Hi, all It seems Lisp macro expander will not evalute the argument prefixed by unquote. The following code, written in Common Lisp, is an excerpt from `On Lisp'. This macro implemented `let'.
1. (defmacro our-let (binds &body body) 2. ‘((lambda ,(mapcar #’(lambda (x) 3. (if (consp x) (car x) x)) 4. binds) 5. ,@body) 6. ,@(mapcar #’(lambda (x) 7. (if (consp x) (cadr x) nil)) 8. binds))) `body' on the 5th line is not evaluted when the macro got expanded, but the `mapcar' on the 2nd line is evaluated. I think the problem/characteristic would be the same no matter which Lisp dialect you use. I've tried to debug into the Clojure Compiler, but the key code was generated on the fly. So I failed to figure it out how Clojure did it. And I'm not a Common Lisp geek either, can't go deep into the interrepter. So, would someone please tell me if the arguments are really treated specially? Or, am I just wrong at all these? Helps will be appreciated. -- 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
