c++ vitual继承

class Base
{
public:
    Base(void);
    ~Base(void);
};

Base::Base(void)
{
    printf("Base::Base():%p\n",this);
}

class ChildFirst :
    /*vitual*/ public Base
{
public:
    ChildFirst(void);
    ~ChildFirst(void);
};

ChildFirst::ChildFirst(void)
{
    printf("ChildFirst::ChildFirst()\n");
}

class ChildSencond :
    /* vitrual */public Base
{
public:
    ChildSencond(void);
    ~ChildSencond(void);
};


ChildSencond::ChildSencond(void)
{
    printf("ChildSencond::ChildSencond()\n");
}


class GrandChild :public ChildFirst, ChildSencond
{
public:
    GrandChild(void);
    ~GrandChild(void);
};

GrandChild::GrandChild(void)
{
    printf("GrandChild::GrandChild()\n");
}

int _tmain(int argc, _TCHAR* argv[])
{
    GrandChild grandChild;
    return 0;
}