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#include <iostream>#include <memory>using namespace std;class Point{public:    Point() : xval(0),yval(0){};    Point(int x, int y): xval(x), yval(y){};    Point(const Point & p)    {        if(this == &p)            return ;        this->xval = p.x();        this->yval = p.y();    }    int x() const {return xval;};    int y() const {return yval;};    Point& x(int xv)     {         xval = xv;         return *this;    };    Point& y(int yv)     {         yval = yv;         return *this;    };private:    int xval, yval;};class Handle{                       //句柄類(lèi)public:    Handle(): up(new Point){};    Handle(int x,int y): up(new Point(x,y)){};//按創(chuàng  )建Point的方式構造handle，handle->UPoint->Point    Handle(const Point& p): up(new Point(p)){};//創(chuàng  )建Point的副本    Handle(const Handle& h): up(h.up){ /*++up->u;*/ };//此處復制的是handle，但是底層的point對象并未復制，只是引用計數加1    Handle& operator=(const Handle& h)    {        up = h.up;        return *this;    };    ~Handle()    {    };    int x() const{return up->x();};    Handle& x(int xv)    {        up->x(xv);         return *this;    };    int y() const{return up->y();};    Handle& y(int yv)    {        up->y(yv);         return *this;    };    int OutputU()    {        return up.use_count();    }   //輸出引用個(gè)數private:    shared_ptr<Point> up;};int main(){    //Point *p = new Point(8,9);     Point p(8,9);    //Point p1 = p.x(88);    //Point *pp = &p;    Handle h1(1,2);    Handle h2 = h1;        //此處調用的是構造函數Handle(const Handle& h)    h2.x(3).y(4);               //此處的特殊寫(xiě)法是因為寫(xiě)xy函數內返回了對象    Handle h3(5,6);        //此處調用Handle的賦值運算符重載函數Handle& operator=(const Handle& h)    h1 = h3;    Handle h4(p);    Handle h5(h4);    h4.x(7).y(8);    //Handle h5(p1);    //Handle h5 = h4;    cout <<"h1(" << h1.x() <<":"<< h1.y() << "):" << h1.OutputU() <<endl;    cout <<"h2(" << h2.x() <<":"<< h2.y() << "):" << h2.OutputU() <<endl;    cout <<"h3(" << h3.x() <<":"<< h3.y() << "):" << h3.OutputU() <<endl;    cout <<"h4(" << h4.x() <<":"<< h4.y() << "):" << h4.OutputU() <<endl;    cout <<"h5(" << h5.x() <<":"<< h5.y() << "):" << h5.OutputU() <<endl;    //delete pp; //不能這樣，不是用new分配的空間    //cout <<"h5(" << h5.x() <<":"<< h5.y() << "):" << h5.OutputU() <<endl;    cout<<p.x()<<" "<<p.y()<<endl;    //cout<<&p1<<endl;    return 0;}