[Haskell-cafe] Re: Re: type class question
jules at jellybean.co.uk
Fri Dec 7 07:43:25 EST 2007
Peter Padawitz wrote:
> Functional dependencies don't work in my case. Actually, I don't see why
> they should.
Ah well, it's cruel to say that without explaining to us why!
I'm not sure why a complete cyclic dep a -> b -> c -> d -> a isn't what
> What seems to be needed here is a type class construct with a kind of
> record parameter so that instance conflicts cannot occur.
I'm not entirely sure what you intend to mean by this, but if you mean
what I guess you mean:
class Java (a,b,c,d) where ....
then I think that would appear to be the same thing as a complete cyclic
fundep to me...
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