Declare and instantiate a field of this class in your
QObject subclass to declare a signal that takes three
parameters and providing a default value for parameter no. 3.
Declare and instantiate a field of this class in your
QObject subclass to declare a signal that takes three
parameters and providing default values for parameters 2 and 3.
Declare and instantiate a field of this class in your
QObject subclass to declare a signal that takes three
parameters and providing default values for parameters 1 to 3.