Networking : PortNumber

Thomas L. Bevan
Tue, 3 Jun 2003 17:25:27 +1000


How can I take some input and convert this into a
PortID ? 
I don't quite understand why the constructor
PortNumber doesn't have the signature

PortID = PortNumber Int | ...

Instead it is 

PortID = PortNumber PortNumber

where PortNumber is not a member of the Read class.