Is this a bug in Perl (nested hash)?
Alan Stewart
astewart at spawar.navy.mil
Wed Apr 12 14:21:37 CDT 2000
~sdpm~
On 12 Apr 00, at 10:25, John R. Comeau wrote:
> Alan> John, what did yours print? You didn't say !!
>
>Mine printed the same as yours. I guess I was just hoping that the
>keys 'key0' and 'key1' wouldn't be created just by checking for the
>existence of the nested value. I was thinking that only an assignment
>operation would create them.
>
>-John
If $hash{key0} didn't auto set to a reference value, you wouldn't get the free
ride of saying $hash{key0}{key00} without first saying something like:
$hash{$key} = {};
It just happens that there is a new module on the CPAN recent list called
Hash-NoVivify which appears to address this problem of de-referencing inside
exists() causing autovivify. I only took a peek at the readme.
~sdpm~
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