QVariant强制转换为基本类型

我有这样的课：

class QObjectDerived : public QObject
{
    Q_OBJECT
    // ...
};
Q_DECLARE_METATYPE(QObjectDerived*)

当此类存储到QVariant时，会发生这种情况

  QObjectDerived *object = new QObjectDerived(this);
  QVariant variant = QVariant::fromValue(object);
  qDebug() << variant;                          // prints QVariant(QObjectDerived*, )
  qDebug() << variant.value<QObject*>();        // prints QObject(0x0)
  qDebug() << variant.value<QObjectDerived*>(); // QObjectDerived(0x8c491c8)

  variant = QVariant::fromValue(static_cast<QObject*>(object));
  qDebug() << variant;                          // prints QVariant(QObject*, QObjectDerived(0x8c491c8) )
  qDebug() << variant.value<QObject*>();        // prints QObjectDerived(0x8c491c8)
  qDebug() << variant.value<QObjectDerived*>(); // QObject(0x0)

有什么方法可以将其存储在QVariant中并能够将其获取为QObject *和QObjectDerived *吗？