Special cases

• If we omit line 170, then observers of Class::Observable are not considered observers of Alarm

• But nobody was going to add an observer to Class::Observable anyway

• Or if they did, why shouldn't it observe all the derived objects?

• In fact, such a mechanism might be useful for debugging

  • Possibly more useful than all that ->observer_log stuff

• So why go out of our way to rule it out?

• Avoid special cases

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Copyright © 2006 M. J. Dominus