To simplify the problem: ((binding [*funkybind* true] (fn [] *funkybind*)))
This is the same problem as your lazy-seq example. The issue is that *funky-bind* is not deref'ed when the anonymous fn is created, but when it is executed. In this example, by the time the fn is executed, *funkybind* has reverted back to its old state. Timothy On Mon, Apr 22, 2013 at 8:08 PM, Carlo Zancanaro <carlozancan...@gmail.com>wrote: > If you want to capture the binding and have laziness together you can also > use `bound-fn`. > > (binding [*funkybind* true] (map (fn [_] *funkybind*) [0 1])) > ;=> (false false) > (binding [*funkybind* true] (map (bound-fn [_] *funkybind*) [0 1])) > ;=> (true true) > > > On Tue, Apr 23, 2013 at 11:52 AM, Travis Vachon > <travis.vac...@gmail.com>wrote: > >> Hi Daniel >> >> map is creating a lazy seq, which isn't evaluated until the REPL's >> forces it to be printed, which is outside the scope of the binding. >> >> This: >> >> (binding [*funkybind* true] >> (doall (map (fn [_] *funkybind*) [1 2]))) >> >> forces evaluation inside the binding, and does what you want. >> >> This is something I've been bitten by a few times, but the power that >> lazyness brings ends up being worth it, IMHO. >> >> Good luck! >> >> Travis >> >> On Mon, Apr 22, 2013 at 9:41 PM, Daniel Higginbotham >> <nonrecurs...@gmail.com> wrote: >> > I've encountered a situation where the binding function doesn't work as >> I >> > expect it: >> > >> > user> (def ^:dynamic *funkybind* false) >> > >> > ;; expected >> > user> (binding [*funkybind* true] >> > *funkybind*) >> > true >> > >> > ;;expected >> > (binding [*funkybind* true] >> > ((fn [] *funkybind*))) >> > true >> > >> > ;;... huh? >> > (binding [*funkybind* true] >> > (map (fn [_] *funkybind*) [1 2])) >> > (false false) >> > >> > In the last example, why is the value of *funkybind* false instead of >> true? >> > >> > Thanks! >> > Daniel >> > >> > -- >> > -- >> > 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. >> > >> > >> >> -- >> -- >> 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. >> >> >> > -- > -- > 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. > > > -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- -- 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.
