Declare and instantiate a field of this class in your
QObject subclass to declare a signal that takes four
parameters and providing default values for parameters 3 and 4.
Declare and instantiate a field of this class in your
QObject subclass to declare a signal that takes four
parameters and providing default values for parameters 2 to 4.
Declare and instantiate a field of this class in your
QObject subclass to declare a signal that takes four
parameters and providing default values for parameters 1 to 4.