class type client_socket_connector =This class type provides engines to connect to a service. In order to get and activate such an engine, callobject..end
connect.method connect : connect_address ->
Unixqueue.event_system -> connect_status engineconnect_address argument. If successful, the state of the engine
changes to `Done(status) where status contains the socket
details. The connection is established in the background.
If the connect address is `Socket, the returned status will be
`Socket;
If the address is `Command, the returned status will be `Command.
The close-on-exec flag of the created socket descriptor is always set.
The socket descriptor is always in non-blocking mode.
