virtual bool delMember (const Tx)=0; virtual Set<T>intersectWith(Set<T>&R)=0; 川集合的交运算 yirtual Set<T>unionWith(Set<T>&R)=0; 川集合的并运算 virtual Set<T>differenceFrom (Set<T>&R)=0; 川集合的差运算 yirtual bool Contains(Tx)=0; virtual bool subSet (Set<T>&R)=0; virtual bool operator ==(Set<T>&R)=0; /判集合是否相等 }; 5virtual bool delMember (const T x) = 0; virtual Set<T> intersectWith (Set<T>& R) = 0; //集合的交运算 virtual Set<T> unionWith (Set<T>& R) = 0; //集合的并运算 virtual Set<T> differenceFrom (Set<T>& R) = 0; //集合的差运算 virtual bool Contains (T x) = 0; virtual bool subSet (Set<T>& R) = 0; virtual bool operator == (Set<T>& R) = 0; //判集合是否相等 }; 5