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"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:

if( <condition> ) { ... } else { ... } otherwise { } my $var = <COND> ? $a :: $b :: $c;

Given that about 90% of programmers seem unable to handle the idea of:

unless( <cond> ) { ... } else { ... }

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:

if( $loginAttempted ) { if( $loginSuccessful ) { ... } else { ... } } else { ... }

But in a far more obscure way.


Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: A practical use of Logic::Kleene (3-valued logic) by BrowserUk
in thread A practical use of Logic::Kleene (3-valued logic) by metaperl

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