typedef typename iterator_traits<Iterator>::pointer pointer;
typedef typename iterator_traits<Iterator>::reference reference;
protected:
iterator_type current;
public:
reverse_iterator() : current() {}
explicit reverse_iterator(iterator_type other) : current(other) {};
template <class IT>
reverse_iterator(const reverse_iterator<IT> &other) {current = other.base();}
iterator_type base() const {return (current);}
reference operator*() const
{
iterator_type tmp = current;
return (*--tmp);
}
reverse_iterator operator+(difference_type n) const {return (reverse_iterator(current - n));}
reverse_iterator operator-(difference_type n) const {return (reverse_iterator(current + n));}
reverse_iterator &operator++()
{
--current;
return (*this);
}
reverse_iterator operator++(int)
{
reverse_iterator tmp = *this;
++(*this);
return (tmp);
}
reverse_iterator &operator+= (difference_type n)
{
current -= n;
return (*this);
}
reverse_iterator &operator--()
{
++current;
return (*this);
}
reverse_iterator operator--(int)
{
reverse_iterator tmp = *this;
--(*this);
return (tmp);
}
reverse_iterator &operator-=(difference_type n)
{
current += n;
return (*this);
}
pointer operator->() const
{
return &(operator*());
}
reference operator[](difference_type n) const
{
return *(*this + n);
}
// It's a cast operator. It's return a object constructed from current object.
operator const_reverse_iterator<Iterator>() const
{
// It's return a object constructed from current object
return (const_reverse_iterator<Iterator>(current));
}
}; // reverse_iterator
template <class L_Iterator, class R_Iterator>
typename reverse_iterator<L_Iterator>::difference_type
operator-(const reverse_iterator<L_Iterator> &lhs, const reverse_iterator<R_Iterator> &rhs)
{
return (rhs.base() - lhs.base());
}
template <class L_Iterator, class R_Iterator>
bool operator==(const reverse_iterator<L_Iterator> &lhs, const reverse_iterator<R_Iterator> &rhs)
{
return (rhs.base() == lhs.base());
}
template <class L_Iterator, class R_Iterator>
bool operator!=(const reverse_iterator<L_Iterator> &lhs, const reverse_iterator<R_Iterator> &rhs)
{
return (rhs.base() != lhs.base());
}
template <class L_Iterator, class R_Iterator>
bool operator>(const reverse_iterator<L_Iterator> &lhs, const reverse_iterator<R_Iterator> &rhs)
{
return (rhs.base() > lhs.base());
}
template <class L_Iterator, class R_Iterator>
bool operator<(const reverse_iterator<L_Iterator> &lhs, const reverse_iterator<R_Iterator> &rhs)
{
return (rhs.base() < lhs.base());
}
template <class L_Iterator, class R_Iterator>
bool operator>=(const reverse_iterator<L_Iterator> &lhs, const reverse_iterator<R_Iterator> &rhs)
{
return (rhs.base() >= lhs.base());
}
template <class L_Iterator, class R_Iterator>
bool operator<=(const reverse_iterator<L_Iterator> &lhs, const reverse_iterator<R_Iterator> &rhs)
{
return (rhs.base() <= lhs.base());
}
} // namespace ft
#endif