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### ip::multicast::enable_loopback

Socket option determining whether outgoing multicast packets will be received on the same socket if it is a member of the multicast group.

    typedef implementation_defined enable_loopback;

Implements the IPPROTO_IP/IP_MULTICAST_LOOP socket option.

##### Examples

Setting the option:

    boost::asio::ip::udp::socket socket(io_service);
    ...
    boost::asio::ip::multicast::enable_loopback option(true);
    socket.set_option(option);

Getting the current option value:

    boost::asio::ip::udp::socket socket(io_service);
    ...
    boost::asio::ip::multicast::enable_loopback option;
    socket.get_option(option);
    bool is_set = option.value();