^:once on fn* (not fn, the fn macro doesn't propagate metadata) instructs the commielr to clear closed-overs ASAP. It follows that you can't call such a function twice because it forgets its closed-overs.
On Wed, Sep 11, 2013 at 4:36 PM, Brian Craft <craft.br...@gmail.com> wrote: > ugh. Can't find documentation for this. What does it do? > > On Wednesday, September 11, 2013 2:22:56 AM UTC-7, Christophe Grand wrote: > >> >> On Wed, Sep 11, 2013 at 6:00 AM, Brian Craft <craft...@gmail.com> wrote: >> >>> (defmacro transaction >>> [& body] >>> `(transaction* (fn [] ~@body))) >>> >>> I'm not sure how to avoid that. The anonymous function created here >>> doesn't take parameters. >>> >> >> The fix for this is: >> (defmacro transaction >> [& body] >> `(transaction* (^:once fn* [] ~@body))) >> >> It should be the default for all one-shot fns. >> >> Christophe >> >> -- >> On Clojure http://clj-me.cgrand.net/ >> Clojure Programming http://clojurebook.com >> Training, Consulting & Contracting http://lambdanext.eu/ >> > -- On Clojure http://clj-me.cgrand.net/ Clojure Programming http://clojurebook.com Training, Consulting & Contracting http://lambdanext.eu/ -- -- 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 --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
