Performance comparison of the Qt Signals and Slots mechanism

QT signalslot alternative signal and slot qt When the signal is emitted with fewer arguments than the slot, Qt runs the slot using default parameter values Functor-based connections do not support signal and slot arguments are not compatible Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal Qt's signals and slots mechanism

signal slot All classes that inherit from QObject or one of its subclasses, like QWidget can contain signals and slots Signals are emitted by objects when they change