Update: don’t miss xdg’s reply, which addresses the issue.

This is an off-the-cuff note that started out as a reply to xdg in Re^2: Slides from NY Inside-Out Talk, where he writes:

I’m pretty indifferent, personally, on advisory versus enforced encapsulation.

I’m not: advisory is better. Being unable to do nasty things necessarily means you also cannot do powerful things. The primary value brought to the table by inside-out objects for me is that subclasses cannot accidentally break encapsulation. I would prefer if they could, iff they so chose; then the OO in Perl 5 would be on par with Ruby.

So far, the choices are:

  1. Encapsulation is advisory and accidentally breakable; subclasses require implementation knowledge of the superclass. (Hash-based and co.)
  2. Encapsulation is enforced; subclasses require implementation knowledge of the superclass. (Closure-based.)
  3. Encapsulation is enforced; subclasses require no implementation knowledge of the superclass. (Inside-out.)

Notably absent, however:

  1. Encapsulation is advisory; subclasses require no implementation knowledge of the superclass.

Makeshifts last the longest.

In reply to OO in Perl 5: still inadequate by Aristotle

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