//

// v6_only.hpp

// ~~~~~~~~~~~

//

// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff 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 BOOST_ASIO_IP_V6_ONLY_HPP

#define BOOST_ASIO_IP_V6_ONLY_HPP



#if defined(_MSC_VER) && (_MSC_VER >= 1200)

# pragma once

#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)



#include <boost/asio/detail/push_options.hpp>



#include <boost/asio/detail/socket_option.hpp>



namespace boost {

namespace asio {

namespace ip {



/// Socket option for determining whether an IPv6 socket supports IPv6

/// communication only.

/**

 * Implements the IPPROTO_IPV6/IP_V6ONLY socket option.

 *

 * @par Examples

 * Setting the option:

 * @code

 * boost::asio::ip::tcp::socket socket(io_service); 

 * ...

 * boost::asio::ip::v6_only option(true);

 * socket.set_option(option);

 * @endcode

 *

 * @par

 * Getting the current option value:

 * @code

 * boost::asio::ip::tcp::socket socket(io_service); 

 * ...

 * boost::asio::ip::v6_only option;

 * socket.get_option(option);

 * bool v6_only = option.value();

 * @endcode

 *

 * @par Concepts:

 * GettableSocketOption, SettableSocketOption.

 */

#if defined(GENERATING_DOCUMENTATION)

typedef implementation_defined v6_only;

#elif defined(IPV6_V6ONLY)

typedef boost::asio::detail::socket_option::boolean<

    IPPROTO_IPV6, IPV6_V6ONLY> v6_only;

#else

typedef boost::asio::detail::socket_option::boolean<

    boost::asio::detail::custom_socket_option_level,

    boost::asio::detail::always_fail_option> v6_only;

#endif



} // namespace ip

} // namespace asio

} // namespace boost



#include <boost/asio/detail/pop_options.hpp>



#endif // BOOST_ASIO_IP_V6_ONLY_HPP

