Re: [Haskell-cafe] Writing guards shorthand

Hi isBool x = isLT x || isGT x isNum x = not $ isBool x isLT and isGT can be derived automatically using derve [1], with the Is class (or DrIFT if you want). Thanks Neil [1] google "data derive" On 4/19/07, Joel Reymont wrote:

Support I want to infer the type given an Op that looks like this (incomplete):

data Op = Minus | Plus | Mul | LT | GT

Is there a shorthand way of bunching Minus, Plus and Mul in a function guard since they all result in TyNum whereas the rest in TyBool?

I really don't want several function clauses and neither do I want separate guards for every constructor.

Thanks, Joel

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