Destructuring in clojure/binding
Hi, I found this old post: http://groups.google.com/group/clojure/browse_thread/thread/45e118a638a5af8e/02eab5ae0d9023ff?lnk=gstq=binding+destructuring#02eab5ae0d9023ff And was wondering what is the status of Stephen's patch? Is there a reason why clojure/binding does not support destructuring in its argument list? (binding [[a b] [1 2]] (println a b)) gives: java.lang.ClassCastException: clojure.lang.PersistentVector cannot be cast to clojure.lang.Symbol (NO_SOURCE_FILE:7) Thanks for the help -Patrick -- 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
Re: Support for destructuring in clojure/binding
On Sep 22, 4:36 am, Stephen C. Gilardi [EMAIL PROTECTED] wrote: I was surprised that clojure/binding doesn't support destructuring bind: Clojure user= (def a) #'user/a user= (def b) #'user/b user= (binding [[a b] [1 2]] (+ a b)) Hello Stephen. I am not sure I understand. Your example doesn't seem to suggest that you are really needing a form of destructuring. Rather, it looks like multiple bindings. Presently, I can do: krukow:~/languages/clojure/trunk$ cl Clojure user= (def a) #'user/a user= (def b) #'user/b user= (binding [a 1 b 2] (+ a b)) 3 user= Would that be enough? Kind regards, - Karl --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Support for destructuring in clojure/binding
Rich, This is code from my socket repl that sparked my interest in support for destructuring in clojure/binding. (defn socket-streams ;; returns a vector of 3 streams [s] [(LineNumberingPushbackReader. (InputStreamReader. (.getInputStream s) UTF-8)) (OutputStreamWriter. (.getOutputStream s) UTF-8) (PrintWriter. (OutputStreamWriter. (.getOutputStream s) UTF-8) true)]) (defn socket-repl;; accepts a vector of 3 streams with minimal fuss Starts a repl thread on the iostreams of supplied socket [s] (on-thread #(binding [[*in* *out* *err*] (socket-streams s)] (SocketRepl/ repl I've updated the patch I posted previously. I think this implementation is very readable and a nice example of how much destructuring, metadata, and reader support for a variety of collections can contribute to making Clojure code more clear and compact. http://clojure.googlegroups.com/web/destructuring-binding.patch Please consider including it in Clojure. Thanks, --Steve --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
