Hi,

https://isocpp.org/files/papers/D4039R0.html

In the recent discussion of D4040R0, it was brought up that C2y now
provides the guarantee that hexadecimal digit characters are contiguous.
This was done by
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3192%2epdf

I've drafted up a proposal that adopts that guarantee into C++. Feedback is
welcome.

I expect we can make this a DR against C++98 and pretend it's always been
guaranteed.



Jan