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From: bart <bc@freeuk.com>
Newsgroups: comp.lang.c
Subject: Re: Loops (was Re: do { quit; } else { })
Date: Wed, 23 Apr 2025 18:52:34 +0100
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In-Reply-To: <vub6jt$3i20f$1@dont-email.me>

On 23/04/2025 18:05, David Brown wrote:
> On 23/04/2025 00:02, Keith Thompson wrote:

>> C23 does not have _Lengthof.  It's proposed for C2y.
>>
> 
> Sorry, yes.  The pdf I was viewing was the latest draft for post-C23 
> rather than C23.  My mistake.


Actually, my C compiler has 'lengthof'. I'd got rid of most experimental 
bits in the lastest version, but that got left in:

   #include <stdio.h>

   int main(void) {
       int A[100];

       printf("%zu\n", lengthof(A));              # shows 100
   }

Looking at the sources, it is a sub-operator of 'sizeof' and its 
implementation took under 30 extra lines.

It works for expressions and types, just like sizeof.