If you pass $a and $b explicitly, you might be able to reuse that sub outside of sort. The "efficiency" of the implicit $a and $b is not really a big deal.

$obj->_compare($a,$b)

In reply to Re^3: Sort mechanics problems with objects and potentially contradicting comparisons (would cause infinite loop) by Anonymous Monk
in thread Sort mechanics problems with objects and potentially contradicting comparisons (would cause infinite loop) by anonymized user 468275

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