In the absence of weak refs, you can use the equivalent of soft references: 

my $TEMPID;
my %TEMPS;

package My::Class::Temps;

sub lookup ($) {
    $TEMPS{+shift}
}

sub new {
    my $self = {};
    $TEMPS{ self->{ID} = ++$TEMPID } = $self;
    $self;
}

[download]

Now you can store $self->{ID} and use lookup() to find the corresponding object. Such storage of a unique ID doesn't increase reference counts, so it's rather like a weak reference, albeit not nearly as convenient.

    -- Chip Salzenberg, Free-Floating Agent of Chaos

In reply to Re: Catching an object going out of scope by chip
in thread Catching an object going out of scope by Masem

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