Thank you for the discussion - even if I dont understand it immediately ;-)
Grettings, alux On 5 Mai, 17:32, David Nolen <dnolen.li...@gmail.com> wrote: > On Wed, May 5, 2010 at 11:11 AM, Sean Devlin <francoisdev...@gmail.com>wrote: > > > I think there's a fundamental assumption that I disagree with. > > > Since we've already opened the can of worms that is auto-promotion, it > > should *always* work. Given auto-promotion, + shouldn't be fast (use > > unchecked-add), it should be predictable. Same for -, * and friends. > > Quality is more important than performance, principle of least > > surprise, etc. > > > Sean > > unchecked arithmetic operations are discouraged because ... they are > unchecked. + is fast *and* it checks for overflow on primitive types. Again > + is not doing any auto-promoting here. Putting a primitive in a var is. > Case 1 in the OP is the surprise for those who don't know that. Case 2 is > the correct behavior that I've come to expect from + when passing in > primitive types. > > For those who rely on fast arithmetic, having +, * and friends be slow is > simply unacceptable (and that's not a small number of Clojurians, and it > should include anyone wishes to see a performant Clojure written in itself). > > This is a conceptual break from some other dynamic languages - but then the > performance guarantees of those languages is nothing to brag about either. > Clojure ships with great performance guarantees - that's a feature. > > David > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group > athttp://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
