On Tue, Jan 20, 2009 at 10:54 PM, Hugh Winkler <hwink...@gmail.com> wrote: > but why not make "safe" the default? i.e. use "unsafe-binding" if > you know it's OK.
Not all seqs are finite. Also, Clojure skews toward lazy-by-default. Once a function has run inside a `binding, I would assume that the result it delivers is exactly what it means to deliver. And `map means to deliver a lazy seq. If `binding, however, decided to do something with that result before returning, then I would consider that a side-effect of binding. It would mean that I cannot use `binding that produce a lazy-seq sources from some IO resource or any infinite seq. This "safe" would probably either do too much work in the wrong thread or blow my heap. >From the interaction bellow, I'd probably prefer the style of the 'h function for this kind of situation: user=> (def *num* 16) #'user/*num* user=> (defn f [] (map (fn [_] *num*) [1])) #'user/f user=> (defn g [] (map (constantly *num*) [1])) #'user/g user=> (defn h [n] (map (constantly n) [1])) #'user/h user=> (binding [*num* 1024] (f)) (16) user=> (binding [*num* 1024] (g)) (1024) user=> (binding [*num* 1024] (h *num*)) (1024) -- 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 -~----------~----~----~----~------~----~------~--~---
