Re: boolean java interopt puzzle/bug?!

[Pablo Nussembaum]

Thanks for the help and clarifications. My problem is that I'm working on a tool, as a part of my thesis, to randomly execute annotated java classes to try discover its behavior. So if a class has a (b|B)oolean field and I read its value using reflection it returns (using Field.get()) a Boolean that for clojure will be always false. In order to solve this issue I created the follow fn: (defn- get-val   [^java.lang.reflect.Field f instance]   (let [value (.get f instance)]     (if (instance? java.lang.Boolean value)       (boolean value)       value)))   Thanks and regards, -- Bauna On 10/06/2013 10:57 PM, Andy Fingerhut wrote: There is also this page on ClojureDocs that might shed some light on this quirk:     http://clojuredocs.org/clojure_core/clojure.core/if On Sun, Oct 6, 2013 at 6:14 PM, Rob Browning <r...@defaultvalue.org> wrote: Gary Trakhman <gary.trakh...@gmail.com> writes: > Clojure's false and true are Boolean/FALSE and Boolean/TRUE, and for speed > reasons (I think) anything that checks for truthiness uses java's ==, which > will fail on any new Boolean object.  Usually, this isn't a problem, but > sometimes it is.  You can see that this assumption is pervasive by looking > at the implementations of 'true?' and 'false?', which use identical? and > the check for != Boolean.FALSE in > https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Compiler.java#L2569 ...and further, my understanding is that the Boolean constructors are more or less considered a mistake, and you should effectively never use them.  For example:   http://rayfd.me/2007/01/17/the-evil-boolean-constructors/ Hope this helps -- Rob Browning rlb @defaultvalue.org and @debian.org GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4 -- -- 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/groups/opt_out. -- -- 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/groups/opt_out. -- -- 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/groups/opt_out.