I've just figured out that the macro version in the allocate example can't be used with local variables.
(let [foo ByteBuffer] (allocate1 foo 1024)) throws java.lang.UnsupportedOperationException: Can't eval locals (NO_SOURCE_FILE:94) On Jul 6, 6:59 pm, Nicolas Buduroi <nbudu...@gmail.com> wrote: > Hi, I needed to call a static method on a class stored in a var > yesterday and found that it was a little bit trickier than I initially > thought. There's three way of doing it, the two first are quite > straightforward and working ;-) e.g.: > > (import '(java.nio ByteBuffer FloatBuffer)) > > (def foo ByteBuffer) > > (. foo (allocate 1024)) ; throw an exception as intended. > > (defmacro allocate1 [buffer-type size] > `(. ~(eval buffer-type) (allocate ~size))) > > (defn allocate2 [buffer-type size] > (eval `(. ~buffer-type (allocate ~size)))) > > (allocate1 foo 1024) > (allocate2 foo 1024) > > Both works fine, but I'm still not sure which one is the best. The > third way is to call a static method from the class object, I've tried > something but wasn't able to get it working. It throws some weird > exception, here's the code: > > (defn to-primitive [class] > (try > (let [type (.getField (identity class) "TYPE")] > (.get type Object)) > (catch NoSuchFieldException _ class))) > > (defmacro call-static [class name & args] > (let [arg-types (into-array > (map (comp to-primitive #(.getClass %)) args)) > method (.getMethod (eval class) name arg-types)] > `(.invoke ~method ~class ~...@args))) > > When calling this macro (call-static foo "allocate" 1024) it throws: > java.lang.RuntimeException: Can't embed object in code, maybe print- > dup not defined: public static java.nio.ByteBuffer > java.nio.ByteBuffer.allocate(int) (NO_SOURCE_FILE:0) > > This error message is quite puzzling isn't it? > > Is there any other way? > > Thanks > > - budu --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
