On Fri, 27 Feb 2026 at 11:17, Jan Schultke via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> Hi,
>
> https://isocpp.org/files/papers/D4040R0.html
>
> I am proposing to add case ranges to C++. For example, this lets you write:
>
> switch (next_char) {
> case '0' ... '9': // ...
> }
>
> Find all the details at the link. Happy to hear any thoughts on the matter.
>

"Empty case ranges such as case -1 ... 0 are valid, but recommended to be
diagnosed. "

Why is that an empty range?