"Three value logic" is of little use when you only have binary control mechanisms.
To be of value, you'd have to have a control structures that had three branches:
Given that about 90% of programmers seem unable to handle the idea of:
It seems unlikely that they'd go for trinary control mechanisms any time soon.
Without them, you'd just end up coding the direct equivalent of:
But in a far more obscure way.
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In reply to Re: A practical use of Logic::Kleene (3-valued logic)