This seems like an easy one ... so it's been buggin' me. How do ya pass $object->function to a callback function? If it were in the same package, I would say: 
 $something->set_call_back( \&localfunction );

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How do ya do it if it's ... from $object? I tried this: 
  $something->set_call_back( \$this->func );
  # or
  $something->set_call_back( \&{ $this->func });
  # and
  $something->set_call_back( \( $this->func ) );

[download]
I'll keep pluggin, but I bet it's really obvious...

In reply to function ref by jettero

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