float 
Point_2D::x()

    CODE:
    RETVAL=THIS->x();
    OUTPUT:
    RETVAL
    
void
Point_2D::set_x(arg)
    float arg
    
    CODE:
    THIS->x(arg);
    
    
void
Point_2D::DESTROY()

    CODE:
    delete THIS;

Point_2D *
Point_2D::new()

    CODE:
    RETVAL = new Point_2D();
    OUTPUT:
    RETVAL