Comparing references is a stable and well-defined operation: 
if ( $thisref eq $thatref ) {
  # these are two refs address the same object, whatever it is
}

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(update: as diotalevi has pointed out, the "==" comparison would be more efficient that the "eq", but otherwise the results are equivalent.)

In reply to Re: Re: Comparing references to sub's by graff
in thread Comparing references to sub's by leriksen

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