On Mon, 10 Aug 2020, 23:37 Uecker, Martin via Liaison, <
liaison_at_[hidden]> wrote:

>
> Hi all,
>
> I recently proposed changes to the C grammar which got
> voted into C2X by WG14 (N2508, also see N2496).
>
> This allows placing of labels everywhere in a compound
> statement, even before declarations and at the end
> of a block, which was not possible in C so far.
>
> Example:
>
> {
> start:
> int i;
> mid:
> int j;
> end:
> }
>
> It has been pointed out to me that while C++ allows
> labels before declarations, it does not allow them
> at the end of a compound statement.
>
> I plan to propose a change to C++ to make this
> possible too and I wonder if you have any comments
> or suggestions related to this?
>

Superficially this seems like a fairly minor quality of life improvement.
But what about this:

{
if (a)
label:
}

Does the if-statement end after the label? Or is that still a parse error?
Neither option seems particularly nice to me.

Another (old) difference between C is that in C++ you
> can use declarations everywhere where statements are
> allowed, which includes with iteration, control, and
> jump statements.
>
> if (1)
> int i;
>
> This does not make too much sense in the context
> of C, so I do not think we will adopt this.
>
> Best,
> Martin
> _______________________________________________
> Liaison mailing list
> Liaison_at_[hidden]
> Subscription: https://lists.isocpp.org/mailman/listinfo.cgi/liaison
> Searchable archives: http://lists.isocpp.org/liaison/2020/08/index.php
>