8 Apr
2006
8 Apr
'06
2:55 p.m.
Hello David, Saturday, April 8, 2006, 9:58:56 PM, you wrote:
bitsTable :: Array Word Int bitsTable = array (0,255) $ [(i,bitcount i) | i <- [0..255]]
bitsTable :: UArray Word Int bitsTable = listArray (0,255) $ map bitcount [0..255] UArray is much faster than Array but can be used only for simple datatypes (integral, floating point, Char, Bool). more info at http://haskell.org/haskellwiki/Arrays btw: you can use "UArray a Bool" to represent sets of ANY type `a` belonging to class Ix. It uses only one bit per elemnt in current implementation -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com