如何在C++中将多个单选按钮分组为3组？

#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget window;
    QVBoxLayout layout(&window);

    QGroupBox group1("Group 1");
    QGroupBox group2("Group 2");
    QGroupBox group3("Group 3");

    QRadioButton radio1("Option 1");
    QRadioButton radio2("Option 2");
    QRadioButton radio3("Option 3");

    QButtonGroup buttonGroup1;
    QButtonGroup buttonGroup2;
    QButtonGroup buttonGroup3;

    buttonGroup1.addButton(&radio1, 1);
    buttonGroup1.addButton(&radio2, 2);
    buttonGroup2.addButton(&radio3, 3);

    layout.addWidget(&group1);
    layout.addWidget(&group2);
    layout.addWidget(&group3);

    group1.setLayout(new QVBoxLayout);
    group1.layout()->addWidget(&radio1);
    group1.layout()->addWidget(&radio2);

    group2.setLayout(new QVBoxLayout);
    group2.layout()->addWidget(&radio3);

    QObject::connect(&buttonGroup1, QOverload<int>::of(&QButtonGroup::buttonClicked), [](int id) {
        qDebug() << "Group 1: Option" << id << "selected";
    });

    QObject::connect(&buttonGroup2, QOverload<int>::of(&QButtonGroup::buttonClicked), [](int id) {
        qDebug() << "Group 2: Option" << id << "selected";
    });

    QObject::connect(&buttonGroup3, QOverload<int>::of(&QButtonGroup::buttonClicked), [](int id) {
        qDebug() << "Group 3: Option" << id << "selected";
    });

    window.show();

    return app.exec();
}