Of course (!) is polymorphic
(!) :: Ix a => Array a b -> a -> b
but on the other hand the GHC manual says
Overloaded functions are not your friend:
Haskell's overloading (using type classes) is elegant,
neat, etc., etc., but
it is death to performance if left to linger in an inner loop.
I assume (!) is inlined and specialized by GHC,
but what does hugs do? Does it build and pass around
dictionaries all the time I index an array?
(In my case, I am forced to use (run)hugs.)
Just curious,
--
-- Johannes Waldmann ---- http://www.informatik.uni-leipzig.de/~joe/ --
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