Connecting signal and slot by name

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I am currently using this code to connect them by name and it actually works, is this the supported way of doing so?

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QPushButton b;
    b.show();
 
    // connect
    b.connect(&b, "2clicked()", &app, "1quit()");
 
    // disconnect
    b.disconnect(&app, "1quit()");
 
    return app.exec();
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QPushButton b;
    b.show();

    // connect
    b.connect(&b, "2clicked()", &app, "1quit()");

    // disconnect
    b.disconnect(&app, "1quit()");

    return app.exec();
}

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The reason I am doing this is because I want to be able to save/load actions using xml file.