Hi!
The RFC is at http://wiki.php.net/rfc/comparable, and the patch at
http://www.adamharvey.name/patches/comparable.diff.txt. Any and all
feedback welcome, particularly since I'm still learning my way around
the innards of the Zend Engine, and it's entirely possible (indeed,
likely) that I've overlooked something obvious.
It is not clear from the RFC, if the engine encounters $a <= $b, what
actually happens?
E.g.:
1. Is only $a checked for Comparable or also $b?
2. How it is ensured that if $a < $b then $b > $a?
3. Would sorting work with it?
4. If both $a and $b are objects with different compare functions, how
it is determined whose function is used? Note that operators like == are
assumed to be commutative, and less/more operators are assumed to be
commutative in pairs, like above.
As a side note, if we have traits we might instead think of having
Comparable trait or interface or both, which would declare having
compareTo() standard feature (as Java does) without messing with the
engine and overloading operators. Surely, it would be more verbose, but
that might be a good thing.
--
Stanislav Malyshev, Software Architect
SugarCRM: http://www.sugarcrm.com/
(408)454-6900 ext. 227
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