Alex, I may be unfamiliar with the definitions of truly immutable and effectively immutable being used here, but if I can mutate the contents of a Java Object array that is a final field after an object is constructed, does it really matter that much if it is final? It is trivially easy to mutate using Java access. Here is the example that I mentioned earlier in this thread, copied here for convenience:
user=> (def v [1 2 3]) #'user/v user=> (class v) clojure.lang.PersistentVector user=> v [1 2 3] user=> (aset (.tail v) 1 -2) -2 user=> v [1 -2 3] Andy On Tue, May 6, 2014 at 4:49 PM, Alex Miller <a...@puredanger.com> wrote: > The Clojure persistent data structures are truly immutable - all fields > are final and referred objects are not mutated after construction so that > freeze occurs. One obvious exception are the transient variants ( > http://clojure.org/transients). You can look at the code in > https://github.com/clojure/clojure/tree/master/src/jvm/clojure/lang - any > of the Persistent*.java. > > > On Tuesday, May 6, 2014 4:11:49 PM UTC-5, Mike Fikes wrote: >> >> Are the persistent immutable data structures in Clojure "truly" immutable >> (using final fields, relying on constructor freezing), or are they mean to >> be merely effectively immutable (as defined in JICP)? >> > -- > 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. > -- 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.
