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From: David Brown <david.brown@hesbynett.no>
Newsgroups: comp.lang.c
Subject: Re: C23 thoughts and opinions
Date: Fri, 24 May 2024 16:50:28 +0200
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On 24/05/2024 01:05, Chris M. Thomasson wrote:
> On 5/23/2024 6:35 AM, David Brown wrote:
>> On 22/05/2024 23:24, Chris M. Thomasson wrote:
>>> On 5/22/2024 9:55 AM, David Brown wrote:
>>>> In an attempt to bring some topicality to the group, has anyone 
>>>> started using, or considering, C23 ?  There's quite a lot of change 
>>>> in it, especially compared to the minor changes in C17.
>>>
>>> Love the way std::vectors respect alignas... C++20, iirc?
>>>
>>> [...]
>>
>> I have no idea what you are talking about.
> 
> std::vector actually respects alignas, on MSVC at least. I did not know 
> this worked until I tried it. Iirc, Bonita was the one that sparked my 
> test. It aligned itself on the proper boundaries. Very nice.
> 
>> But did you notice that this is c.l.c, not c.l.c++, and the topic is 
>> C23, not C++23 ?  Discussing comparisons or compatibility with C++ is 
>> fair enough, but talking about pure C++ matters (such as 
>> std::vector<>) is unlikely to be helpful.
> 
> C has it as well... Very useful!

I know C has alignas (now as a keyword in C23, instead of just _Alignas 
from C11).

I know C++ has alignas (from C++11 onwards).

What I don't understand is why you think std::vector<> "respects 
alignas" in C++20 - alignment for std::vector<> works like alignment for 
any other class in C++, and always has done.

And what I /really/ don't understand is why you think it is remotely 
relevant here?  Even "alignas" in C is not particular relevant to this 
thread, except that it has become a keyword in C23 instead of a macro 
defined to _Alignas in <stdalign.h>.

Perhaps I should just be grateful for the small mercy of there being no 
random youtube link in your post.