Mastering Qt 5

Qt Tutorials For Beginners 5 - Qt Signal and slots qt signal slot When one QObject instance is the receiver of a signal, its thread affinity is checked, and by default the signal is delivered directly as a qt connect signal to slot Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time

qt signal slot The signals and slots mechanism is type safe The signature of a signal must match the signature of the receiving slot