Rebinding functions?
It's currently not possible to dynamically rebind functions: (binding [+ -] (+ 5 3)) == 8 ;; not 2 Would this be supported in the future? It would make it easier, for example, to extend the current tracing functionality, e.g. (trace-in-expr [f1 f2] (f1 (f2 10))) == (let [oldf1 f1 oldf2 f2] (binding [f1 (fn [ args] (trace-fn-call 'f1 oldf1 args)) f2 (fn [ args] (trace-fn-call 'f2 oldf2 args))] (f1 (f2 10 Thanks, -- Michel S. --~--~-~--~~~---~--~~ 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: Rebinding functions?
On Tue, Jun 16, 2009 at 1:38 PM, Michel Salim michel.syl...@gmail.comwrote: It's currently not possible to dynamically rebind functions: (binding [+ -] (+ 5 3)) == 8 ;; not 2 Thanks, -- Michel S. It is possible to rebind (even core) functions, but there are a couple of limitations. One of which is the fact that some functions are inlined by the compiler. I believe the two argument case of '+ is one of those. Paul --~--~-~--~~~---~--~~ 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: Rebinding functions?
Yes, people have shown examples on this list where (+ a b) is dramatically faster than (+ a b c) On Jun 16, 1:42 pm, Paul Stadig p...@stadig.name wrote: On Tue, Jun 16, 2009 at 1:38 PM, Michel Salim michel.syl...@gmail.comwrote: It's currently not possible to dynamically rebind functions: (binding [+ -] (+ 5 3)) == 8 ;; not 2 Thanks, -- Michel S. It is possible to rebind (even core) functions, but there are a couple of limitations. One of which is the fact that some functions are inlined by the compiler. I believe the two argument case of '+ is one of those. Paul --~--~-~--~~~---~--~~ 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: Rebinding functions?
On Jun 16, 1:42 pm, Paul Stadig p...@stadig.name wrote: On Tue, Jun 16, 2009 at 1:38 PM, Michel Salim michel.syl...@gmail.comwrote: It's currently not possible to dynamically rebind functions: (binding [+ -] (+ 5 3)) == 8 ;; not 2 Thanks, -- Michel S. It is possible to rebind (even core) functions, but there are a couple of limitations. One of which is the fact that some functions are inlined by the compiler. I believe the two argument case of '+ is one of those. I just verified and it does indeed work -- thanks. Time to read up on macros to implement this tracing construct, then. -- Michel --~--~-~--~~~---~--~~ 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: Rebinding functions?
you can use apply to avoid in-lining: user= (binding [+ -] (apply + '(5 3))) 2 On Tue, Jun 16, 2009 at 11:16 AM, Michel S.michel.syl...@gmail.com wrote: On Jun 16, 1:42 pm, Paul Stadig p...@stadig.name wrote: On Tue, Jun 16, 2009 at 1:38 PM, Michel Salim michel.syl...@gmail.comwrote: It's currently not possible to dynamically rebind functions: (binding [+ -] (+ 5 3)) == 8 ;; not 2 Thanks, -- Michel S. It is possible to rebind (even core) functions, but there are a couple of limitations. One of which is the fact that some functions are inlined by the compiler. I believe the two argument case of '+ is one of those. I just verified and it does indeed work -- thanks. Time to read up on macros to implement this tracing construct, then. -- Michel -- And what is good, Phaedrus, And what is not good— Need we ask anyone to tell us these things? --~--~-~--~~~---~--~~ 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: Rebinding functions?
On Jun 16, 2:22 pm, Kevin Downey redc...@gmail.com wrote: you can use apply to avoid in-lining: user= (binding [+ -] (apply + '(5 3))) 2 Indeed; this is what my macro ended up doing anyway, since it has to work regardless of the arity of the functions to trace. -- Michel --~--~-~--~~~---~--~~ 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: Rebinding functions?
This post worries me. I've considered rewriting functions as inlining-macros for optimization purposes. But I thought it would be a transparent change. This post shows that it's not a transparent change, and could potentially lead to some very odd looking bugs. What if I wanted to optimize println by replacing it with a inlining- macro? Now users that rebind println to do something extra will be bewildered that the binding is not working. Any thoughts? -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 -~--~~~~--~~--~--~---
