Question

void SomeClass::mySlot(MyClass *var){
    ...
}

void SomeClass::SomeFunction(){
    MyClass *myVar;
    QPushButton *button = new QPushButton(this);
    connect(button, SIGNAL(clicked()), this, SLOT(mySlot(myVar)));
}

I want mySlot to receive myVar when the button is clicked.
is it possible to do something like that? I don’t want to store myVar pointer in SomeClass.

update (my solution):

void SomeClass::mySlot(){
    QPushButton *button = static_cast<QPushButton*>(sender());  
    MyClass *myVar = qobject_cast<MyClass*>(qvariant_cast<QObject *>(button->property("myVar")));
    ...
}

void SomeClass::SomeFunction(){
    MyClass *myVar;
    QPushButton *button = new QPushButton(this);
    button->setProperty("myVar", QVariant::fromValue((QObject*)myVar));
    connect(button, SIGNAL(clicked()), this, SLOT(mySlot()));
}

Answer 1

No it is not possible. You can use a slot which discard some parameters but not a slot which have more parameters than the signal. Plus you cannot pass a variable when connecting a slot.