in reply to Re: Need help with complex tied data structure
in thread Need help with complex tied data structure

Yes, I saw that. That's why I show the code at the end of my question with the $tmp variable. I tried pointing $tmp to different depths in the data structure, as well as having multiple temporary variables like: 
$tmp = $data[$gid];
$tmp2 = $tmp->{$id};
$tmp2->[$element_num] = $element;

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But none of that seemed to work.

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Re: Need help with complex tied data structure
by Abigail-II (Bishop) on Nov 20, 2003 at 23:34 UTC
    The fragment I posted also stresses out the importance of storing back the modified value in the top level hash. Your code doesn't do that.

    Abigail

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      I see your point. So, then I should do this: 
      $tmp = $data[$gid]->{$id};
$tmp->[$element_num] = $element;
$data[$gid]->{$id} = $tmp;

      [download]
      I haven't tested this yet, but while typing it, I noticed that with the $tmp assignment, that I'm pulling all of @{$data[$gid]->{$id}} into memory, partly obviating the advantage of the disk-based tie. It would make more sense then to generate the entire @{$data[$gid]->{$id}} array in memory and only save it when all the elements are computed. Is that correct?
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[d/l]

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