OO Flex

Blessed closures give privacy.
Reblessing to move objects between classes (e.g., a TCP connection responds differently to methods depending on its state, so represent each state as a class and rebless when the object changes state).
Changing @ISA to alter class behaviour is like reblessing to change object behaviour.
Damian Conway will be talking about this and more.

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YAPC 2000: Stages of a Perl Programmer - 41