P2821R5 `span::at()`

[StephanTLavavej]

WG21-P2821R5 span::at()

INCREASED feature-test macro; note that WG21-P2833R2 #4177 is intentionally simultaneously updating this value:

#define __cpp_lib_span 202311L

Note: We are not yet accepting PRs for C++26 features.

[heckerpowered]

Hi, I'm implementing P2821R5 in my repository.
But it seems like I shouldn't create the PR until the remaining library-only features in C++ 23 are done.

[StephanTLavavej]

I'll move this to Investigating for you. Correct, we aren't accepting C++26 PRs yet, although we hope to finish the C++23 library-only features soon.

[SuperWig]

You should add tests as you've got the condition backwards. You're currently throwing on valid indices.

[heckerpowered]

You should add tests as you've got the condition backwards. You're currently throwing on valid indices.

Thanks for the reminder, I'll make it correct when I create the pull request.

[MrinmoyHaloi]

Any update on it? Clang and GCC has had it for more than a year now.

[frederick-vs-ja]

I think this can be completed and reviewed in one or two weeks once MSVC STL starts accepting C++26 features.