数据结构c＋＋语言描述的源代码

				
				#ifndef Object_
				#define Object_
				
				class Object {
				   friend int Knapsack(int *, int *, int, int);
				   public:
				      int operator				      {return (d >= a.d);}
				   private:
				      int ID;  // object identifier
				      float d; // profit density
				};
				
				#endif