What is the difference between void and Id in objective-c?

Question

Objective-C

As I understand it, they are both used when an undefined type is needed, so what's the difference?

Answer 1

Did you mean void* ?
The difference is that id is a pointer to objective - c objects, while void* is a pointer to an undefined type, or just a memory area (which can store anything).
stackoverflow.com/questions/1304176/objective-c-di...

Answer 2

id is an objective-c object
void is void/nothing in C
void* is a pointer to a variable of unknown type in C
To be more precise, id is a pointer to the object structure in objective-c.
If you are very interested, you can see more details in usr/include/objc/objc.h

/// Represents an instance of a class.
struct objc_object {
    Class isa  OBJC_ISA_AVAILABILITY;
};

/// A pointer to an instance of a class.
typedef struct objc_object *id;

Answer 3

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