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							- //
 - // ip/v6_only.hpp
 - // ~~~~~~~~~~~~~~
 - //
 - // Copyright (c) 2003-2019 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 ASIO_IP_V6_ONLY_HPP
 - #define ASIO_IP_V6_ONLY_HPP
 - 
 - #if defined(_MSC_VER) && (_MSC_VER >= 1200)
 - # pragma once
 - #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 - 
 - #include "asio/detail/config.hpp"
 - #include "asio/detail/socket_option.hpp"
 - 
 - #include "asio/detail/push_options.hpp"
 - 
 - 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
 -  * asio::ip::tcp::socket socket(my_context);
 -  * ...
 -  * asio::ip::v6_only option(true);
 -  * socket.set_option(option);
 -  * @endcode
 -  *
 -  * @par
 -  * Getting the current option value:
 -  * @code
 -  * asio::ip::tcp::socket socket(my_context);
 -  * ...
 -  * 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 asio::detail::socket_option::boolean<
 -     IPPROTO_IPV6, IPV6_V6ONLY> v6_only;
 - #else
 - typedef asio::detail::socket_option::boolean<
 -     asio::detail::custom_socket_option_level,
 -     asio::detail::always_fail_option> v6_only;
 - #endif
 - 
 - } // namespace ip
 - } // namespace asio
 - 
 - #include "asio/detail/pop_options.hpp"
 - 
 - #endif // ASIO_IP_V6_ONLY_HPP
 
 
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