The extend-type macro silently fails when used to extend an array type: => eval `(extend-type ~(class (into-array Object [42])) Xfer (look [this#] (aget this# 0)) (mutate* [this# f# args#] (aset this# (apply f# (aget this# 0) args#) 0)))) nil => (def foo (into-array Object [42])) #'user/foo => (seq foo) (42) => (mutate foo * 2) #<CompilerException java.lang.IllegalArgumentException: No implementation of method: :mutate* of protocol: #'user/Xfer found for class: [Ljava.lang.Object; (NO_SOURCE_FILE:0)>
If you're curious what I was doing, I'm looking to slap together a little demonstration of data races screwing up invariants and the exact same (polymorphic) code not causing the same problem if refs are used instead -- hence a protocol to mutate a thread-unsafe mutable cell that can also be extended sensibly to refs (and, for that matter, atoms). -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- 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
