qt: How to add a list of QActions to QMenu and handle them with a single slot?

You can associate an index (or any other data) to each action when they are created with QAction::setData and connect the signal QMenu::triggered(QAction*) to your slot.

You'll then be able to retrieve the data through the QAction::data() function of your slot parameter.

MyClass::MyClass() {
    // menu creation
    for(...) {
        QAction *action = ...;
        action->setData(10);
        ...
        menu->addAction(action);
    }
    // only one single signal connection
    connect(menu, SIGNAL(triggered(QAction*)), this, SLOT(mySlot(QAction*)));
}

void MyClass::mySlot(QAction *action) {
   int value = action->data().toInt();

}

Other methods: signal mapping or the use of sender(), are explained in that article of Qt Quaterly.