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Re: Who's referencing my variables?

by tobyink (Abbot)
on Apr 01, 2014 at 12:19 UTC ( #1080541=note: print w/replies, xml ) Need Help??

in reply to Who's referencing my variables?

They are probably not being referenced from the synbol table, but rather they're being referenced from other lexical variables.

use 5.010; use strict; use warnings; END { say "Finished script; start of global clean-up" }; { package noisy; use overload q[""] => sub { $_[0][0] }; sub DESTROY { say "$_[0] is being cleaned up" } } # Simple { my $a = bless ['$a'], "noisy"; say "defined $a"; } # $a gets cleaned up # Linear refs { my $b = bless ['$b'], "noisy"; my $c = bless ['$c', $b], "noisy"; # refers to $b my $d = bless ['$d', $c], "noisy"; # refers to $c say "defined $b, $c, and $d"; } # $b, $c, $d get cleaned up # Circular refs { my $e = bless ['$e'], "noisy"; # we'll make this refer to $g soon +! my $f = bless ['$f', $e], "noisy"; # refers to $e my $g = bless ['$g', $f], "noisy"; # refers to $f push @$e, $g; # create reference cycle say "defined $e, $f, and $g"; } # $e, $f, $g cannot be cleaned up
use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name

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