[all-commits] [llvm/llvm-project] cb6bcc: [libc++] Backport P3029R1 Better `mdspan`'s CTAD t...

[A. Jiang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cb6bccc33f46cba5bbdba5f3883acde1a1f4f83e
      https://github.com/llvm/llvm-project/commit/cb6bccc33f46cba5bbdba5f3883acde1a1f4f83e
  Author: A. Jiang <de34 at live.cn>
  Date:   2026-07-13 (Mon, 13 Jul 2026)

  Changed paths:
    M libcxx/docs/Status/Cxx26Papers.csv
    M libcxx/include/__mdspan/extents.h
    M libcxx/include/__mdspan/mdspan.h
    M libcxx/include/mdspan
    M libcxx/include/span
    M libcxx/test/std/containers/views/mdspan/extents/ctad.pass.cpp
    M libcxx/test/std/containers/views/mdspan/mdspan/deduction.pass.cpp
    M libcxx/test/std/containers/views/views.span/span.cons/deduct.pass.cpp

  Log Message:
  -----------
  [libc++] Backport P3029R1 Better `mdspan`'s CTAD to C++20/23 (#208132)

Also backport
- support for `T::value` of a reference type in `integral-constant-like`
from P2781R9 `std::constant_wrapper`, and
- LWG4351 _`integral-constant-like`_ needs more `remove_cvref_t`.

P3029R1 (and its further fixes) should be treated as a Defect Report
against C++20/23 to avoid behavior difference in different modes. Other
implementations will do or are already doing the same.



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