How to check if CGVector is nil?

Question

I'm curious how I would use an if statement to see if a CGVector variable is nil, as objects are done like so:

if (!object){

    //Do This

}

But with CGVector it's not an object (As I know of). How would I determine if my CGVector variable is nil?

`CGVector` is a `struct`. See there:http://stackoverflow.com/questions/2414809/default-value-of-an-objective-c-struct-and-how-to-test (for pointer explanation). Maybe you need to check: `if(yourVector.dx == 0 && yourVector.dy == 0)` instead. — Larme, May 07 '14 at 10:54

score 1 · Accepted Answer · edited May 23 '17 at 12:28

1

As you know it is a struct not an object

struct CGVector {
   CGFloat dx;
   CGFloat dy;
};
typedef struct CGVector CGVector;

Edit:

There is no such thing to check if a struct is nil.

Even if you check with dx==0 and dy==0, this is not correct at all an {0,0} is still a valid vector point.

edited May 23 '17 at 12:28

Community

answered May 07 '14 at 10:56

Anoop Vaidya

1 Answers1