On Sat, Dec 23, 2023 at 10:30 AM Wim Leflere via Std-Proposals <std-proposals@lists.isocpp.org> wrote:
Would there be interest in having more idiomatic versions of the character check functions (from cctype & cwctype)?

It sounds like you're basically proposing that there should be one-argument, as well as two-argument, overloads of
where the one-argument overload `std::islower(t)` would mean no more or less than `std::islower(t, std::locale())`.

"bool std::is_lower(char ch)" and "bool std::is_lower(wchar_t ch)"

FYI, you can't land-grab the name `is_lower`; many real-world codebases define `is_lower` for themselves (even as a macro) precisely because that name is well-known not to be reserved to the implementation. You could, physically, land-grab `isclower` or `islowerchar` or something. But really, I don't see why you'd want to avoid the existing name `islower`.

I don't think such a proposal is really worth it. Locales are awful; nobody likes them. You might have more luck standardizing an "is-lower-case-ASCII" function — which I suspect has even been proposed before, so you should also search for that prior proposal and see how and by whom it was shot down. (I would naturally suspect IBM, with the EBCDIC, in the LEWG.)