call a method from another class

Hi all,

i have difficulty understanding the following :
i have two classes : Point and Rectangle.

Code:

---

class Point // holds x,y coordinates
{


public:
    void SetX(int x) { itsX = x; }
    void SetY(int y) { itsY = y; }
    int GetX()const { return itsX;}
    int GetY()const { return itsY;}
private:
    int itsX;
    int itsY;
};

class Rectangle
 {
 public:
    Rectangle (int top, int left, int bottom, int right);


    ~Rectangle () {}


    Point GetUpperLeft() const { return itsUpperLeft; }
    Point GetLowerLeft() const { return itsLowerLeft; }
    Point GetUpperRight() const { return itsUpperRight; }
    Point GetLowerRight() const { return itsLowerRight; }


    void SetUpperLeft(Point Location) {itsUpperLeft = Location;}
    void SetLowerLeft(Point Location) {itsLowerLeft = Location;}
    void SetUpperRight(Point Location) {itsUpperRight = Location;}
    void SetLowerRight(Point Location) {itsLowerRight = Location;}


 private:
    Point itsUpperLeft;
    Point itsUpperRight;
    Point itsLowerLeft;
    Point itsLowerRight;
 };

int main()
{
        //initialize a local Rectangle variable
    Rectangle MyRectangle (100, 20, 50, 80 );
    std::cout << MyRectangle.GetUpperLeft().GetX();

---

my question is about this :
MyRectangle.GetUpperLeft().GetX()

i know that an object of Point can access a public method of Point.
But here i have a function (method of Rectangle class) from type Point that return a Point object. that's fine...why is this method able to call a method from the class Point ?

so a public method of the class X cannot only be accessed by an X object but also from a function of type X that can return an X object?

It might be easier to think of it in this way, that this:

Code:

---

std::cout << MyRectangle.GetUpperLeft().GetX();

---

is equivalent to:

Code:

---

Point temp = MyRectangle.GetUpperLeft();
std::cout << temp.GetX();

---

Now you can see that "why is this method able to call a method from the class Point ?" doesn't make sense: GetUpperLeft doesn't call GetX.

Ooooh yes it makes sense :)
thanks a lot