Re: !foo vs foo == nil
Re: !foo vs foo == nil
- Subject: Re: !foo vs foo == nil
- From: "mm w" <email@hidden>
- Date: Wed, 20 Aug 2008 16:52:22 -0700
#define __DARWIN_NULL ((void *)0)
#define nil __DARWIN_NULL
typedef struct objc_object {
Class isa;
} *id;
typedef id (*IMP)(id, SEL, ...);
id is a pointer you just demonstrated that 1 = 1
On Wed, Aug 20, 2008 at 4:42 PM, Jim Puls <email@hidden> wrote:
>>> Just try it out in a small project...
>>>
>>> Keep in mind that Objective-C is the same as C, and C only checks for
>>> numbers within the if() statement...
>>> 0 = false, 1 or more = true...
>>>
>>> nil = 0 so, they mean the same thing...
>>
>> I guess my questions wasn't phrased correctly. The point was more: is
>> 'nil' really the equivalent of 0 or NULL.
>>
>> There was a common perception that NULL is not really the same as nil. But
>> seems like in the end it really is (void*)0.
>>
>> http://cocoawithlove.com/2008/06/doing-things-in-cocoa-with.html
>
> NULL is (void *)0.
> nil is (id)0.
>
> Use one for generic pointers and the other for objects to keep your mind
> sane.
>
> -> jp
>
>
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--
-mmw
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