Re: [Haskell-cafe] Re: General function to count list elements?

On Mon, Apr 20, 2009 at 7:57 AM, Achim Schneider wrote:

Lennart Augustsson wrote:

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On Sun, Apr 19, 2009 at 10:43 PM, Peter Verswyvelen wrote:

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For example, suppose you have a predicate a -> Bool, and a list of these predicates [a -> Bool], but you want to remove all functions that are obviously equal in the C way from the list for optimization... Okay big hack, and one could do this already with reallyUnsafePtrEquality# I guess...

And when the need gets big enough you pull out StablePtr and use that. :)

Waaagh! Don't give him ideas, he's going to do it...

Nah, I don't think so. I think, even after all this mess, we've been relatively clear that Eq is how you do it. Luke