Add a cancellation callback to OperationObserver #31
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MarkQSchultz
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Nov 25, 2015
Add a cancellation callback to OperationObserver
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This makes it much easier for an
Operationsubclass to react to cancellation. If you were to overridecancel(), you'd have to account for the possibility that the method may be called multiple times. By using a cancellation observer, you don't.