C++中虚拟函数的内存分配机制

//#include<stdio.h>

#include<iostream>
using namespace std;

class CMem	
{
	
public:
  CMem(){}
public:
  int m_first;
private:
 unsigned char m_second;
 
public :
  void fun1();
  virtual int funOver(){return 1;}
  
};



class CMemSub : public CMem
{

public:
  CMemSub(){}

public:
  int m_three;

private:
  int m_four;
  
public:
  void fun3();
 virtual int funOver(){return 2;}

virtual int fun4(){return 3;}


};


int main()
{  
  CMem a,*pMem;
  CMemSub b;
   pMem = &a;
  printf("%d/n",pMem->funOver());
  
   pMem = &b;
   printf("%d/n",pMem->funOver());

  
	
	return 0;
}