See points 2, 3 and 8 at http://clojure.org/refs
It is just a way to obtain the change lock of the ref in the dosync
transaction, without rewriting it. The alternative would be to
explicitly modify it to the same value as it was before, which is
potentially wasteful.
One possible case where this
Hi,
When dealing with Clojure ref types, when to use (ensure) ?
Thanks.
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I believe it is to avoid write skew. Check this Wikipedia page:
http://en.m.wikipedia.org/wiki/Snapshot_isolation
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Hi Hussein,
Maybe this StackOverflow QA can help in understanding when to use *ensure*
: Clojure STM ambiguity factor http://stackoverflow.com/a/17197281/519383.
HTH,
Juan
On Thursday, June 19, 2014 10:35:24 AM UTC-3, Hussein B. wrote:
Hi,
When dealing with Clojure ref types, when to use
