Hello,
For example, the natural and naive way to write Andrew's "mean" function doesn't involve tuples at all: simply tail recurse with two accumulator parameters, and compute the mean at the end. GHC's strictness analyser does the right thing with this, so there's no need for seq, $!, or the like. It's about 3 lines of code.
Is this the code you mean? meanNat = go 0 0 where go s n [] = s / n go s n (x:xs) = go (s+x) (n+1) xs If so, bang patterns are still required bang patterns in ghc-6.8.2 to run in constant memory: meanNat = go 0 0 where go s n [] = s / n go !s !n (x:xs) = go (s+x) (n+1) xs Is there some other way to write it so that ghc will essentially insert the bangs for me? -Jeff --- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.