On Fri, 27 Feb 2026 at 18:03, Jan Schultke via Std-Proposals <std-proposals@lists.isocpp.org> wrote:

> if (c >= 'a' && c <= 'z')

This relies on ASCII being used, which I think should be mentioned. Somewhat
related, but C2Y is standardizing sequential hex digits so case'a'...'f' and
case'A'...'F' will work regardless of the character set used.

Do you have a link for that?

https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3192.pdf