如何調用通過基類指針基類方法指向派生類

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

你可以做到這一點通過範圍解析操作::

事情是這樣的：

pBase->Base::foo() 

Answer 3

上述兩個反應是正確的...但要小心，如果你需要這樣做，也許你有一個關於概念或設計的大問題...