use strict;
use warnings;
use Scalar::Util qw( refaddr );

sub refaddr_pp {
    return if not ref $_[0];
    return 0 + $_[0];
}

my $obj = bless {}, 'Foo';
my $ref = {};

print 'refaddr    $obj: ', refaddr($obj),    "\n";
print 'refaddr_pp $obj: ', refaddr_pp($obj), "\n\n";
print 'refaddr    $ref: ', refaddr($ref),    "\n";
print 'refaddr_pp $ref: ', refaddr_pp($ref), "\n";