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How can an object know when another object has gone away?

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How can an object know when another object has gone away?

Subject: How can an object know when another object has gone away?
From: "James W. Walker" <email@hidden>
Date: Sun, 15 Jun 2008 15:20:39 -0700

Is there a standard Cocoa design pattern or idiom to have an object find out when another object has been destroyed? In PowerPlant, I'd use LBroadcaster and LListener, with the listener listening for msg_BroadcasterDied.

Here's my specific situation. I have several controllers that can create tasks, using an NSTask wrapper based on the Moriarty sample. When a task completes, it sends a message to the controller that created it. If the controller dies before the task completes, I'd like to abort the task. But I'd prefer not to have the controllers explicitly keep track of all their tasks. _______________________________________________

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