On Jan 10, 6:21 pm, Dragan Djuric <draga...@gmail.com> wrote: > Is this on purpose (and what is the reason), or it's just that nobody > thought that would be useful? > > Of course, I am talking about the read-only access to the history. [snip...]
To minimize memory consumption, refs only keep history if it is needed by "pending" transactions, although you can force keeping history with :min-history, see (doc ref). If you want to store some history you can do it manually by attaching a watcher: user> (def a (ref 1)) #'user/a user> (def a-hist (atom [])) #'user/a-hist user> (add-watch a :a-watch (fn [key aref old nw] (swap! a-hist conj old))) #<r...@4369a50b: 1> user> (dosync (alter a inc)) 2 user> (dosync (alter a inc)) 3 user> @a-hist [1 2] user> @a 3 user> /Karl
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