27 Jun
2002
27 Jun
'02
10:09 a.m.
Jon Fairbairn <Jon.Fairbairn@cl.cam.ac.uk> writes:
data Port = Tcpmux | Nbp | Echo_ddp | Rje | Zip | Echo_tcp | ... deriving Enum, ... instance Num Port where ...
Or, alternatively, just use Strings, and have a portFromString first check /etc/services for a match, then try to parse the string as a positive integer, and finally generate an error if no valid port can be determined?
Possibly, if there's really no way of making sure the error happens at compile time. -- Jón Fairbairn Jon.Fairbairn@cl.cam.ac.uk 31 Chalmers Road jf@cl.cam.ac.uk Cambridge CB1 3SZ +44 1223 570179 (after 14:00 only, please!)