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1 | ////////////////////////////////////////////////////////////////////////////// |
2 | // | |
3 | // (C) Copyright Ion Gaztanaga 2005-2013. | |
4 | // (C) Copyright Gennaro Prota 2003 - 2004. | |
5 | // | |
6 | // Distributed under the Boost Software License, Version 1.0. | |
7 | // (See accompanying file LICENSE_1_0.txt or copy at | |
8 | // http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | // See http://www.boost.org/libs/container for documentation. | |
11 | // | |
12 | ////////////////////////////////////////////////////////////////////////////// | |
13 | ||
14 | #ifndef BOOST_CONTAINER_DETAIL_TRANSFORM_ITERATORS_HPP | |
15 | #define BOOST_CONTAINER_DETAIL_TRANSFORM_ITERATORS_HPP | |
16 | ||
17 | #ifndef BOOST_CONFIG_HPP | |
18 | # include <boost/config.hpp> | |
19 | #endif | |
20 | ||
21 | #if defined(BOOST_HAS_PRAGMA_ONCE) | |
22 | # pragma once | |
23 | #endif | |
24 | ||
25 | #include <boost/container/detail/config_begin.hpp> | |
26 | #include <boost/container/detail/workaround.hpp> | |
27 | #include <boost/container/detail/type_traits.hpp> | |
28 | #include <boost/container/detail/iterator.hpp> | |
29 | ||
30 | namespace boost { | |
31 | namespace container { | |
32 | ||
33 | template <class PseudoReference> | |
34 | struct operator_arrow_proxy | |
35 | { | |
36 | operator_arrow_proxy(const PseudoReference &px) | |
37 | : m_value(px) | |
38 | {} | |
39 | ||
40 | typedef PseudoReference element_type; | |
41 | ||
42 | PseudoReference* operator->() const { return &m_value; } | |
43 | ||
44 | mutable PseudoReference m_value; | |
45 | }; | |
46 | ||
47 | template <class T> | |
48 | struct operator_arrow_proxy<T&> | |
49 | { | |
50 | operator_arrow_proxy(T &px) | |
51 | : m_value(px) | |
52 | {} | |
53 | ||
54 | typedef T element_type; | |
55 | ||
56 | T* operator->() const { return const_cast<T*>(&m_value); } | |
57 | ||
58 | T &m_value; | |
59 | }; | |
60 | ||
61 | template <class Iterator, class UnaryFunction> | |
62 | class transform_iterator | |
63 | : public UnaryFunction | |
64 | , public boost::container::iterator | |
65 | < typename Iterator::iterator_category | |
66 | , typename container_detail::remove_reference<typename UnaryFunction::result_type>::type | |
67 | , typename Iterator::difference_type | |
68 | , operator_arrow_proxy<typename UnaryFunction::result_type> | |
69 | , typename UnaryFunction::result_type> | |
70 | { | |
71 | public: | |
72 | explicit transform_iterator(const Iterator &it, const UnaryFunction &f = UnaryFunction()) | |
73 | : UnaryFunction(f), m_it(it) | |
74 | {} | |
75 | ||
76 | explicit transform_iterator() | |
77 | : UnaryFunction(), m_it() | |
78 | {} | |
79 | ||
80 | //Constructors | |
81 | transform_iterator& operator++() | |
82 | { increment(); return *this; } | |
83 | ||
84 | transform_iterator operator++(int) | |
85 | { | |
86 | transform_iterator result (*this); | |
87 | increment(); | |
88 | return result; | |
89 | } | |
90 | ||
91 | friend bool operator== (const transform_iterator& i, const transform_iterator& i2) | |
92 | { return i.equal(i2); } | |
93 | ||
94 | friend bool operator!= (const transform_iterator& i, const transform_iterator& i2) | |
95 | { return !(i == i2); } | |
96 | ||
97 | /* | |
98 | friend bool operator> (const transform_iterator& i, const transform_iterator& i2) | |
99 | { return i2 < i; } | |
100 | ||
101 | friend bool operator<= (const transform_iterator& i, const transform_iterator& i2) | |
102 | { return !(i > i2); } | |
103 | ||
104 | friend bool operator>= (const transform_iterator& i, const transform_iterator& i2) | |
105 | { return !(i < i2); } | |
106 | */ | |
107 | friend typename Iterator::difference_type operator- (const transform_iterator& i, const transform_iterator& i2) | |
108 | { return i2.distance_to(i); } | |
109 | ||
110 | //Arithmetic | |
111 | transform_iterator& operator+=(typename Iterator::difference_type off) | |
112 | { this->advance(off); return *this; } | |
113 | ||
114 | transform_iterator operator+(typename Iterator::difference_type off) const | |
115 | { | |
116 | transform_iterator other(*this); | |
117 | other.advance(off); | |
118 | return other; | |
119 | } | |
120 | ||
121 | friend transform_iterator operator+(typename Iterator::difference_type off, const transform_iterator& right) | |
122 | { return right + off; } | |
123 | ||
124 | transform_iterator& operator-=(typename Iterator::difference_type off) | |
125 | { this->advance(-off); return *this; } | |
126 | ||
127 | transform_iterator operator-(typename Iterator::difference_type off) const | |
128 | { return *this + (-off); } | |
129 | ||
130 | typename UnaryFunction::result_type operator*() const | |
131 | { return dereference(); } | |
132 | ||
133 | operator_arrow_proxy<typename UnaryFunction::result_type> | |
134 | operator->() const | |
135 | { return operator_arrow_proxy<typename UnaryFunction::result_type>(dereference()); } | |
136 | ||
137 | Iterator & base() | |
138 | { return m_it; } | |
139 | ||
140 | const Iterator & base() const | |
141 | { return m_it; } | |
142 | ||
143 | private: | |
144 | Iterator m_it; | |
145 | ||
146 | void increment() | |
147 | { ++m_it; } | |
148 | ||
149 | void decrement() | |
150 | { --m_it; } | |
151 | ||
152 | bool equal(const transform_iterator &other) const | |
153 | { return m_it == other.m_it; } | |
154 | ||
155 | bool less(const transform_iterator &other) const | |
156 | { return other.m_it < m_it; } | |
157 | ||
158 | typename UnaryFunction::result_type dereference() const | |
159 | { return UnaryFunction::operator()(*m_it); } | |
160 | ||
161 | void advance(typename Iterator::difference_type n) | |
162 | { boost::container::iterator_advance(m_it, n); } | |
163 | ||
164 | typename Iterator::difference_type distance_to(const transform_iterator &other)const | |
165 | { return boost::container::iterator_distance(other.m_it, m_it); } | |
166 | }; | |
167 | ||
168 | template <class Iterator, class UnaryFunc> | |
169 | transform_iterator<Iterator, UnaryFunc> | |
170 | make_transform_iterator(Iterator it, UnaryFunc fun) | |
171 | { | |
172 | return transform_iterator<Iterator, UnaryFunc>(it, fun); | |
173 | } | |
174 | ||
175 | } //namespace container { | |
176 | } //namespace boost { | |
177 | ||
178 | #include <boost/container/detail/config_end.hpp> | |
179 | ||
180 | #endif //#ifndef BOOST_CONTAINER_DETAIL_TRANSFORM_ITERATORS_HPP |