On Thu, Jan 1, 2009 at 11:48 PM, Chouser <chou...@gmail.com> wrote: > > On Thu, Jan 1, 2009 at 2:47 PM, Rock <rocco.ro...@gmail.com> wrote: >> >> Given that there's nothing like letrec in Clojure, and that let acts >> like let* in CL, I gather that local recursive functions are possible >> whereas local mutually recursive ones are not. Is that correct? If so, >> will they ever be in the future? > > I assume you meant "are not possible". I think someone previously > posted a letrec macro using something he called a "Y* combinator". I > don't know what that is, but he said it was slow. > > Here's another way. Nothing about it is pretty, but it is a > possibility: > > (let [my-even-atom (atom nil) > my-even? (fn [i] (@my-even-atom i)) > my-odd? (fn [i] > (if (zero? i) > false > (@my-even-atom (dec i))))] > (swap! my-even-atom > (constantly (fn [i] > (if (zero? i) > true > (my-odd? (dec i)))))) > (my-odd? 4))
I don't get this listing. You define my-even? but do not use it? > > Ick. But perhaps a macro could make style less terrible to use? > > --Chouser > > > > -- Venlig hilsen / Kind regards, Christian Vest Hansen. --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
