Malcolm Wallace <[EMAIL PROTECTED]> wrote, > Manuel M T Chakravarty <[EMAIL PROTECTED]> writes: > > > Sure, but there is also > > null = (== []) > > in the Prelude and `Maybe.isNothing'. > > No, the definition of null is > null [] = True > which is quite different from (==[]) because it has a less-constrained type. > null :: [a] -> Bool > (==[]) :: Eq a => [a] -> Bool > > Likewise, > isNothing :: Maybe a -> Bool > (==Nothing) :: Eq a => Maybe a -> Bool > > So there are good reasons for having separate predicates testing > the null/empty case at those polymorphic types, but no reason (except > consistency of naming) for a pseudo-polymorphic type like Ptr a.
Oh, you are right. I overlooked this. In this case, I actually tend to not include these extra functions (unless somebody likes to argue in their favour). Cheers, Manuel _______________________________________________ FFI mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/ffi
