自己写的智能指针类

//智能指针类class SmartPt{SmartPt(int* p) : pt(p), use(1){}~SmartPt() {delete pt;}friend class HasPtr;int* pt;size_t use;};class HasPtr{public:HasPtr(int* p, int v):ptr(new SmartPt(p)), val(v) {}HasPtr(const HasPtr& h):ptr(h.ptr), val(h.val) { ++(ptr->use);}~HasPtr(){if (--(ptr->use) < 1)delete ptr;}HasPtr& operator = (const HasPtr& h);SmartPt* get_ptr() const {return ptr;}int get_val() const {return val;}void set_ptr(int* p) {ptr->pt = p;}void set_val(int v) {val = v;}int get_ptr_val() const {return *ptr->pt;}void set_ptr_val(int v) {*ptr->pt = v;}protected:private:SmartPt* ptr;int val;};HasPtr& HasPtr::operator = (const HasPtr& h){++(h.ptr->use);if (--(ptr->use) == 0){delete ptr;}ptr = h.ptr;val = h.val;return *this;}

void testSmartPt(void)  //测试函数{ int* has = new int(12); HasPtr hasPtr1(has, 42); HasPtr hasPtr2(hasPtr1); HasPtr hasPtr3(hasPtr1);}