17 Dec
2009
17 Dec
'09
1:56 p.m.
On Dec 17, 2009, at 12:21 , kane96@gmx.de wrote:
toEnum should return Z for negative numbers. I did something like this but the problem is I don't know how to set "less than". I tried
and lt:
instance Enum Nat where toEnum (gt 0) = S Z toEnum (lt 1) = Z
Take a look at guards. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH