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1 | ////////////////////////////////////////////////////////////////////////////// |
2 | // | |
3 | // (C) Copyright Ion Gaztanaga 2005-2015. | |
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/interprocess for documentation. | |
11 | // | |
12 | ////////////////////////////////////////////////////////////////////////////// | |
13 | ||
14 | #ifndef BOOST_INTERPROCESS_DETAIL_TRANSFORM_ITERATORS_HPP | |
15 | #define BOOST_INTERPROCESS_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/interprocess/detail/config_begin.hpp> | |
26 | #include <boost/interprocess/detail/workaround.hpp> | |
27 | ||
28 | // interprocess | |
29 | #include <boost/interprocess/interprocess_fwd.hpp> | |
30 | // interprocess/detail | |
31 | #include <boost/interprocess/detail/type_traits.hpp> | |
32 | // move/detail | |
33 | #include <boost/container/detail/iterator.hpp> | |
34 | ||
35 | namespace boost { | |
36 | namespace interprocess { | |
37 | ||
38 | template <class PseudoReference> | |
39 | struct operator_arrow_proxy | |
40 | { | |
41 | operator_arrow_proxy(const PseudoReference &px) | |
42 | : m_value(px) | |
43 | {} | |
44 | ||
45 | PseudoReference* operator->() const { return &m_value; } | |
46 | // This function is needed for MWCW and BCC, which won't call operator-> | |
47 | // again automatically per 13.3.1.2 para 8 | |
48 | // operator T*() const { return &m_value; } | |
49 | mutable PseudoReference m_value; | |
50 | }; | |
51 | ||
52 | template <class T> | |
53 | struct operator_arrow_proxy<T&> | |
54 | { | |
55 | operator_arrow_proxy(T &px) | |
56 | : m_value(px) | |
57 | {} | |
58 | ||
59 | T* operator->() const { return const_cast<T*>(&m_value); } | |
60 | // This function is needed for MWCW and BCC, which won't call operator-> | |
61 | // again automatically per 13.3.1.2 para 8 | |
62 | // operator T*() const { return &m_value; } | |
63 | T &m_value; | |
64 | }; | |
65 | ||
66 | template <class Iterator, class UnaryFunction> | |
67 | class transform_iterator | |
68 | : public UnaryFunction | |
69 | { | |
70 | public: | |
71 | typedef typename ::boost::container::iterator_traits<Iterator>::iterator_category iterator_category; | |
72 | typedef typename ipcdetail::remove_reference<typename UnaryFunction::result_type>::type value_type; | |
73 | typedef typename ::boost::container::iterator_traits<Iterator>::difference_type difference_type; | |
74 | typedef operator_arrow_proxy<typename UnaryFunction::result_type> pointer; | |
75 | typedef typename UnaryFunction::result_type reference; | |
76 | ||
77 | explicit transform_iterator(const Iterator &it, const UnaryFunction &f = UnaryFunction()) | |
78 | : UnaryFunction(f), m_it(it) | |
79 | {} | |
80 | ||
81 | explicit transform_iterator() | |
82 | : UnaryFunction(), m_it() | |
83 | {} | |
84 | ||
85 | //Constructors | |
86 | transform_iterator& operator++() | |
87 | { increment(); return *this; } | |
88 | ||
89 | transform_iterator operator++(int) | |
90 | { | |
91 | transform_iterator result (*this); | |
92 | increment(); | |
93 | return result; | |
94 | } | |
95 | ||
96 | transform_iterator& operator--() | |
97 | { decrement(); return *this; } | |
98 | ||
99 | transform_iterator operator--(int) | |
100 | { | |
101 | transform_iterator result (*this); | |
102 | decrement(); | |
103 | return result; | |
104 | } | |
105 | ||
106 | friend bool operator== (const transform_iterator& i, const transform_iterator& i2) | |
107 | { return i.equal(i2); } | |
108 | ||
109 | friend bool operator!= (const transform_iterator& i, const transform_iterator& i2) | |
110 | { return !(i == i2); } | |
111 | ||
112 | friend bool operator< (const transform_iterator& i, const transform_iterator& i2) | |
113 | { return i < i2; } | |
114 | ||
115 | friend bool operator> (const transform_iterator& i, const transform_iterator& i2) | |
116 | { return i2 < i; } | |
117 | ||
118 | friend bool operator<= (const transform_iterator& i, const transform_iterator& i2) | |
119 | { return !(i > i2); } | |
120 | ||
121 | friend bool operator>= (const transform_iterator& i, const transform_iterator& i2) | |
122 | { return !(i < i2); } | |
123 | ||
124 | friend difference_type operator- (const transform_iterator& i, const transform_iterator& i2) | |
125 | { return i2.distance_to(i); } | |
126 | ||
127 | //Arithmetic | |
128 | transform_iterator& operator+=(difference_type off) | |
129 | { this->advance(off); return *this; } | |
130 | ||
131 | transform_iterator operator+(difference_type off) const | |
132 | { | |
133 | transform_iterator other(*this); | |
134 | other.advance(off); | |
135 | return other; | |
136 | } | |
137 | ||
138 | friend transform_iterator operator+(difference_type off, const transform_iterator& right) | |
139 | { return right + off; } | |
140 | ||
141 | transform_iterator& operator-=(difference_type off) | |
142 | { this->advance(-off); return *this; } | |
143 | ||
144 | transform_iterator operator-(difference_type off) const | |
145 | { return *this + (-off); } | |
146 | ||
147 | typename UnaryFunction::result_type operator*() const | |
148 | { return dereference(); } | |
149 | ||
150 | typename UnaryFunction::result_type operator[](difference_type off) const | |
151 | { return UnaryFunction::operator()(m_it[off]); } | |
152 | ||
153 | operator_arrow_proxy<typename UnaryFunction::result_type> | |
154 | operator->() const | |
155 | { return operator_arrow_proxy<typename UnaryFunction::result_type>(dereference()); } | |
156 | ||
157 | Iterator & base() | |
158 | { return m_it; } | |
159 | ||
160 | const Iterator & base() const | |
161 | { return m_it; } | |
162 | ||
163 | private: | |
164 | Iterator m_it; | |
165 | ||
166 | void increment() | |
167 | { ++m_it; } | |
168 | ||
169 | void decrement() | |
170 | { --m_it; } | |
171 | ||
172 | bool equal(const transform_iterator &other) const | |
173 | { return m_it == other.m_it; } | |
174 | ||
175 | bool less(const transform_iterator &other) const | |
176 | { return other.m_it < m_it; } | |
177 | ||
178 | typename UnaryFunction::result_type dereference() const | |
179 | { return UnaryFunction::operator()(*m_it); } | |
180 | ||
181 | void advance(difference_type n) | |
182 | { ::boost::container::iterator_advance(m_it, n); } | |
183 | ||
184 | difference_type distance_to(const transform_iterator &other)const | |
185 | { return ::boost::container::iterator_distance(other.m_it, m_it); } | |
186 | }; | |
187 | ||
188 | template <class Iterator, class UnaryFunc> | |
189 | transform_iterator<Iterator, UnaryFunc> | |
190 | make_transform_iterator(Iterator it, UnaryFunc fun) | |
191 | { | |
192 | return transform_iterator<Iterator, UnaryFunc>(it, fun); | |
193 | } | |
194 | ||
195 | } //namespace interprocess { | |
196 | } //namespace boost { | |
197 | ||
198 | #include <boost/interprocess/detail/config_end.hpp> | |
199 | ||
200 | #endif //#ifndef BOOST_INTERPROCESS_DETAIL_TRANSFORM_ITERATORS_HPP |