:: Follow ups to haskell-cafe@ is probably best
Hi Alex,
{-# OPTIONS_DERIVE --derive=Ord,Eq,Read... #-}
That would apply to all definitions in the module, so you don't have
to repeat it for each type. You can attach a deriving annotation to
each type individually, but that's obviously not what you want.
Actually independent deriving would help a lot but am not sure of the
syntax.
could it be something like
derive (Ord,Eq,Read,Show,Typeable) (BlogEntry Name Title Body Emai)
We can already do:
$( derive makeOrd ''Name )
Which doesn't require a preprocessor on GHC, using template haskell. I
guess the following may work in Template Haskell:
$( [derive typ cls | typ <- [makeOrd, makeEq, makeRead, makeShow], typ
<- [''BlogEntry, ''Name ...] )
But ask a TH expert for the details!
Thanks
Neil
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