On Sun, 28 Mar 2004, Eugene van der Pijll wrote:
> Is it possible to detect mixed durations other than checking all of
> is_positive, is_zero and is_negative? For example by adding an is_mixed
> method?
Something like that, with a better name than is_mixed would be good.
Name suggestions, anyone
> You could also change the behaviour of is_positive etc., returning 0 for
> negative or zero, and undef for 'unknown' (mixed durations).
Three state logic is a _huge_ PITA for the end user. See SQL and NULLs if
you want a good example of how bad an idea this is ;)
Nobody wants to write:
my $is_pos = $dur->is_positive;
if ($is_po��s{ ... }
elsif (defined $is_pos) { ... }
else { ... }
-dave
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