C++ 中dynamic_cast＜＞的使用方法小结

#include <iostream>
using namespace std;

class CBasic
{
public:
     virtual int test(){return 0;} // 一定要是 virtual
};

class CDerived : public CBasic
{
public:
     virtual int test(){    return 1;}
};

int main()
{
     CBasic        cBasic;
     CDerived    cDerived;

     CBasic * pB1=new CBasic;
     CBasic * pB2=new CDerived;

     //dynamic cast failed, so pD1 is null.
     CDerived * pD1=dynamic_cast<CDerived * > (pB1);   

     //dynamic cast succeeded, so pD2 points to  CDerived object                                        
     CDerived * pD2=dynamic_cast<CDerived * > (pB2);   

     //dynamci cast failed, so throw an exception.            
//    CDerived & rD1=dynamic_cast<CDerived &> (*pB1);   

//dynamic cast succeeded, so rD2 references to CDerived object.
     CDerived & rD2=dynamic_cast<CDerived &> (*pB2);   

     return 0;
}