[all-commits] [llvm/llvm-project] a0c00c: [libc++] P2944R3: Constrained comparisons - update...

[Hristo Hristov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a0c00ccd5ff180c721def8001c870338d5de319e
      https://github.com/llvm/llvm-project/commit/a0c00ccd5ff180c721def8001c870338d5de319e
  Author: Hristo Hristov <hghristov.rmm at gmail.com>
  Date:   2025-06-15 (Sun, 15 Jun 2025)

  Changed paths:
    M libcxx/docs/Status/Cxx2cPapers.csv
    M libcxx/include/__functional/reference_wrapper.h
    M libcxx/test/std/containers/sequences/array/compare.three_way.pass.cpp
    M libcxx/test/std/utilities/function.objects/refwrap/refwrap.comparissons/compare.three_way.refwrap.const_ref.pass.cpp
    M libcxx/test/std/utilities/function.objects/refwrap/refwrap.comparissons/compare.three_way.refwrap.refwrap.pass.cpp
    M libcxx/test/std/utilities/function.objects/refwrap/refwrap.comparissons/compare.three_way.refwrap.refwrap_const.pass.cpp
    M libcxx/test/std/utilities/function.objects/refwrap/refwrap.comparissons/equal.refwrap.const_ref.pass.cpp
    M libcxx/test/std/utilities/function.objects/refwrap/refwrap.comparissons/equal.refwrap.refwrap.pass.cpp
    M libcxx/test/std/utilities/function.objects/refwrap/refwrap.comparissons/equal.refwrap.refwrap_const.pass.cpp
    R libcxx/test/std/utilities/function.objects/refwrap/refwrap.comparissons/helper_concepts.h
    R libcxx/test/std/utilities/function.objects/refwrap/refwrap.comparissons/helper_types.h
    M libcxx/test/support/test_comparisons.h
    M libcxx/test/support/test_container_comparisons.h

  Log Message:
  -----------
  [libc++] P2944R3: Constrained comparisons - update `reference_wrapper` implementation (#139368)

Updates the implementation `std::reference_wrapper` -
[P2944R3](https://wg21.link/P2944R3) as discussed in
https://github.com/llvm/llvm-project/pull/117664#discussion_r1857826166
This PR also refactors the tests in preparation to implements the
constrained comparisons for `optional`, `variant` etc.

- Moves the test helpers (concepts and types) for testing constrained
comparisons to `test_comparisons.h`.
- Updates the `std::reference_wrapper` implementation to use the concept
`__core_convertible_to<bool>` as per comments in #135759.

Closes #138233

# References:
- [refwrap.comparisons](https://wg21.link/refwrap.comparisons)

---------

Co-authored-by: Hristo Hristov <zingam at outlook.com>
Co-authored-by: Nikolas Klauser <nikolasklauser at berlin.de>



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