(symbol (str ":" (str (first components)))) should be (keyword (first components)) In your expansion, :x is not a keyword but a symbol starting by a colon -- the symbol fn performs no validation on its input. When you copied/pasted it for evaluation it was then read as a keyword.
Btw I'm a little worried: are you planning to generate accessors for your fields or are you just toying with macros? hth, Christophe On Tue, Nov 13, 2012 at 11:06 AM, Johannes <bra...@nordakademie.de> 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 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 -- Professional: http://cgrand.net/ (fr) On Clojure: http://clj-me.cgrand.net/ (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
