in reply to I want to write a method that can be used with 'while ($thing = getNextThing() )'

What you need is an iterator. I recommend you read the chapter on iterators in Higher Order Perl.
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Re^2: I want to write a method that can be used with 'while ($thing = getNextThing() )'
by Cody Fendant (Hermit) on Aug 20, 2016 at 11:51 UTC

    Thanks! I've hacked something together but I'll read it now.

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