| Home | Libraries | People | FAQ | More

### ip::multicast::hops

Socket option for time-to-live associated with outgoing multicast packets.

    typedef implementation_defined hops;

Implements the IPPROTO_IP/IP_MULTICAST_TTL socket option.

##### Examples

Setting the option:

    boost::asio::ip::udp::socket socket(io_service);
    ...
    boost::asio::ip::multicast::hops option(4);
    socket.set_option(option);

Getting the current option value:

    boost::asio::ip::udp::socket socket(io_service);
    ...
    boost::asio::ip::multicast::hops option;
    socket.get_option(option);
    int ttl = option.value();

##### Requirements

Header: `boost/asio/ip/multicast.hpp`

Convenience header: `boost/asio.hpp`