Problem with signalslot carrying pointer - qt

Code for this video c-tutorialqt In this video we will learn How Qt

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

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

signal and slot arguments are not compatible Does your code ever return to the Qt event loop? Thank you for the answer but I don´t understand you I put the breakpoint in the emit line, and