using namespace std;
class Base
{
public:
    int ClassID; // Used only by derived classes
    string Name;
    shared_ptr<Base> Parent;  // For TreeCtrl-like hierarchy
}
class DerivedA : public Base
{
public:
    double Length;
    double Width;
    double Height;
}
class DerivedB: public Base
{
public:
    double Radius;
}

class Controller
{
public:
    vector<shared_ptr<Base>> Objects;
    void CreateObject(int class_id, string name, shared_ptr<Base> parent)
    {
        shared_ptr<Base> temp;
        switch(class_id)
        {
        case DERIVEDA: // enum definition assumed
            temp = make_shared<DerivedA>(name, parent); // constructors assumed
            break;
        case DERIVEDB:
            temp = make_shared<DerivedB>(name, parent);
            break;
        }
        Objects.push_back(temp);
    }
}