Or am I missing something?
Not really. You would have to modify it only slightly to allow argument passing. The big difference is that with:
$obj_merged->bark( 'mailman' );
You get the benefit of not having to remember how many/which objects (which could be of different classes) are in the merged object. It also becomes a heck of a lot easier depending on how many times you want to bark at the moon. This is why I do not think my second example would be desireable to the person asking either.
Keep in mind I am not suggesting a new module for CPAN by any stretch of the imagination - just something to help someone who asked.
Cheers - L~R
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