The following code is copied directly from Class::WeakSingleton's test.pl. I only care about this for testing so I know that I'm getting the same object when I expect to and not when I don't. I think I'll just put in an object counter and compare *that* since everything else would involve gyrations it seems.

Added: adrianh said I wasn't clear about what this code shows. If I had a way of comparing past object identity with present objects then I could assert $s1_addr != Class::WeakSingleton->instnace. It turns out that there's a much easier solution which just has me assigning a unique value to each object (just a $counter++) so I can determine identity in the case for my specific problem. The general case may not be solvable.

{
    my %h;
    {
        # call Class::WeakSingleton->instance() twice and expect to ge
+t the same
        # reference returned on both occasions.
        my $s1 = Class::WeakSingleton->instance();
        my $s2 = Class::WeakSingleton->instance();

        ok( $s1 == $s2 ); # Test 4
        ok( $s1 == Class::WeakSingleton->instance );
        ok( $Class::WeakSingleton::_instance == $s1 ); # Test 5

        $h{test} = $s1;
    }

    ok( $Class::WeakSingleton::_instance ); # Test 6
}
ok( not defined $Class::WeakSingleton::_instance ); # Test 7

{
    {
        # call MySingleton->instance() twice and expect to get the sam
+e
        # reference returned on both occasions.

        my $s3 = DerivedSingleton->instance();
        my $s4 = DerivedSingleton->instance();
        $s5 = DerivedSingleton->instance;

        ok( $s3 == $s4 );
        ok( $s4 == $s5 );
    }

    ok( $s5 == DerivedSingleton->instance );
    undef $s5;

    ok( not $DerivedSingleton::_instance );
}
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