APM: Interesting hash side effect
ezra pagel
ezra at jdba.org
Thu Jan 9 14:59:20 CST 2003
yeah brian, sometimes autovivification is a mixed blessing. this
behavior is discussed in the documentation for exists().
On Thu, 2003-01-09 at 12:45, Brian Michalk wrote:
> I have had a nagging bug that I finally figured out.
> I found that in some cases checking to see if a hash element is defined will
> add to the hash.
> The following line:
> 103 if (defined $self->{keys}{cfg}{$varname}{ref_sub}) {
> will add the hash element, $self->{keys}{cfg}{$varname}. I had to change my
> code to the following in order to get it to work correctly.
>
> 102 if (defined $self->{keys}{cfg}{$varname}) {
> 103 if (defined $self->{keys}{cfg}{$varname}{ref_sub}) {
> 104 return $self->{keys}{cfg}{$varname}{ref_sub};
> 105 }
> 106 } else {
> 107 return undef;
> 108 }
>
> I hope this helps anyone else who cares.
>
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--
======================================================================
Ezra Pagel Software Engineer
Perl/Java/Oracle ezra at jdba.org
Austin Logistics, Inc. epagel at austinlogistics.com
Austin, Texas (512)-651-5644
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