///
/// Returns `true` if the line is not set up with valid start and end point;
/// otherwise returns `false.`
Returns `true` if the line is not set up with valid start and end point;
otherwise returns `false.`
Returns ` true ` if the line is not set up with valid start and end point ; otherwise returns ` false . `
pub fn is_null(&self) -> bool {
        let (obj_data, funcs) = self.get_line_f_obj_funcs();
        unsafe {
            let ret_val = ((*funcs).is_null)(obj_data);
            ret_val
        }
    }
pub fn is_null ( & self ) -> bool { let ( obj_data , funcs ) = self . get_line_f_obj_funcs ( ) ; unsafe { let ret_val = ( ( * funcs ) . is_null ) ( obj_data ) ; ret_val } }
Returns `true` if the line is not set up with valid start and end point;
otherwise returns `false.`
Returns ` true ` if the line is not set up with valid start and end point ; otherwise returns ` false . `
&self