Re: !foo vs foo == nil
Re: !foo vs foo == nil
- Subject: Re: !foo vs foo == nil
- From: "Clark Cox" <email@hidden>
- Date: Wed, 20 Aug 2008 17:19:37 -0700
On Wed, Aug 20, 2008 at 5:07 PM, mm w <email@hidden> wrote:
> as Mike and me pointed NULL === NULL
> but Im yet not alright with
>
> (!foo) === if(foo == nil)
if(!foo) and if(foo == nil) are 100% identical as far as the language
is concerned. Trust me.
>
> as I sent previously
How is this related to your question?
> #include <stdio.h>
> #include <stdlib.h>
>
> int main(void) {
> char *p1;
p1 is uninitialized, and has an indeterminate value...
> char *p2 = NULL;
>
> free(p1);
... so this free call is undefined behavior (and will likely crash)
>
> free(p2);
>
> return 0;
> }
--
Clark S. Cox III
email@hidden
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