Fail to run dynamic binding code with Clojure1.4
Hi, all. I am reading Clojure in Action. In the scope section of Chapter3, there are examples like this: defn twice [x] (println original function) (* 2 x)) (defn call-twice [y] (twice y)) (defn with-log [function-to-call log-statement] (fn [ args] (println log-statement) (apply function-to-call args))) (call-twice 10) (binding [twice (with-log twice Calling the twice function)] (call-twice 20)) (call-twice 30) When I tried to run this code in repl, I got the following exception: IllegalStateException Can't dynamically bind non-dynamic var: user/twice clojure.lang.Var.pushThreadBindings (Var.java:353) Is the book wrong or I'm running with the wrong version of clojure? -- 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: Fail to run dynamic binding code with Clojure1.4
As of Clojure 1.3 you need to mark things you with to re-bind explicitly as dynamic: (defn ^:dynamic twice [x] ...) On Tue, Oct 30, 2012 at 7:42 PM, Satoru Logic satorulo...@gmail.com wrote: Hi, all. I am reading Clojure in Action. In the scope section of Chapter3, there are examples like this: defn twice [x] (println original function) (* 2 x)) (defn call-twice [y] (twice y)) (defn with-log [function-to-call log-statement] (fn [ args] (println log-statement) (apply function-to-call args))) (call-twice 10) (binding [twice (with-log twice Calling the twice function)] (call-twice 20)) (call-twice 30) When I tried to run this code in repl, I got the following exception: IllegalStateException Can't dynamically bind non-dynamic var: user/twice clojure.lang.Var.pushThreadBindings (Var.java:353) Is the book wrong or I'm running with the wrong version of clojure? -- 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 -- 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: Fail to run dynamic binding code with Clojure1.4
The code works as written in Clojure 1.2 and 1.2.1. It doesn't in 1.3 and later, unless you change the definition of twice to annotate that it is a dynamic var, like so: (defn ^:dynamic twice [x] (println original function) (* 2 x)) With that change, it works in Clojure 1.3 and later. Andy On Oct 30, 2012, at 5:42 PM, Satoru Logic wrote: Hi, all. I am reading Clojure in Action. In the scope section of Chapter3, there are examples like this: defn twice [x] (println original function) (* 2 x)) (defn call-twice [y] (twice y)) (defn with-log [function-to-call log-statement] (fn [ args] (println log-statement) (apply function-to-call args))) (call-twice 10) (binding [twice (with-log twice Calling the twice function)] (call-twice 20)) (call-twice 30) When I tried to run this code in repl, I got the following exception: IllegalStateException Can't dynamically bind non-dynamic var: user/twice clojure.lang.Var.pushThreadBindings (Var.java:353) Is the book wrong or I'm running with the wrong version of clojure? -- 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: Fail to run dynamic binding code with Clojure1.4
Yes, it's very unfortunate that Manning released Clojure in Action without a final pass to make it Clojure 1.3 compatible. I talked to them about it when they still had time to make changes but they decided to go ahead and publish a book that is tightly wedded to Clojure 1.2 after Clojure 1.3 had been released. I think it was a disservice to both the author and the community :( Sean On Tue, Oct 30, 2012 at 6:36 PM, Andy Fingerhut andy.finger...@gmail.com wrote: The code works as written in Clojure 1.2 and 1.2.1. It doesn't in 1.3 and later, unless you change the definition of twice to annotate that it is a dynamic var, like so: (defn ^:dynamic twice [x] (println original function) (* 2 x)) With that change, it works in Clojure 1.3 and later. Andy -- 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: Fail to run dynamic binding code with Clojure1.4
Could you please recommend a book that's more up-to-date? On Wednesday, October 31, 2012 11:26:48 AM UTC+8, Sean Corfield wrote: Yes, it's very unfortunate that Manning released Clojure in Action without a final pass to make it Clojure 1.3 compatible. I talked to them about it when they still had time to make changes but they decided to go ahead and publish a book that is tightly wedded to Clojure 1.2 after Clojure 1.3 had been released. I think it was a disservice to both the author and the community :( Sean On Tue, Oct 30, 2012 at 6:36 PM, Andy Fingerhut andy.fi...@gmail.com javascript: wrote: The code works as written in Clojure 1.2 and 1.2.1. It doesn't in 1.3 and later, unless you change the definition of twice to annotate that it is a dynamic var, like so: (defn ^:dynamic twice [x] (println original function) (* 2 x)) With that change, it works in Clojure 1.3 and later. Andy -- 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: Fail to run dynamic binding code with Clojure1.4
Does this mean vars are dynamic by default prior to Clojure1.3, and lexical afterwards? On Wednesday, October 31, 2012 9:36:47 AM UTC+8, Andy Fingerhut wrote: The code works as written in Clojure 1.2 and 1.2.1. It doesn't in 1.3 and later, unless you change the definition of twice to annotate that it is a dynamic var, like so: (defn ^:dynamic twice [x] (println original function) (* 2 x)) With that change, it works in Clojure 1.3 and later. Andy On Oct 30, 2012, at 5:42 PM, Satoru Logic wrote: Hi, all. I am reading Clojure in Action. In the scope section of Chapter3, there are examples like this: defn twice [x] (println original function) (* 2 x)) (defn call-twice [y] (twice y)) (defn with-log [function-to-call log-statement] (fn [ args] (println log-statement) (apply function-to-call args))) (call-twice 10) (binding [twice (with-log twice Calling the twice function)] (call-twice 20)) (call-twice 30) When I tried to run this code in repl, I got the following exception: IllegalStateException Can't dynamically bind non-dynamic var: user/twice clojure.lang.Var.pushThreadBindings (Var.java:353) Is the book wrong or I'm running with the wrong version of clojure? -- 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: Fail to run dynamic binding code with Clojure1.4
On Tue, Oct 30, 2012 at 8:38 PM, Satoru Logic satorulo...@gmail.com wrote: Could you please recommend a book that's more up-to-date? Clojure Programming http://www.clojurebook.com/ would be my first choice. Programming Clojure 2nd Edition http://pragprog.com/book/shcloj2/programming-clojure would be my second choice. The Joy of Clojure http://manning.com/fogus/ is an older book but is more high-level - the why of functional programming - so it's still applicable to more recent Clojure versions, but definitely a book for when you have more Clojure under your belt. -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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: Fail to run dynamic binding code with Clojure1.4
Thanks On Wednesday, October 31, 2012 12:41:24 PM UTC+8, Sean Corfield wrote: On Tue, Oct 30, 2012 at 8:38 PM, Satoru Logic sator...@gmail.comjavascript: wrote: Could you please recommend a book that's more up-to-date? Clojure Programming http://www.clojurebook.com/ would be my first choice. Programming Clojure 2nd Edition http://pragprog.com/book/shcloj2/programming-clojure would be my second choice. The Joy of Clojure http://manning.com/fogus/ is an older book but is more high-level - the why of functional programming - so it's still applicable to more recent Clojure versions, but definitely a book for when you have more Clojure under your belt. -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
