There is a tiny module that gives a straight answer. Look for Class::CanBeA
Here is an example of how it works:
#!/usr/bin/perl -w
use strict;
use Class::CanBeA;
package Dummy; sub dummy {}; # not inherited
package Foo; sub bar {}; # The ultimate parent
package Bar; use base qw(Foo);
package DeepBar; use base qw(Bar);
package DeeperBar; use base qw(DeepBar);
package Pub; use base qw(Foo);
package DeepPub; use base qw(Pub);
package DeeperPub; use base qw(DeepPub);
my @subclasses = @{Class::CanBeA::subclasses('Foo')};
print "@subclasses\n";
output:
DeepBar Bar DeeperPub Pub DeeperBar DeepPub
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