How to quit qml safely?

[sonicss]

Hello all:
In my application（arm device）, the software can be reboot by user. There is my question: when the user click the reboot button, the onClick call the function in c++ to finish the job and reboot the device. but How to quit or exit qm safely？
I use QQmlApplicationEngine to load my qml files, below is the code

QQmlApplicationEngine engine;
    const QUrl url(QStringLiteral("qrc:/Main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);

I read the help file, QQmlApplicationEngine has exit an quit signal

[signal] void QQmlEngine::quit()
This signal is emitted when the QML loaded by the engine would like to quit.
See also exit().

How to quit engine?

[sierdzio]

Qt.quit()
// or
Qt.exit(someCode)

https://doc.qt.io/qt-5/qml-qtqml-qt.html#exit-method

[sierdzio]

Qt.quit()
// or
Qt.exit(someCode)

https://doc.qt.io/qt-5/qml-qtqml-qt.html#exit-method

[sonicss]

@sierdzio tks a lot, I'll try it.