dynamic_cast

今天發現dynamic_cast能夠不止爲具備繼續關係的類cast,還能夠這樣用：

 

 

// TestDynamic.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include <iostream>

class ICanFly
{
public:
 virtual ~ICanFly(){}
 virtual void Fly() = 0;
};

class ICanSwim
{
public:
 virtual ~ICanSwim(){}
 virtual void Swim() = 0;
};

class SuperMan: public ICanFly, public ICanSwim
{
public:
 virtual void Fly()
 {
  std::cout << "Fly" << std::endl;
 }

 virtual void Swim()
 {
  std::cout << "Swim" << std::endl;
 }
};

int _tmain(int argc, _TCHAR* argv[])
{
 ICanFly* pICanFly = new SuperMan();
 ICanSwim* pICanSwim = dynamic_cast<ICanSwim*>(pICanFly);

 pICanFly->Fly();
 pICanSwim->Swim();

 delete pICanFly;

 return 0; }