Question

I need this info to decide which of the classes with a specific method is being called.

Answer 1

You use the ref builtin to determine the reference type or class of a variable:

my $obj = bless [] => 'Some::Class';

print ref($obj), "\n";  # 'Some::Class';

More detail can be found with Scalar::Util‘s reftype (always returns the container type) and blessed (always returns the class name) subroutines.