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#### socket_base::keep_alive

Socket option to send keep-alives.

    typedef implementation_defined keep_alive;

Implements the SOL_SOCKET/SO_KEEPALIVE socket option.

###### Examples

Setting the option:

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

Getting the current option value:

    boost::asio::ip::tcp::socket socket(io_service);
    ...
    boost::asio::socket_base::keep_alive option;
    socket.get_option(option);
    bool is_set = option.value();