Signal and slot

Please correct me if I am wrong, my understanding about signal and slot is as long as both objects are derived from Q_OBJECT, and signal/slot are define in their class definition, they can be connected anywhere these objects exist.
For example, I can define all the connections in main.cpp which handles many objects, is that right?

More or less, but its not right to say "objects are derived from Q_OBJECT" as that is a macro definition and not a class - QObject is the class. To use signals/slots you need to have objects which derive from QObject and include the Q_OBJECT macro.

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Originally Posted by JimDaniel

More or less, but its not right to say "objects are derived from Q_OBJECT" as that is a macro definition and not a class - QObject is the class. To use signals/slots you need to have objects which derive from QObject and include the Q_OBJECT macro.

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Thanks, I find Derived from QWidget might be a better idea since it allows using QMessageBox, while QObject does not.

Sure, you can do that. QWidget itself derives from QObject.