Is id in Objective C is primitive data type

Question

I am bit confused, as my title mentioned,

Is id in Objective C is primitive data type? or Object type? I always thought that id is Object type as it is pointing towards an object.

So, Is it Object type or Primitive data type?

Answer 1

Definitly not a primitive type. From Apple:

In Objective-C, object identifiers are of a distinct data type: id. This type is the general type for any kind of object regardless of class and can be used for instances of a class and for class objects themselves.

Answer 2

id is declared in objc.h as

typedef struct objc_object {
    Class isa;
} *id;

so yes, I'd say it's primitive (pointers are primitive types in C).