感觉占用了多余的内存

Question

CMirror_Dot *p1,*p2;
                        p1=p2=new Cmirror_Dot;
  if(buildings[i].planes[j].plane_flag==true)
  {

p1->SetDot(num, visual_dot);                        
p1->SetPlaneDot(plane_first_dot,plane_second_dot); 
num++; if(num==1)
{
mirror_dot.next_rank=p1;
mirror_dot.next_rank->parent=&mirror_dot;           
queue.insert(p1);                                  
}
else
{
p2->next_Dot=p1;
p2->next_Dot->parent=&mirror_dot;             //保存父节点的指针
}
p2=p1;
p1=new CMirror_Dot;                           //生成镜像列表
buildings[i].planes[j].plane_flag=false;      //消除面的标记
  }
}

Answer 1

p2=p1;
p1=new CMirror_Dot; //如果你那段码只执行一次，就可以去掉这句。
buildings[i].planes[j].plane_flag=false;