[Haskell-cafe] strange stack overflow with Data.Map
u.stenzel at web.de
Wed Dec 28 22:05:05 EST 2005
David Roundy wrote:
> > stats elems = foldl add_elem Map.empty elems
> > add_elem m x = Map.insertWith (+) x 1 m
> I tried defining
> add_elem m x = let m' = Map.insertWith (+) x 1 m
> Just num = Map.lookup x m'
> in seq num m'
> to force the (+) to be evaluated strictly, but that didn't help.
No, it doesn't, unless you also use foldl'. Not tested, but been
there, seen it, bought the t-shirt.
The Force is what holds everything together. It has its dark side, and
it has its light side. It's sort of like cosmic duct tape.
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