Ah, thanks! b
On Thu, Apr 29, 2010 at 11:37 AM, Daniel Fischer <daniel.is.fisc...@web.de> wrote: > Am Donnerstag 29 April 2010 20:08:00 schrieb Ben: >> A technical question: it seems like the instance of ArrowLoop is too >> strict (this is something I've wondered about in Liu's paper too.) >> Shouldn't it be >> >> instance ArrowLoop SFAuto where >> loop (SFAuto s f) = SFAuto s f' >> where >> f' (b, s1) = let (~(c, d), s2) = f ((b, d), s1) >> in (c, s2) > > Let-bindings are already lazy, so the '~' makes no difference here. > Apart from the readability, both are the same as > > where > f' (b,s1) = let x = f ((b, snd $ fst x),s1) in (fst $ fst x, snd x) > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
