Am Dienstag, 13. November 2012 12:09:39 UTC+1 schrieb Jim foo.bar: > > You can't convert to keyword simply by (str ":" (str (first > components))...you need the (keyword (first components))
in the meantime I learned this from Christophe > ...also why is > your argument (symbol "obj")? I'd prefer obj# or (gensym obj)... > I looked for something like that, but didn't find Bitte um Rücksprache! Johannes > On 13/11/12 10:06, Johannes wrote: > > Hi, > > > > I define a record > > (defrecord point [x y]) > > > > and the following macro: > > > > (defmacro drg > > [typename components] > > `(def ~(symbol (str typename "-" (str (first components)))) > > (fn [~(symbol "obj")] (get ~(symbol "obj") ~(symbol (str ":" (str > > (first components)))))))) > > > > the call > > user> (macroexpand-1 '(drg point [x y])) > > > > delivers what I expect: > > (def point-x (clojure.core/fn [obj] (clojure.core/get obj :x))) > > > > Evalutating this expression at the repl delivers what I expect: > > user> (def point-x (clojure.core/fn [obj] (clojure.core/get obj :x))) > > #'user/point-x > > > > But calling the macro results in an error message: > > user> (drg point [x y]) > > CompilerException java.lang.RuntimeException: Unable to resolve > > symbol: :x in this context, compiling:(NO_SOURCE_PATH:1) > > > > Can anyone tell me what my mistake is? > > > > Johannes > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to clo...@googlegroups.com<javascript:> > > Note that posts from new members are moderated - please be patient > > with your first post. > > To unsubscribe from this group, send email to > > clojure+u...@googlegroups.com <javascript:> > > 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 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
