Quit action for a Qt application with a Do not ask again checkbox

gistfile1.txt

void MainWindow::on_actionQuit_triggered()
{
    bool exit = false;
    QSettings settings;
    if (settings.value("quitWithoutPrompt").toBool()) {
        exit = true;
    } else {
        QMessageBox quitQuestion;
        QCheckBox checkBox;
        checkBox.setText(tr("Do not ask again"));
        quitQuestion.setCheckBox(&checkBox);
        quitQuestion.setText(tr("Do you really want to exit this program?"));
        quitQuestion.setWindowTitle(tr("Are you sure?"));
        quitQuestion.setStandardButtons(QMessageBox::No	| QMessageBox::Yes);
        quitQuestion.setDefaultButton(QMessageBox::No);
        quitQuestion.exec();
        if (quitQuestion.result() == QMessageBox::Yes) {
            settings.setValue("quitWithoutPrompt", checkBox.isChecked());
            exit = true;
        }
    }

    if (exit)
        QCoreApplication::quit();
}