On Thu, Mar 8, 2012 at 8:12 PM, Edward Kmett <ekm...@gmail.com> wrote: > I'm currently working with a lot of very short arrays of fixed length and as > a thought experiment I thought I would try to play with fast numeric field > accessors > > ... > > This becomes more reasonable to consider when you are forced to make > something like > >> data V4 a = V4 a a a a > > using > >> unsafeIndex (V4 a _ _ _) 0 = a >> unsafeIndex (V4 _ b _ _) 1 = b >> unsafeIndex (V4 _ _ c _) 2 = c >> unsafeIndex (V4 _ _ _ d) 3 = d > > rather than > >> unsafeIndex :: V4 a -> Int -> a >> unsafeIndex = unsafeField
I'm dealing with exactly this problem in unordered-containers. I'm dealing with small (16) element arrays that I need 1) index into and 2) update a single element off. I use Array# and MutableArray# for this, but they aren't optimal, mostly because they are optimized for the case of larger arrays (e.g. they use card tables and out-of-line allocation.) -- Johan _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
