Pointer to object created in parameter

Question

I have a class called Rectangle which holds two pointers to objects of the class Point2D .

class Rectangle: public GeoObjekt
{
private:
    Point2D* lu;
    Point2D* ro;
public:
    Rectangle(Point2D lu, Point2D ro);
}

Rectangle::Rectangle(Point2D lu, Point2D ro) {
    this->lu = &lu;
    this->ro = &ro;
}

To create an object of this class, I call the following line:

Rectangle rectangle(Point2D(0, 0), Point2D(2, 1));

The constructor is working fine, but when I try to access Point2D* lu; or Point2D* ro; , I get an access violation exception:

Exception thrown at 0xFEDC8589 in Rectangle.exe: 0xC00005: Access violation while executing at position 0xFEDC8589.

I checked it with the debugger and the values inside Point2D* lu; or Point2D* ro; are completely different from the values they initially had. They change after leaving the constructor.

Can someone tell me what I am doing wrong?

Note: The line Rectangle rectangle(Point2D(0, 0), Point2D(2, 1)); should remain as it is.

Answer 1

Change the members lu and ro to be Point2D instead of Point2D* .

The Point2D s you supplied in the constructor are destroyed on the next line, so your pointers end up pointing at nothing (dangling pointers).