Re: pointers in objective-c?

FROM : Ken Thomases
DATE : Fri Aug 01 20:47:56 2008

On Aug 1, 2008, at 1:43 PM, Wayne Shao wrote:

> It seems that every object is a pointer in the sample code I have
> seen.  Is there any distinction between an object and its pointer?
>
> In C++,  C* c; would be an uninitialized pointer. But the following
> line will creates an object with the constructor C().
>
> C c;
>
> It seems that there is no such equivalent syntax in Objective-C.
> objects are created either from factory pattern or  [[A alloc]
> someInitMethod ....];
> so, is it possible to write?
>
> NSString a;
> NSNumber b;


It's possible to get into an esoteric discussion of what's technically 
possible (believe me, it's happened), but the useful answer is: all 
objects in Objective-C are dynamically allocated from the heap.  As 
you observed, you get objects using +alloc... methods (or a 
convenience method which wraps such an allocation).

Cheers,
Ken