问MI的C++虚表布局(多重继承)

EN

class Base1 {  
public:  
    Base1();  
    virtual ~Base1();  
    virtual void speakClearly();  
    virtual Base1 *clone() const;  
protected:  
    float data_Base1;  
};  

class Base2 {  
public:  
    Base2();  
    virtual ~Base2();  
    virtual void mumble();  
    virtual Base2 *clone() const;  
protected:  
    float data_Base2;  
};  

class Derived : public Base1, public Base2 {  
public:  
    Derived();  
    virtual ~Derived();  
    virtual Derived *clone() const;  
protected:  
    float data_Derived;  
};