Using QPointF in QShareData class

I am writing my class that uses QPointF. I want to use implicit sharing:

Code:

---

class GeometryLineItemData : public QSharedData {
    public:
        GeometryLineItemData();
        GeometryLineItemData(const GeometryLineItemData &other);
        ~GeometryLineItemData();
 
        QPointF p1;
        QPointF p2;
    };

---

My question is: Is it safe to use one class that uses implicit sharing in another implicitly shared class? Should I in copy constructor explicitly initialize points, or leave that like it is QT documentary written (although I think they were talking only about simple types)