'for' is not recommended for causing side-effects. Since you are not using
the return value of the for comprehension, the lazy sequence is not getting
realised. You can either use 'doall' around it or better still, use 'doseq'.
Hope that helps.
Regards,
BG
---
Sent from phone. Please excuse brevity.
On Jun 16, 2011 9:41 PM, "Thomas" <th.vanderv...@gmail.com> wrote:
> Hi All,
>
> I have a ref with a watcher on it, and I call another function from
> the
> watch function. I can see that call happens, but the for construct
> doesn't
> seem to run. Any idea why this is? Am I doing something wrong?
>
> Here is a simplified version of the code:
>
>
> (def numbers (ref #{1 2 3 4 5 6 7 8 9}))
>
> (defn more-actions
> [col]
> (println "this prints" )
> (for [x (range 10)] (println "this doesn't print" col x)))
>
> (defn watcher
> [akey aref old-val new-val]
> (println "new value:" new-val)
> (more-actions new-val)
> )
>
> (add-watch numbers "foo" watcher)
>
> (dosync (alter numbers disj 1))
>
>
> Thanks in advance,
> Thomas
>
> ps. I am running 1.2.1
>
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