Another way to handle it would be to use the alternate syntax for static methods:
(defmacro foo [x] `(Character/isWhitespace ~x)) which would expand properly. Using the dot form for instance methods, i.e. (.method obj) should also keep syntax quote from expanding it improperly. On Mar 28, 12:59 pm, "ke...@ksvanhorn.com" <kvanh...@ksvanhorn.com> wrote: > 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 -~----------~----~----~----~------~----~------~--~---
