On Thu, Nov 26, 2009 at 05:05:17PM -0800, David Brown wrote:
>On Thu, Nov 26, 2009 at 04:00:34PM -0800, David Brown wrote:
>
>>For now, I'll do without the with-open, since in this particular case,
>>errors are going to be fairly fatal anyway.
>
>BTW, I still haven't been able to figure out how to write this
>function without hanging onto the collection across the call to
>'write-mapping'.
Ugh, I have found a very ugly hack that works.
It seems that the compiler only nulls out locals before a call in the
tail position, even if earlier calls don't reference the value any
more.
So, I went down in my call-chain to the first function that uses the
sequence directly (in a doseq), and do something like this:
(let [real-coll @coll]
(swap! coll (constantly nil))
(doseq [item real-coll] ...))
I just have to wrap the collection in an atom up where I create it,
and make sure I never keep a reference to it around.
David
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