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//
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// ip/v6_only.hpp
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// ~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_ASIO_IP_V6_ONLY_HPP
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#define BOOST_ASIO_IP_V6_ONLY_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include <boost/asio/detail/config.hpp>
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#include <boost/asio/detail/socket_option.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace ip {
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/// Socket option for determining whether an IPv6 socket supports IPv6
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/// communication only.
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/**
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 * Implements the IPPROTO_IPV6/IP_V6ONLY socket option.
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 *
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 * @par Examples
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 * Setting the option:
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 * @code
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 * boost::asio::ip::tcp::socket socket(io_service); 
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 * ...
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 * boost::asio::ip::v6_only option(true);
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 * socket.set_option(option);
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 * @endcode
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 *
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 * @par
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 * Getting the current option value:
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 * @code
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 * boost::asio::ip::tcp::socket socket(io_service); 
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 * ...
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 * boost::asio::ip::v6_only option;
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 * socket.get_option(option);
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 * bool v6_only = option.value();
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 * @endcode
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 *
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 * @par Concepts:
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 * GettableSocketOption, SettableSocketOption.
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 */
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#if defined(GENERATING_DOCUMENTATION)
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typedef implementation_defined v6_only;
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#elif defined(IPV6_V6ONLY)
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typedef boost::asio::detail::socket_option::boolean<
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    IPPROTO_IPV6, IPV6_V6ONLY> v6_only;
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#else
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typedef boost::asio::detail::socket_option::boolean<
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    boost::asio::detail::custom_socket_option_level,
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    boost::asio::detail::always_fail_option> v6_only;
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#endif
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} // namespace ip
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // BOOST_ASIO_IP_V6_ONLY_HPP