Philipp,

on Mon, 26 Apr 2021 20:05:25 +0200 you (Philipp Klaus Krause via
Liaison <liaison_at_[hidden]>) wrote:

> Am 26.04.21 um 13:18 schrieb Jens Maurer via Liaison:
> >>
> >> postfix-expression [ expression ]
> >>
> >> to
> >>
> >> postfix-expression [ assignment-expression ]
> >>
> >> Such a change would be better in line with the function operator,
> >> for example, that also only has assignment-expression, here.
> >
> > Sounds good, if WG14 is happy with the backward compatibility break
> > here.
>
> Making formerly correct code (i.e. using a comma operator in a array
> index) illegal for something that as far as I see, basically is just
> syntactic sugar (a[i,j] vs a[i][j]) doesn't look like something
> WG14-like to me.

My argument would basically not be that it would be preparing for
multi-indices (yes that's just syntactic surgar from a POV of C) but
to catch bugs. As said, many compilers warn on that, anyhow, so this
seems to be a commonly acknowledged loop hole.

I would propose to think about selection statements and maybe
iteration statements at the same time. Here also we have "expression"
as the controlling expression. If we could just use
"condional-expression" for these? That would avoid our users the
hussle with simple assignment that is taken for an equality operator
and a comma operator that is used instead of logical conjunction.

JₑₙₛG

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