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### ip::multicast::join_group

Socket option to join a multicast group on a specified interface.

    typedef implementation_defined join_group;

Implements the IPPROTO_IP/IP_ADD_MEMBERSHIP socket option.

##### Examples

Setting the option to join a multicast group:

    boost::asio::ip::udp::socket socket(io_service);
    ...
    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);