[all-commits] [llvm/llvm-project] 6d9dfd: [libc++][type_traits] Implements "A type trait to ...

[Hristo Hristov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6d9dfd75e4df9fdff9ea34f1c0bd741bf5b53b89
      https://github.com/llvm/llvm-project/commit/6d9dfd75e4df9fdff9ea34f1c0bd741bf5b53b89
  Author: Hristo Hristov <hghristov.rmm at gmail.com>
  Date:   2025-03-08 (Sat, 08 Mar 2025)

  Changed paths:
    M libcxx/docs/ReleaseNotes/21.rst
    M libcxx/docs/Status/Cxx23Papers.csv
    M libcxx/include/CMakeLists.txt
    A libcxx/include/__type_traits/reference_constructs_from_temporary.h
    A libcxx/include/__type_traits/reference_converts_from_temporary.h
    M libcxx/include/module.modulemap
    M libcxx/include/type_traits
    M libcxx/modules/std/type_traits.inc
    M libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/common.h
    M libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_implicit_lifetime.pass.cpp
    M libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_implicit_lifetime.verify.cpp
    A libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/reference_constructs_from_temporary.pass.cpp
    A libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/reference_converts_from_temporary.pass.cpp

  Log Message:
  -----------
  [libc++][type_traits] Implements "A type trait to detect reference binding to temporary" (#128649)

Implements partially: [P2255R2: A type trait to detect reference binding
to temporary](https://wg21.link/P2255R2)
Issue: https://github.com/llvm/llvm-project/issues/105180

https://eel.is/c++draft/meta.type.synop
https://eel.is/c++draft/meta.unary.prop

Implented type traits:
- [x] `reference_constructs_from_temporary`
- [x] `reference_converts_from_temporary`

Closes #129049

Minor drive-by tweak to `std::is_implicit_lifetime` tests.

---------

Co-authored-by: Hristo Hristov <zingam at outlook.com>



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