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P2985R0: A type trait for detecting virtual base classes #105432

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ldionne opened this issue Aug 20, 2024 · 1 comment · Fixed by #105847
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P2985R0: A type trait for detecting virtual base classes #105432

ldionne opened this issue Aug 20, 2024 · 1 comment · Fixed by #105847
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c++26 libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. wg21 paper Issues representing the implementation of a WG21 paper

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ldionne commented Aug 20, 2024

Link: https://wg21.link/P2985R0
@ldionne ldionne added c++26 libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. wg21 paper Issues representing the implementation of a WG21 paper labels Aug 20, 2024
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See also #98310 -- the compiler builtin (necessary to implement the trait) has already been added.

@ldionne ldionne self-assigned this Aug 23, 2024
ldionne added a commit to ldionne/llvm-project that referenced this issue Aug 23, 2024
@ldionne
[libc++] Implement P2985R0: std::is_virtual_base_of
eb33f89 
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 llvm#105432
@ldionne ldionne mentioned this issue Aug 23, 2024
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c++26 libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. wg21 paper Issues representing the implementation of a WG21 paper
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libc++ Standards Conformance
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[libc++] Implement P2985R0: std::is_virtual_base_of ldionne/llvm-project
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