basic_socket::set_option (1 of 2 overloads)

Set an option on the socket.

template<
    typename SettableSocketOption>
void set_option(
    const SettableSocketOption & option);

This function is used to set an option on the socket.

Setting the IPPROTO_TCP/TCP_NODELAY option:

boost::asio::ip::tcp::socket socket(io_service);
...
boost::asio::ip::tcp::no_delay option(true);
socket.set_option(option);