SPUG: code reference callback on a class method

[SPUG-list-owner]

How do you do a callback on a class method?  For
example:

Zub process_files {
  my $self = shift;
  # stuff
}

Zub process {
  my $self = shift;
  find(\&process_files, @ARGV);
}

I'm trying to get the first argument of find() to be a
callback using $self->process_files()

I went to the books on subroutines and references, but
I'm stuck.  Any help would be greatly appreciated. 
Thank you!

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