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Socket option for local interface to use for outgoing multicast packets.
typedef implementation_defined outbound_interface;
Implements the IPPROTO_IP/IP_MULTICAST_IF socket option.
Setting the option:
asio::ip::udp::socket socket(io_context);
...
asio::ip::address_v4 local_interface =
asio::ip::address_v4::from_string("1.2.3.4");
asio::ip::multicast::outbound_interface option(local_interface);
socket.set_option(option);
Header: asio/ip/multicast.hpp
Convenience header: asio.hpp