[all-commits] [llvm/llvm-project] 1c48c9: [libc++] Implement P2985R0: std::is_virtual_base_o...

[Louis Dionne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1c48c9cc43dbbbd1751e15d199b4d7d4fc52d828
      https://github.com/llvm/llvm-project/commit/1c48c9cc43dbbbd1751e15d199b4d7d4fc52d828
  Author: Louis Dionne <ldionne.2 at gmail.com>
  Date:   2024-08-26 (Mon, 26 Aug 2024)

  Changed paths:
    M libcxx/docs/FeatureTestMacroTable.rst
    M libcxx/docs/ReleaseNotes/20.rst
    M libcxx/docs/Status/Cxx2cPapers.csv
    M libcxx/include/__type_traits/is_base_of.h
    M libcxx/include/type_traits
    M libcxx/include/version
    M libcxx/test/std/language.support/support.limits/support.limits.general/type_traits.version.compile.pass.cpp
    M libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
    A libcxx/test/std/utilities/meta/meta.rel/is_virtual_base_of.pass.cpp
    M libcxx/utils/generate_feature_test_macro_components.py

  Log Message:
  -----------
  [libc++] Implement P2985R0: std::is_virtual_base_of (#105847)

This trait is implemented in C++26 conditionally on the compiler
supporting the __builtin_is_virtual_base_of intrinsic. I believe only
tip-of-trunk Clang currently implements that builtin.

Closes #105432



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