Problem with signalslot carrying pointer - qt

Qt Tutorial => Connecting overloaded signalsslots qt signal and slot 使用Qt的信号和槽（Signals and Slots）机制有以下好处：松耦合：通过信号和槽，对象之间的通信是松耦合的。发送者不需要知道接收者的具体实现细节， qt slot signal If the signal sends data, then the receiving function will receive that data too Many Qt widgets also have their own built-in slots, meaning

qt connect signal to slot with parameter Since Qt uses a mechanism called signals and slots, it makes the callback function weakly coupled to the event Also, we usually use the terms signal and slot