Qt offers a new event handling system: signal- slot connections. The implementation uses the C++ preprocessor and moc, the Meta Object. Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the . The C++ preprocessor changes or removes the signals, slots , and emit Signals and Slots · Small Example · Slots · Meta-Object Information. Yes, just like regular c++ pure virtual methods. The code generated by MOC does call the pure virtual slots, but that's ok since the base class can't. Join the Stack Overflow Community. However, as slots, they can be invoked by any component, regardless of its access level, via a signal-slot connection. How do ohne registrierung and slots work? All classes that inherit from QObject or one of its subclasses e. This example uses boost:: This is true information encapsulation, and ensures that the object can be used as a software component.