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Re^3: What does this mean?

by moritz (Cardinal)
on Aug 21, 2012 at 07:14 UTC ( #988613=note: print w/ replies, xml ) Need Help??

in reply to Re^2: What does this mean?
in thread What does this mean?

$$self{_id} //= $id; checks the definedness of $$self{_id}, not of $id (as the other suggested snippets do), so it does something completely different (never reset the attribute, instead of prevent assignment of an undefined id).

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