Are you sure? user=> (defprotocol A (foo [a b])) A user=> (extend-protocol A (Class/forName "[D") (foo [a b] [a b])) nil user=> (pprint (foo (double-array [1 2 3]) 1)) [[1.0, 2.0, 3.0] 1] user=> (pprint (amap (float-array [1 2 3]) i ret (float (* 2 (aget ret i))))) [2.0, 4.0, 6.0]
My guess is you're not remembering to cast to the appropriate type in your loop expression in amap. For instance: user=> (amap (float-array [1 2 3]) i ret i) IllegalArgumentException No matching method found: aset clojure.lang.Reflector.invokeMatchingMethod (Reflector.java:80) Whereas you need: user=> (amap (float-array [1 2 3]) i ret (float i)) #<float[] [F@6a636064> --Aaron On Thu, Jun 13, 2013 at 12:57 PM, Jim - FooBar(); <jimpil1...@gmail.com>wrote: > more weirdness! > > > try this at your REPL: > > -extend any protocol to some primitive array type - let's say 'doubles' > -while in the same namespace, try to use amap passing it an array of > floats and also type-hint it with ^floats > * > **IllegalArgumentException No matching method found: aset > clojure.lang.Reflector.invokeMatchingMethod (Reflector.java:80)* > > the same would have happened if the protocol had been extended to floats > and tried to use amap with doubles. In fact any combination of primitive > types will fail. Only the type that has been extended will work. In the > above case that would be doubles. If we extended the protocol to longs then > only longs would work and so forth... > > I'm almost certain that this is not intentional...any opinions? > > Jim > > -- > -- > 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.
