Sorry, I've just worked it out.
PortNumber is an instance of the class Enum so we can use toEnum :: Int -> a Tom On Tue, 3 Jun 2003 05:25 pm, Thomas L. Bevan wrote: > Hi, > > 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. > > Tom > > > _______________________________________________ > Haskell-Cafe mailing list > [EMAIL PROTECTED] > http://www.haskell.org/mailman/listinfo/haskell-cafe _______________________________________________ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
