Yes, there may be a few special cases out there, but largely around transients. The transient case constrains the mutability to a thread so still simplifies the concurrency safety story immensely.
On Tuesday, May 6, 2014 8:44:53 PM UTC-5, Mike Fikes wrote: > > Thanks! > > I initially saw that the count field of ArrayNode (in PersistentHashMap) > is non-final and also mutated in at least one case, and began to question > things. > > But, for that particular example, if that field is only mutated in the > case of editing transients, then for the non-transient case ArrayNode is > effectively immutable but also safely published by any truly immutable data > structures by being referred to in final fields. > > Excellent! I had to look for myself, and now I feel much more comfortable > that Clojure is built upon the bedrock it needs to be :) > > On Tuesday, May 6, 2014 7:49:07 PM UTC-4, Alex Miller 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.
