Question

I am trying to override the = operator so that I can change my Point class into a Vector3 class.

Point tp = p2 - p1;
Vec3 v;
v = tp;

The problem I am facing is that, “v” will have its x,y,z members equal to zero all the time.

Vec3.h:

Vec3 operator =(Point a) const;

Vec3.cpp:

Vec3 Vec3::operator =(Point a) const
    {
        return Vec3(a.x,a.y,a.z);
    }

Thanks for all the help once again 🙂

Answer 1

It’s been a while, but I think you want

Vec3& Vec3::operator=(const Point &a) 
{
    x = a.x; y = a.y; z = a.z;

    return *this;  // Return a reference to myself.
}

Assignment modifies ‘this’, so it can’t be const. It doesn’t return a new Vec3, it modifies an existing one. You will also probably want a copy constructor from Point, that does the same.