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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
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