Coding a Qt slot, how is the signal received?

website qt connect signal to slot with parameter QObject::connect(const QObject * sender , PointerToMemberFunction signal , const QObject * receiver , PointerToMemberFunction slot , Qt:: qt connect signal to slot QObject::connect() can use standard string values for Signal and Slot parameters · QObject::connect() can use standard string values for Signal and a lambda for

qt connect signal to slot with parameter I am seeing connect() with 3 or 4 parameters It looks like the rule is that with 4 parameters, we can get the required type of the 2nd  connect(_a,SIGNAL(someSignal),_b,SLOT(someslot parameter type specifier in someSignal() because if you write it as  If the signal has no parameters

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