Instances for Storable

[Nivia Q.]

Hi GHC users,
I've been  trying to create a instance for Maybe type in the Storable class. I need to override the peek and poke methods, but I'm having some difficulties. I was intended  to do something like this:
 
instance Storable t =>Storable (Maybe t) where
 peek ptr = maybePeek peek ptr
 poke ptr valMaybe = do
                                   ptr<-maybeNew (new) valMaybe
                                   return()
 
Obviously, there is a type error on the definition of peek, because  the type of prt  is (Ptr a), not (Ptr (Maybe a)) . I don't know how to fix it and,  at the same time, keep using instanciation.
I would be grateful for suggestions,
Regards,
 


_________________________________________________
Nivia Cruz Quental
Graduação em Eng. Computação - UPE
Técnica em Telecomunicações - CEFET-PE - Brasil






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