On Fri, Mar 11, 2011 at 3:54 AM, Tassilo Horn <[email protected]> wrote: > Ken Wesson <[email protected]> writes: > > Hi Ken & Alan, > >> Adding metadata to an object produces a new object, rather than >> altering the existing object. Every time you increment the counter >> for a function in p it becomes different, and the memoize treats it as >> new. > > Then I've misread that statement on the homepage: > > An important thing to understand about metadata is that it is not > considered to be part of the value of an object. As such, metadata > does not impact equality (or hash codes). Two objects that differ only > in metadata are equal
Actually, that statement is itself a bit misleading and should be clarified. Collections and other things with value-equality semantics are equal if they only differ on metadata, but things like functions that use object identity in the heap as their equality test are not. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. 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
