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+//
+// ip/address_v6_iterator.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Oliver Kowalke (oliver dot kowalke at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_ADDRESS_V6_ITERATOR_HPP
+#define ASIO_IP_ADDRESS_V6_ITERATOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/ip/address_v6.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ip {
+
+template <typename> class basic_address_iterator;
+
+/// An input iterator that can be used for traversing IPv6 addresses.
+/**
+ * In addition to satisfying the input iterator requirements, this iterator
+ * also supports decrement.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <> class basic_address_iterator<address_v6>
+{
+public:
+ /// The type of the elements pointed to by the iterator.
+ typedef address_v6 value_type;
+
+ /// Distance between two iterators.
+ typedef std::ptrdiff_t difference_type;
+
+ /// The type of a pointer to an element pointed to by the iterator.
+ typedef const address_v6* pointer;
+
+ /// The type of a reference to an element pointed to by the iterator.
+ typedef const address_v6& reference;
+
+ /// Denotes that the iterator satisfies the input iterator requirements.
+ typedef std::input_iterator_tag iterator_category;
+
+ /// Construct an iterator that points to the specified address.
+ basic_address_iterator(const address_v6& addr) ASIO_NOEXCEPT
+ : address_(addr)
+ {
+ }
+
+ /// Copy constructor.
+ basic_address_iterator(
+ const basic_address_iterator& other) ASIO_NOEXCEPT
+ : address_(other.address_)
+ {
+ }
+
+#if defined(ASIO_HAS_MOVE)
+ /// Move constructor.
+ basic_address_iterator(basic_address_iterator&& other) ASIO_NOEXCEPT
+ : address_(ASIO_MOVE_CAST(address_v6)(other.address_))
+ {
+ }
+#endif // defined(ASIO_HAS_MOVE)
+
+ /// Assignment operator.
+ basic_address_iterator& operator=(
+ const basic_address_iterator& other) ASIO_NOEXCEPT
+ {
+ address_ = other.address_;
+ return *this;
+ }
+
+#if defined(ASIO_HAS_MOVE)
+ /// Move assignment operator.
+ basic_address_iterator& operator=(
+ basic_address_iterator&& other) ASIO_NOEXCEPT
+ {
+ address_ = ASIO_MOVE_CAST(address_v6)(other.address_);
+ return *this;
+ }
+#endif // defined(ASIO_HAS_MOVE)
+
+ /// Dereference the iterator.
+ const address_v6& operator*() const ASIO_NOEXCEPT
+ {
+ return address_;
+ }
+
+ /// Dereference the iterator.
+ const address_v6* operator->() const ASIO_NOEXCEPT
+ {
+ return &address_;
+ }
+
+ /// Pre-increment operator.
+ basic_address_iterator& operator++() ASIO_NOEXCEPT
+ {
+ for (int i = 15; i >= 0; --i)
+ {
+ if (address_.addr_.s6_addr[i] < 0xFF)
+ {
+ ++address_.addr_.s6_addr[i];
+ break;
+ }
+
+ address_.addr_.s6_addr[i] = 0;
+ }
+
+ return *this;
+ }
+
+ /// Post-increment operator.
+ basic_address_iterator operator++(int) ASIO_NOEXCEPT
+ {
+ basic_address_iterator tmp(*this);
+ ++*this;
+ return tmp;
+ }
+
+ /// Pre-decrement operator.
+ basic_address_iterator& operator--() ASIO_NOEXCEPT
+ {
+ for (int i = 15; i >= 0; --i)
+ {
+ if (address_.addr_.s6_addr[i] > 0)
+ {
+ --address_.addr_.s6_addr[i];
+ break;
+ }
+
+ address_.addr_.s6_addr[i] = 0xFF;
+ }
+
+ return *this;
+ }
+
+ /// Post-decrement operator.
+ basic_address_iterator operator--(int)
+ {
+ basic_address_iterator tmp(*this);
+ --*this;
+ return tmp;
+ }
+
+ /// Compare two addresses for equality.
+ friend bool operator==(const basic_address_iterator& a,
+ const basic_address_iterator& b)
+ {
+ return a.address_ == b.address_;
+ }
+
+ /// Compare two addresses for inequality.
+ friend bool operator!=(const basic_address_iterator& a,
+ const basic_address_iterator& b)
+ {
+ return a.address_ != b.address_;
+ }
+
+private:
+ address_v6 address_;
+};
+
+/// An input iterator that can be used for traversing IPv6 addresses.
+typedef basic_address_iterator<address_v6> address_v6_iterator;
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_ADDRESS_V6_ITERATOR_HPP