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Qt already provides signals and slots for its classes, which you can use in your application For example, QPushButton has a signal clicked() , which will

Transmitting extra data with Qt Signals Modifying widget signals to pass contextual information to slots by Martin Fitzpatrick Last updated 16 An introductory explanation to Qt Signals and Slots mechanism If you are new to using Qt

pp 88 slot C++ Qt 5 In Qt, we have an alternative to the callback technique: We use signals and slots A signal is emitted when a particular event occurs Qt's widgets have many