text: //
  // ip/multicast.hpp
  // ~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2018 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_MULTICAST_HPP
  #define BOOST_ASIO_IP_MULTICAST_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include <boost/asio/detail/config.hpp>
  #include <cstddef>
  #include <boost/asio/ip/detail/socket_option.hpp>
  
  #include <boost/asio/detail/push_options.hpp>
  
  namespace boost {
  namespace asio {
  namespace ip {
  namespace multicast {
  
  /// Socket option to join a multicast group on a specified interface.
  /**
   * Implements the IPPROTO_IP/IP_ADD_MEMBERSHIP socket option.
   *
   * @par Examples
   * Setting the option to join a multicast group:
   * @code
   * boost::asio::ip::udp::socket socket(io_context); 
   * ...
   * boost::asio::ip::address multicast_address =
   *   boost::asio::ip::address::from_string("225.0.0.1");
   * boost::asio::ip::multicast::join_group option(multicast_address);
   * socket.set_option(option);
   * @endcode
   *
   * @par Concepts:
   * SettableSocketOption.
   */
  #if defined(GENERATING_DOCUMENTATION)
  typedef implementation_defined join_group;
  #else
  typedef boost::asio::ip::detail::socket_option::multicast_request<
    BOOST_ASIO_OS_DEF(IPPROTO_IP),
    BOOST_ASIO_OS_DEF(IP_ADD_MEMBERSHIP),
    BOOST_ASIO_OS_DEF(IPPROTO_IPV6),
    BOOST_ASIO_OS_DEF(IPV6_JOIN_GROUP)> join_group;
  #endif
  
  /// Socket option to leave a multicast group on a specified interface.
  /**
   * Implements the IPPROTO_IP/IP_DROP_MEMBERSHIP socket option.
   *
   * @par Examples
   * Setting the option to leave a multicast group:
   * @code
   * boost::asio::ip::udp::socket socket(io_context); 
   * ...
   * boost::asio::ip::address multicast_address =
   *   boost::asio::ip::address::from_string("225.0.0.1");
   * boost::asio::ip::multicast::leave_group option(multicast_address);
   * socket.set_option(option);
   * @endcode
   *
   * @par Concepts:
   * SettableSocketOption.
   */
  #if defined(GENERATING_DOCUMENTATION)
  typedef implementation_defined leave_group;
  #else
  typedef boost::asio::ip::detail::socket_option::multicast_request<
    BOOST_ASIO_OS_DEF(IPPROTO_IP),
    BOOST_ASIO_OS_DEF(IP_DROP_MEMBERSHIP),
    BOOST_ASIO_OS_DEF(IPPROTO_IPV6),
    BOOST_ASIO_OS_DEF(IPV6_LEAVE_GROUP)> leave_group;
  #endif
  
  /// Socket option for local interface to use for outgoing multicast packets.
  /**
   * Implements the IPPROTO_IP/IP_MULTICAST_IF socket option.
   *
   * @par Examples
   * Setting the option:
   * @code
   * boost::asio::ip::udp::socket socket(io_context); 
   * ...
   * boost::asio::ip::address_v4 local_interface =
   *   boost::asio::ip::address_v4::from_string("1.2.3.4");
   * boost::asio::ip::multicast::outbound_interface option(local_interface);
   * socket.set_option(option);
   * @endcode
   *
   * @par Concepts:
   * SettableSocketOption.
   */
  #if defined(GENERATING_DOCUMENTATION)
  typedef implementation_defined outbound_interface;
  #else
  typedef boost::asio::ip::detail::socket_option::network_interface<
    BOOST_ASIO_OS_DEF(IPPROTO_IP),
    BOOST_ASIO_OS_DEF(IP_MULTICAST_IF),
    BOOST_ASIO_OS_DEF(IPPROTO_IPV6),
    BOOST_ASIO_OS_DEF(IPV6_MULTICAST_IF)> outbound_interface;
  #endif
  
  /// Socket option for time-to-live associated with outgoing multicast packets.
  /**
   * Implements the IPPROTO_IP/IP_MULTICAST_TTL socket option.
   *
   * @par Examples
   * Setting the option:
   * @code
   * boost::asio::ip::udp::socket socket(io_context); 
   * ...
   * boost::asio::ip::multicast::hops option(4);
   * socket.set_option(option);
   * @endcode
   *
   * @par
   * Getting the current option value:
   * @code
   * boost::asio::ip::udp::socket socket(io_context); 
   * ...
   * boost::asio::ip::multicast::hops option;
   * socket.get_option(option);
   * int ttl = option.value();
   * @endcode
   *
   * @par Concepts:
   * GettableSocketOption, SettableSocketOption.
   */
  #if defined(GENERATING_DOCUMENTATION)
  typedef implementation_defined hops;
  #else
  typedef boost::asio::ip::detail::socket_option::multicast_hops<
    BOOST_ASIO_OS_DEF(IPPROTO_IP),
    BOOST_ASIO_OS_DEF(IP_MULTICAST_TTL),
    BOOST_ASIO_OS_DEF(IPPROTO_IPV6),
    BOOST_ASIO_OS_DEF(IPV6_MULTICAST_HOPS)> hops;
  #endif
  
  /// Socket option determining whether outgoing multicast packets will be
  /// received on the same socket if it is a member of the multicast group.
  /**
   * Implements the IPPROTO_IP/IP_MULTICAST_LOOP socket option.
   *
   * @par Examples
   * Setting the option:
   * @code
   * boost::asio::ip::udp::socket socket(io_context); 
   * ...
   * boost::asio::ip::multicast::enable_loopback option(true);
   * socket.set_option(option);
   * @endcode
   *
   * @par
   * Getting the current option value:
   * @code
   * boost::asio::ip::udp::socket socket(io_context); 
   * ...
   * boost::asio::ip::multicast::enable_loopback option;
   * socket.get_option(option);
   * bool is_set = option.value();
   * @endcode
   *
   * @par Concepts:
   * GettableSocketOption, SettableSocketOption.
   */
  #if defined(GENERATING_DOCUMENTATION)
  typedef implementation_defined enable_loopback;
  #else
  typedef boost::asio::ip::detail::socket_option::multicast_enable_loopback<
    BOOST_ASIO_OS_DEF(IPPROTO_IP),
    BOOST_ASIO_OS_DEF(IP_MULTICAST_LOOP),
    BOOST_ASIO_OS_DEF(IPPROTO_IPV6),
    BOOST_ASIO_OS_DEF(IPV6_MULTICAST_LOOP)> enable_loopback;
  #endif
  
  } // namespace multicast
  } // namespace ip
  } // namespace asio
  } // namespace boost
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // BOOST_ASIO_IP_MULTICAST_HPP
  