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1 | // |
2 | // ip/address_v6_iterator.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
92f5a8d4 | 5 | // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
b32b8144 FG |
6 | // Oliver Kowalke (oliver dot kowalke at gmail dot com) |
7 | // | |
8 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
9 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
10 | // | |
11 | ||
12 | #ifndef BOOST_ASIO_IP_ADDRESS_V6_ITERATOR_HPP | |
13 | #define BOOST_ASIO_IP_ADDRESS_V6_ITERATOR_HPP | |
14 | ||
15 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
16 | # pragma once | |
17 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
18 | ||
19 | #include <boost/asio/detail/config.hpp> | |
20 | #include <boost/asio/ip/address_v6.hpp> | |
21 | ||
22 | #include <boost/asio/detail/push_options.hpp> | |
23 | ||
24 | namespace boost { | |
25 | namespace asio { | |
26 | namespace ip { | |
27 | ||
28 | template <typename> class basic_address_iterator; | |
29 | ||
30 | /// An input iterator that can be used for traversing IPv6 addresses. | |
31 | /** | |
32 | * In addition to satisfying the input iterator requirements, this iterator | |
33 | * also supports decrement. | |
34 | * | |
35 | * @par Thread Safety | |
36 | * @e Distinct @e objects: Safe.@n | |
37 | * @e Shared @e objects: Unsafe. | |
38 | */ | |
39 | template <> class basic_address_iterator<address_v6> | |
40 | { | |
41 | public: | |
42 | /// The type of the elements pointed to by the iterator. | |
43 | typedef address_v6 value_type; | |
44 | ||
45 | /// Distance between two iterators. | |
46 | typedef std::ptrdiff_t difference_type; | |
47 | ||
48 | /// The type of a pointer to an element pointed to by the iterator. | |
49 | typedef const address_v6* pointer; | |
50 | ||
51 | /// The type of a reference to an element pointed to by the iterator. | |
52 | typedef const address_v6& reference; | |
53 | ||
54 | /// Denotes that the iterator satisfies the input iterator requirements. | |
55 | typedef std::input_iterator_tag iterator_category; | |
56 | ||
57 | /// Construct an iterator that points to the specified address. | |
58 | basic_address_iterator(const address_v6& addr) BOOST_ASIO_NOEXCEPT | |
59 | : address_(addr) | |
60 | { | |
61 | } | |
62 | ||
63 | /// Copy constructor. | |
64 | basic_address_iterator( | |
65 | const basic_address_iterator& other) BOOST_ASIO_NOEXCEPT | |
66 | : address_(other.address_) | |
67 | { | |
68 | } | |
69 | ||
70 | #if defined(BOOST_ASIO_HAS_MOVE) | |
71 | /// Move constructor. | |
72 | basic_address_iterator(basic_address_iterator&& other) BOOST_ASIO_NOEXCEPT | |
73 | : address_(BOOST_ASIO_MOVE_CAST(address_v6)(other.address_)) | |
74 | { | |
75 | } | |
76 | #endif // defined(BOOST_ASIO_HAS_MOVE) | |
77 | ||
78 | /// Assignment operator. | |
79 | basic_address_iterator& operator=( | |
80 | const basic_address_iterator& other) BOOST_ASIO_NOEXCEPT | |
81 | { | |
82 | address_ = other.address_; | |
83 | return *this; | |
84 | } | |
85 | ||
86 | #if defined(BOOST_ASIO_HAS_MOVE) | |
87 | /// Move assignment operator. | |
88 | basic_address_iterator& operator=( | |
89 | basic_address_iterator&& other) BOOST_ASIO_NOEXCEPT | |
90 | { | |
91 | address_ = BOOST_ASIO_MOVE_CAST(address_v6)(other.address_); | |
92 | return *this; | |
93 | } | |
94 | #endif // defined(BOOST_ASIO_HAS_MOVE) | |
95 | ||
96 | /// Dereference the iterator. | |
97 | const address_v6& operator*() const BOOST_ASIO_NOEXCEPT | |
98 | { | |
99 | return address_; | |
100 | } | |
101 | ||
102 | /// Dereference the iterator. | |
103 | const address_v6* operator->() const BOOST_ASIO_NOEXCEPT | |
104 | { | |
105 | return &address_; | |
106 | } | |
107 | ||
108 | /// Pre-increment operator. | |
109 | basic_address_iterator& operator++() BOOST_ASIO_NOEXCEPT | |
110 | { | |
111 | for (int i = 15; i >= 0; --i) | |
112 | { | |
113 | if (address_.addr_.s6_addr[i] < 0xFF) | |
114 | { | |
115 | ++address_.addr_.s6_addr[i]; | |
116 | break; | |
117 | } | |
118 | ||
119 | address_.addr_.s6_addr[i] = 0; | |
120 | } | |
121 | ||
122 | return *this; | |
123 | } | |
124 | ||
125 | /// Post-increment operator. | |
126 | basic_address_iterator operator++(int) BOOST_ASIO_NOEXCEPT | |
127 | { | |
128 | basic_address_iterator tmp(*this); | |
129 | ++*this; | |
130 | return tmp; | |
131 | } | |
132 | ||
133 | /// Pre-decrement operator. | |
134 | basic_address_iterator& operator--() BOOST_ASIO_NOEXCEPT | |
135 | { | |
136 | for (int i = 15; i >= 0; --i) | |
137 | { | |
138 | if (address_.addr_.s6_addr[i] > 0) | |
139 | { | |
140 | --address_.addr_.s6_addr[i]; | |
141 | break; | |
142 | } | |
143 | ||
144 | address_.addr_.s6_addr[i] = 0xFF; | |
145 | } | |
146 | ||
147 | return *this; | |
148 | } | |
149 | ||
150 | /// Post-decrement operator. | |
151 | basic_address_iterator operator--(int) | |
152 | { | |
153 | basic_address_iterator tmp(*this); | |
154 | --*this; | |
155 | return tmp; | |
156 | } | |
157 | ||
158 | /// Compare two addresses for equality. | |
159 | friend bool operator==(const basic_address_iterator& a, | |
160 | const basic_address_iterator& b) | |
161 | { | |
162 | return a.address_ == b.address_; | |
163 | } | |
164 | ||
165 | /// Compare two addresses for inequality. | |
166 | friend bool operator!=(const basic_address_iterator& a, | |
167 | const basic_address_iterator& b) | |
168 | { | |
169 | return a.address_ != b.address_; | |
170 | } | |
171 | ||
172 | private: | |
173 | address_v6 address_; | |
174 | }; | |
175 | ||
176 | /// An input iterator that can be used for traversing IPv6 addresses. | |
177 | typedef basic_address_iterator<address_v6> address_v6_iterator; | |
178 | ||
179 | } // namespace ip | |
180 | } // namespace asio | |
181 | } // namespace boost | |
182 | ||
183 | #include <boost/asio/detail/pop_options.hpp> | |
184 | ||
185 | #endif // BOOST_ASIO_IP_ADDRESS_V6_ITERATOR_HPP |