Thanks for the reply, Nils.
2011/12/1 Nils Bertschinger <nils.bertschin...@googlemail.com>
> Hi Roman,
>
> as far as I understand, the Clojure compiler is doing some
> optimizations for recursive functions to save the variable lookup.
> This means that you have to explicitly write the recursive call as
> (#'fact (dec n)) if you want to dynamically rebind the function.
> Somehow this doesn't feel right for a dynamic language.
> Clojure 1.3, which cannot dynamically rebind variables unless they are
> explicitly marked as ^:dynamic, introduced with-redefs to solve this
> problem. In Clojure 1.3 you're example works as expected if you use
> with-redefs instead of binding in the definition of fact-with-logging.
> In case you can't use Clojure 1.3, you might be able to use the source
> code of with-redefs in order to achieve a similar effect in 1.2.
> Though, I haven't tested it.
>
I upgraded to clojure 1.3 and indeed it works correctly when I use
with-redefs. The only downside is that changes made by with-redefs are
visible in all threads.
Do I understand correct that the only way to hook a recursive function
without affecting other threads is to annotate the function with ^{:dynamic
true} and call it via #'fact?
Roman.
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