(isa? [String String] [Object Object]) returns true. This is nice and useful.
However (isa? '(String String) '(Object Object) returns false, this is not so nice. (isa? '(String String) [Object Object]) also return false. So the moral of the story is that for multiple argument dispatch to work, I need to use 'mapv' instead of 'map' in my dispatch function, which I have done. But it was sort of a pain to find out the hard way (i.e. time spent debugging) that 'map' won't work in this regard. I.e. this fails: (defmulti foo (fn [ & args ] (map class args))) (defmethod foo [Object Object] [a b] (println a b)) (foo "a" "b") IllegalArgumentException No method in multimethod 'foo' for dispatch value: clojure.lang.LazySeq@86465241 clojure.lang.MultiFn.getFn (MultiFn.java:160) but this works: (defmulti bar (fn [ & args ] (mapv class args))) (defmethod bar [Object Object] [a b] (println a b)) (bar "a" "b") a b Bug or feature? Clojure 1.5.1 -- 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.
