[Haskell] class variable dynamic inference
hpacheco at gmail.com
Thu Jun 14 17:43:01 EDT 2007
I have defined some functors (with respective Functor instances) and a
class that derives the equivalent non-functor representation
class (Functor f) => Rep f a b | f a -> b
My problem is that I need to define another class
class (Functor f,Rep f d c) => FunctorOf f d | d -> f where
in'' :: c -> d
out'' :: d -> c
where the variable c would be implicit and dynamically derived from
the (f d) context.
Of course this is not allowed as long as the variable c is not in the
Is there any way I can hack this around?
defining the class functions like in'' :: Rep f d c => c -> d doesn't
solve my problem as well.
Thanks in advance,
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