Performance-loss of accessing data through class?
simons at cryp.to
Thu Oct 14 07:49:27 EDT 2004
Simon Marlow writes:
>>> class KnowsMyStuff a where
>>> foo :: a -> Int
>>> bar :: a -> Float
>>> etc :: a -> [String]
>> If I did that, how much performance would I lose?
> If your code is using a method from a known instance of a
> class, and the method has a small enough definition, then
> chances are good that it'll get inlined and the extra
> layer of abstraction will dissappear. I'm guessing this
> is the case with your example.
Great, that's good to hear.
> We always enjoy investigating benchmarks, so if you have
> some code you think isn't going fast enough, then post it
> here and we'll help you find out where the performance
> problems are.
Alright, thanks for the offer. I'll certainly do that when I
notice anything. So far, I am pleased to say that the
performance is better than I had expected, actually. That
doesn't happen very often. :-)
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