The example demonstrates that your interpretation is exactly what occurs, as described in CFB&T. It is just not what I thought was happening from reading all of the other Clojure books! Alan
On Tue, Nov 3, 2015 at 10:00 PM, Sean Corfield <s...@corfield.org> wrote: > > So, when using commute the update function is ALWAYS run TWICE! Holey > Bovine, Batman! > > > The docs for commute say: > > clojure.core/commute > > ([ref fun & args]) > > Must be called in a transaction. Sets the in-transaction-value of > > ref to: > > > (apply fun in-transaction-value-of-ref args) > > > and returns the in-transaction-value of ref. > > > At the commit point of the transaction, sets the value of ref to be: > > > (apply fun most-recently-committed-value-of-ref args) > > > Thus fun should be commutative, or, failing that, you must accept > > last-one-in-wins behavior. commute allows for more concurrency than > > ref-set. > > That seems to indicate that fun will be called twice: once to set the > *in-transaction-value* of the ref and a second time at the commit point. > Or am I misreading the docstring? > > Sean > > -- > 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.
