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Implement P2255R2 Type Traits To Detect References Binding To Temporaries for Clang #5537

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Implement P2255R2 Type Traits To Detect References Binding To Temporaries for Clang #5537

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@frederick-vs-ja frederick-vs-ja commented May 24, 2025 •
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Towards #2534.

Notes:

  • Currently this is only enabled for Clang, because MSVC and EDG haven't implemented the necessary intrinsics.
  • There's workaround for LLVM-114344.
  • LWG-3819 has not been implemented. Because Clang's intrinsics haven't covered these cases, and library workaround doesn't seem possible.
  • Test coverage for allocator_arg_t constructors of tuple is missing. It seems to me uses-allocator construction is meaningless for tuple containing references. I've tried to submit an LWG issue to make the allocator_arg_t constructors of tuple<Ts...> deleted when (is_reference_v<Ts> || ...) is true. Edit: LWG-4267.

@frederick-vs-ja frederick-vs-ja requested a review from a team as a code owner May 24, 2025 07:20
@github-project-automation github-project-automation bot moved this to Initial Review in STL Code Reviews May 24, 2025
@StephanTLavavej StephanTLavavej self-assigned this May 27, 2025
@StephanTLavavej StephanTLavavej added the cxx23 C++23 feature label May 27, 2025
@StephanTLavavej StephanTLavavej added the compiler Compiler work involved label Jun 24, 2025
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