集合上的C ++ / CX属性抛出错误

Question

I have a class:

ref class Coord
{
public:
    property float X {
        float get() { return X; }
        void set( float value ) 
            { 
                X = value; // THROWS EXCEPTION
            }
    };
    property float Y {
        float get() { return Y; }
        void set( float value ) { Y = value; }
    };
    property float Z {
        float get() { return Z; }
        void set( float value ) { Z = value; }
    };
};

I make a new copy of it:

Coord^ playerRotation = ref new Coord();

I try to set one of the properties' values:

playerRotation->X = 0.0f;

It runs to this part of my class code:

X = value; // THROWS EXCEPTION

and throws an exception:

Unhandled exception at 0x00115299 in Game.exe: 0xC00000FD: Stack overflow (parameters: 0x00000001, 0x008E2FD0).

What am I doing wrong with the C++/CX properties

Answer 1

I don't know much about C++/CX, but guessing from the error message

Stack overflow

doing X = value; is actually calling X::set() which in turn does X = value; ... you go into an infinite loop and thus causes a stack overflow.

Based on the documentation , you need to define a backing store variable for property X .

ref class Coord
{
    float m_x;   // Backing store for property X

public:
    property float X {
        float get() { return m_x; }
        void set( float value ) 
            { 
                m_x = value;
            }
    };
...

You might also want to do the same for property Y and property Z .