如何调用通过基类指针基类方法指向派生类

Question

class Base 
{ 
    public: 
    virtual void foo() 
    {} 
}; 

class Derived: public Base 
{ 
    public: 
    virtual void foo() 
    {} 
}; 

int main() 
{ 
    Base *pBase = NULL; 
    Base objBase; 
    Derived objDerived; 

    pBase = &objDerived; 
    pBase->foo(); 

    /*Here Derived class foo will be called, but i want this to call 
    a base class foo. Is there any way for this to happen? i.e. through 
    casting or something? */ 
} 

Answer 1

pBase->Base::foo() 

Answer 2

你可以做到这一点通过范围解析操作::

事情是这样的：

pBase->Base::foo() 

Answer 3

上述两个反应是正确的...但要小心，如果你需要这样做，也许你有一个关于概念或设计的大问题...