[Haskell-cafe] typeclass question
waldmann at imn.htwk-leipzig.de
Thu Sep 11 06:24:32 EDT 2008
> | class ToRenderable a b where
> | toRenderable :: a -> Renderable b
> But the above is, I think, too general for my needs. I don't want
> to be able to generate Renderables of different type b for a single input
> type a.
Sounds like a functional dependency (class ToReadable a b | a -> b )
> Also, MPTC take me out of the world of haskell 98, which I was trying
> to avoid.
Why. "Everyone does it",
and MPTC will be in Haskell-Prime (but FD may be not)
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 257 bytes
Desc: OpenPGP digital signature
Url : http://www.haskell.org/pipermail/haskell-cafe/attachments/20080911/57b3d245/signature.bin
More information about the Haskell-Cafe