Thanks for all the replies everyone, I certainly have a solution now. But I am still a little confused. Take this slight variation...
user=> (defmacro foo [coll] `(map identity ~coll)) #'user/foo user=> (foo [1 2 3 `(+ 1 1)]) (1 2 3 (clojure.core/+ 1 1)) In this one, I am passing an explicit list and simply calling unquote on it. I guess what I want to know is, how is passing an explicit list different from having one destructured with '&' in the arguments list? On Jul 7, 1:04 pm, Nicolas Oury <nicolas.o...@gmail.com> wrote: > Of course I meant > (map identity (1 2)) > > > > On Wed, Jul 7, 2010 at 6:03 PM, Nicolas Oury <nicolas.o...@gmail.com> wrote: > > If you macroexpand the first foo in (foo 1 2), you will see something like > > (1 2) > > > when this gets evaluated, Clojure is not happy about 1 not being a > > function. > > > On Wed, Jul 7, 2010 at 5:49 PM, Cameron <cpuls...@gmail.com> wrote: > > >> Hello all! Today, I've either discovered a bug, or I've discovered a > >> flaw in my understanding of macros. Most likely the latter :-) Could > >> anyone set me straight? > > >> While this is not the macro I was trying to write, it falls over in > >> the same place. > > >> (user=> (defmacro foo [& xs] `(map identity ~xs)) > >> #'user/foo > >> user=> (foo 1 2) > >> java.lang.ClassCastException: java.lang.Integer cannot be cast to > >> clojure.lang.IFn (NO_SOURCE_FILE:0) > > >> However, this does work (though it doesn't feel idiomatic). > > >> user=> (defmacro foo [& xs] `(map identity [...@xs])) > >> #'user/foo > >> user=> (foo 1 2) > >> (1 2) > > >> I have tried this on todays (July 7) bleeding edge and 1.1 with the > >> same results. > > >> -- > >> 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<clojure%2bunsubscr...@googlegroups.com > >> > > >> For more options, visit this group at > >>http://groups.google.com/group/clojure?hl=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
