Re: Strange behaviour of a callable record
It would be great if the ticket has more of the original use case as motivation. On Thursday, April 23, 2015 at 7:00:51 AM UTC-5, Nicola Mometto wrote: I've opened an enhancement ticket with a patch that changes this behaviour btw: http://dev.clojure.org/jira/browse/CLJ-1715 http://www.google.com/url?q=http%3A%2F%2Fdev.clojure.org%2Fjira%2Fbrowse%2FCLJ-1715sa=Dsntz=1usg=AFQjCNF8bkUYdHtcFlrlNYUWyTHsbg5tRQ Alexey Cherkaev writes: Hi, I have encountered the problem with Clojure 1.6.0, when I create the record that implements IFn. For example, (defrecord Foo [x] clojure.lang.IFn (invoke [_ f] (f x))) Than create an instance of this record: (def f (-Foo 10)) And we can call it without a problem: user= (f inc) 11 Yet, if you try to define a value to keep the result, compiler throws an error: user= (def z (f inc)) CompilerException java.lang.AbstractMethodError, compiling:(form-init4774307052978984831.clj:1:8) There is workaround: create local binding first and then assign the value to a global variable: user= (def z (let [temp (f inc)] temp)) #'user/z user= z 11 Is this a bug or I don't fully understand why you can't do that? Cheers, Alexey -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Strange behaviour of a callable record
Thanks, Nicola! It solved it. When I looked at docs, I couldn't figure out the role of `applyTo`. Well, now I know. On Thursday, April 23, 2015 at 1:47:11 PM UTC+2, Nicola Mometto wrote: You're not implementing IFn.applyTo, you should. Why applyTo is used in the second example while invoke is used in the other cases has to do with implementation details of how def expressions are compiled/evaluated. Alexey Cherkaev writes: Hi, I have encountered the problem with Clojure 1.6.0, when I create the record that implements IFn. For example, (defrecord Foo [x] clojure.lang.IFn (invoke [_ f] (f x))) Than create an instance of this record: (def f (-Foo 10)) And we can call it without a problem: user= (f inc) 11 Yet, if you try to define a value to keep the result, compiler throws an error: user= (def z (f inc)) CompilerException java.lang.AbstractMethodError, compiling:(form-init4774307052978984831.clj:1:8) There is workaround: create local binding first and then assign the value to a global variable: user= (def z (let [temp (f inc)] temp)) #'user/z user= z 11 Is this a bug or I don't fully understand why you can't do that? Cheers, Alexey -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Strange behaviour of a callable record
Hi, I have encountered the problem with Clojure 1.6.0, when I create the record that implements IFn. For example, (defrecord Foo [x] clojure.lang.IFn (invoke [_ f] (f x))) Than create an instance of this record: (def f (-Foo 10)) And we can call it without a problem: user= (f inc) 11 Yet, if you try to define a value to keep the result, compiler throws an error: user= (def z (f inc)) CompilerException java.lang.AbstractMethodError, compiling:(form-init4774307052978984831.clj:1:8) There is workaround: create local binding first and then assign the value to a global variable: user= (def z (let [temp (f inc)] temp)) #'user/z user= z 11 Is this a bug or I don't fully understand why you can't do that? Cheers, Alexey -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Strange behaviour of a callable record
I've opened an enhancement ticket with a patch that changes this behaviour btw: http://dev.clojure.org/jira/browse/CLJ-1715 Alexey Cherkaev writes: Hi, I have encountered the problem with Clojure 1.6.0, when I create the record that implements IFn. For example, (defrecord Foo [x] clojure.lang.IFn (invoke [_ f] (f x))) Than create an instance of this record: (def f (-Foo 10)) And we can call it without a problem: user= (f inc) 11 Yet, if you try to define a value to keep the result, compiler throws an error: user= (def z (f inc)) CompilerException java.lang.AbstractMethodError, compiling:(form-init4774307052978984831.clj:1:8) There is workaround: create local binding first and then assign the value to a global variable: user= (def z (let [temp (f inc)] temp)) #'user/z user= z 11 Is this a bug or I don't fully understand why you can't do that? Cheers, Alexey -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Strange behaviour of a callable record
You're not implementing IFn.applyTo, you should. Why applyTo is used in the second example while invoke is used in the other cases has to do with implementation details of how def expressions are compiled/evaluated. Alexey Cherkaev writes: Hi, I have encountered the problem with Clojure 1.6.0, when I create the record that implements IFn. For example, (defrecord Foo [x] clojure.lang.IFn (invoke [_ f] (f x))) Than create an instance of this record: (def f (-Foo 10)) And we can call it without a problem: user= (f inc) 11 Yet, if you try to define a value to keep the result, compiler throws an error: user= (def z (f inc)) CompilerException java.lang.AbstractMethodError, compiling:(form-init4774307052978984831.clj:1:8) There is workaround: create local binding first and then assign the value to a global variable: user= (def z (let [temp (f inc)] temp)) #'user/z user= z 11 Is this a bug or I don't fully understand why you can't do that? Cheers, Alexey -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
