Can a new class inherit directly from QObject?

Can a new class inherit directly from QObject? I define a new class and found it cannot inherit from QObject, the complier will report an error:undefined reference to vtable for XX cannot be compiled correctly. you can inherit directly from QObject. If you class implements signals or slots you must provide Q_OBJECT macro in provate […]

How to send retain to match in autorelease pool?

How to send retain to match in autorelease pool? Sending retain to match within the autorelease pool block the and sending autorelease to it after the autorelease pool block extends the lifetime of match and allows it to receive messages outside the loop and be returned to the invoker of findMatchingObject:. Each thread in a […]

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