[libcxx-commits] [libcxx] [libcxx] P2278R4: implement `{basic_, }const_iterator`, and have `cbegin` et. al. return it (PR #99915)

[Louis Dionne via libcxx-commits]

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@@ -61,7 +61,7 @@
 "`P1899R3 <https://wg21.link/P1899R3>`__","``stride_view``","2022-07 (Virtual)","","",""
 "`P2093R14 <https://wg21.link/P2093R14>`__","Formatted output","2022-07 (Virtual)","|Complete|","18.0",""
 "`P2165R4 <https://wg21.link/P2165R4>`__","Compatibility between ``tuple``, ``pair`` and ``tuple-like`` objects","2022-07 (Virtual)","","",""
-"`P2278R4 <https://wg21.link/P2278R4>`__","``cbegin`` should always return a constant iterator","2022-07 (Virtual)","","",""
+"`P2278R4 <https://wg21.link/P2278R4>`__","``cbegin`` should always return a constant iterator","2022-07 (Virtual)","|Complete|","20.0","This paper is applied as DR against C++23 (MSVC STL and libstdc++ have done the same). The feature macro is not yet defined, since other features from the original paper have not been completed."
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ldionne wrote:

I am a bit confused: the PR description mentions that the changes to `span` and a few other things are not implemented in this PR, but this is marked as complete. Can we instead implement all the changes in this PR?

Also, since this is a C++23 paper, it seems wrong to say that the paper is being applied as a DR against C++23. It's just a C++23 paper implemented in C++23 (and above). Or did I miss something?

https://github.com/llvm/llvm-project/pull/99915