I'm in the process of learning Clojure, and I ran across something that other newbies like me may find useful. The question I had was this: how does one get a method name into a macro? Consider the following code:
(defmacro foo [x] `(. Character (isWhitespace ~x))) Yes, I know that this would be better defined as a function, but it's a simple example to illustrate the problem. If I evaluate (macroexpand '(foo \a)) I get (. java.lang.Character (user/isWhitespace \a)) which is not what I want -- the expansion of Character to java.lang.Character is fine, but I want the symbol isWhitespace to remain as is. Trying to evaluate (foo \a) gives a "no such var" exception, as user/isWhitespace is not found. The solution I found was to keep the symbol isWhitespace out of the scope of the backquote operator: (defmacro foo [x] `(. Character (~'isWhitespace ~x))) Then (foo \a) expands to (. java.lang.Character (isWhitespace \a)) as desired. --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
