A little thing. I have a base class and a subclass of the base class. In the base class is a method 'foo'. How can my method 'foo', when called on an object of the subclass, find the location on disk of the file with the subclass code?

use BaseClass; # has the 'foo' method
use SubClass;  # isa BaseClass

my $obj = SubClass->new; 

$obj->foo; # foo needs to know full path to SubClass.pm
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Cheers.