#include "Father.h" 
 
class MyFriend{ 
  friend class Quote; //友元类直接这样定义就OK了 
public: 
  MyFriend(){ 
    Father *p = new Father(); 
    p->var1 = 1; 
    p->var2 = 1; 
    p->var3 = 1; 
  } 
  int var1; 
protected: 
  int var2; 
private: 
  int var3; 
}; 

#include "MyFriend.h" 
 
class Father{ 
public: 
  Father(){ 
    MyFriend *p = new MyFriend(); 
    p->var1 = 1; 
    p->var2 = 1; 
    p->var3 = 1; 
  }; 
  int var1; 
protected: 
  int var2; 
private: 
  int var3; 
} 

#include "MyFriend.h" 
 
class Son : Father{ 
  Son(){ 
    MyFriend *p = new MyFriend(); 
    p->var1 = 1; 
    p->var2 = 1; 
    p->var3 = 1; 
  }; 
}