Thank you for your explanation! I don't think I fully understand your point. But I'll try. :)
On 11월3일, 오후11시24분, Chouser <[EMAIL PROTECTED]> wrote: > On Mon, Nov 3, 2008 at 9:13 AM, Chanwoo Yoo <[EMAIL PROTECTED]> wrote: > > > Below code is copied from 'On Lisp'. I just changed , to ~. But this > > code does not work in Clojure. > > > (defmacro abbrev [short long] > > `(defmacro ~short [& args] > > `(~'~long [EMAIL PROTECTED]))) > > > Is there any important issue what I am overlooking when writing macros > > in Clojure? Any help appreciated. > > (defmacro abbrev [short long] > `(defmacro ~short [& args#] > `(~'~long [EMAIL PROTECTED]))) > > Your clue here is the error message: > > Can't use qualified name as parameter: user/args > > Clojure has a unique combination of features that help increase the > hygine of macros. In your original translation, the word "args" was > resolved into the "user" namespace because it was left bare. For > local names (like formal arguments, "let" locals, etc.) you don't want > that, so you need to use some mechanism to make it clear what you > mean. One such mechanism is gensym (in this case I used the trailing > # which is an auto-gensym). Another option is ~'foo which would > explicitly capture "foo" from the context where the macro is expanded. > > --Chouser --~--~---------~--~----~------------~-------~--~----~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
