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There is a discussion on

http://stackoverflow.com/questions/1332015/using-class-specific-set-new-handler/1332080#1332080

When operator new cannot satisfy a request for memory, it calls the new-handler function not once, but repeatedly unTIL it can find enough memory.

The handler can use do one of the following:

A way to remove a certain layer form a UIView’s layers

Summary:

• deleting a null pointer is always safe
• Do not delete a pointer that was passed into a class in the first place