C++浅析——虚函数的动态和静态绑定

源自一道面试题，觉得很有意思

class CBase
{
public:
        virtual        void PrintData(int nData = 111);
};
void        CBase::PrintData(int nData /* = 111 */)
{
        printf("CBase::PrintData, nData = %d\n", nData);
}

class CDerived : public CBase
{
public:
        void PrintData(int nData = 222);
};
void        CDerived::PrintData(int nData /* = 111 */)
{
        printf("CDerived::PrintData, nData = %d\n", nData);
}

在main()中做如下调用：

 CDerived        oCDerived;
 CBase*        pCBase = (CBase*)&oCDerived;
        
 pCBase->PrintData();
(*pCBase).PrintData();
 oCDerived.PrintData();

大家先猜猜输出结果是什么？

是不是更奇怪，我们看看反汇编的代码：

14、oCDerived.PrintData();
push        0DEh
lea