Check if NSRect is null

I'm not able to check if a NSRect structure has a value.

if(!myRect)// produce an error
if(myRect== nil) //this's not a 开发者_运维问答pointer...can't works.

Which is the correct way ?

I think the NSIsEmptyRect function is more comfortable, right?
If you just want to check with the zero rect.

An NSRect is a struct, not a pointer, and therefor it can't be nil or NULL. You can however check if a rect is equal to NSZeroRect with if(NSEqualRects(myRect, NSZeroRect)).