--- Simon Marlow wrote:

Interesting, I get pretty much the same results as you, except that DData.Map is now quicker on the lookup test than both FiniteMap and AVL (0.120 vs. 0.134 and 0.138 respectively).

Ok, so that means that I should merge in the last change by Daan (and in IntSet too)? (patch in extenso at the end of the message)

I'm not going to investigate this any further, because it'll take forever to get to the bottom of. I think we've arrived at a reasonable conclusion, that the old FiniteMap is definitely superceded but there isn't a clear choice between the others, so we should provide them all.

How about the following modules:

Data.Map -- a default implementation of maps, eg. DData.Map Data.Map.AVL -- same interface, based on AVL trees Data.Map.Int -- current DData.IntMap

DData.IntMap isn't exactly a drop in replacement for DData.Map. It can't have the same interface, if only because the data types are not the same kind. So, I'm not sure it should be treated the same as AVL. Cheers, JP. ---------------------------------------------- hunk ./DData/IntMap.hs 263 + = let nk = natFromInt k in seq nk (lookupN nk t) + +lookupN :: Nat -> IntMap a -> Maybe a +lookupN k t hunk ./DData/IntMap.hs 269 - | nomatch k p m -> Nothing - | zero k m -> lookup k l - | otherwise -> lookup k r + | zeroN k (natFromInt m) -> lookupN k l + | otherwise -> lookupN k r hunk ./DData/IntMap.hs 272 - | (k==kx) -> Just x - | otherwise -> Nothing + | (k == natFromInt kx) -> Just x + | otherwise -> Nothing hunk ./DData/IntMap.hs 1102 +zeroN :: Nat -> Nat -> Bool +zeroN i m = (i .&. m) == 0 + hunk ./Makefile 52 +Test.o : Test.hs +Test.o : ./DData/IntSet.hi } __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/