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qtsignals-slots

QSocketNotifier signal has a different signature than the assigned slot

How can the QSocketNotifier signal i.e. activated have a different signature than the assigned slot in the following code

connect(my_skt_read_notifier, SIGNAL(activated(int)), this, SLOT(skt_process_rcv()));

I had the impression that signals and slots should have the same signature, is that right?

what does the int parameter in the notifier indicate?

Solution

  • From the Qt docs:

    The signature of a signal must match the signature of the receiving slot. (In fact a slot may have a shorter signature than the signal it receives because it can ignore extra arguments.)...

    So, in your case it should also work because the slot has less arguments than the connected signal.