int main(int argc, char **argv) {
    QApplication app(argc, argv);
    QToolBar tb;
    auto a = new QAction("TB 1");
    tb.addAction(a);
    a = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::DocumentNew), "TB 2");
    tb.addAction(a);

    a = new QAction("TB 3");
    QMenu* menu = new QMenu;
    menu->addAction("Action 12345678901234567890");
    a->setMenu(menu);
    tb.addAction(a);

    a = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::DocumentNew), "TB 4");
    tb.addAction(a);
    menu = new QMenu;
    menu->addAction("Action 12345678901234567890");
    a->setMenu(menu);
    tb.setToolButtonStyle(Qt::ToolButtonIconOnly);
    //tb.setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
    //tb.setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
    tb.show();
    return app.exec();
}