虛表注意display中打印成員變量時需注意（eg:string可能出錯）

    當基類中沒有子類對應虛函數，調試窗口不顯示，需打印出來

//#include<iostream>//using namespace std;//typedef void(*Fun)();//class AA//{//public://  virtual void Fun1()//  {//      cout << "AAFun1()" << endl;//  }//  virtual void Fun2()//  {//      cout << "AAFun2()" << endl;//  }//};//class BB :public AA//{//public://  virtual void Fun1()//  {//      cout << "BBFun1()" << endl;//  }//  virtual void Fun3()//  {//      cout << "BBFun3()" << endl;//  }//  virtual void Fun4()//  {//      cout << "BBFun4()" << endl;//  }//};//void PrintVTable(int* vTable)//{//  for (int i = 0; vTable[i] != 0; ++i)//  {//      Fun f = (Fun)vTable[i];//      f();//  }//}//void Test1()//{//  AA a;//  BB b;//  int* vTable = (int *)*(int*)&a;//  PrintVTable(vTable);////  vTable = (int *)*(int*)&b;//  PrintVTable(vTable);//}