[libcxx-commits] [libcxx] [libc++] Ensure that `std::expected` has no tail padding (PR #69673)
Richard Smith via libcxx-commits
libcxx-commits at lists.llvm.org
Fri Oct 20 15:35:24 PDT 2023
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In-Reply-To: <llvm/llvm-project/pull/69673/libcxx at github.com>
zygoloid wrote:
> > ... then apply `std::construct_at` to the `repr` member from `emplace`.
>
> Wouldn't `std::construct_at` still be invalid, technically, when called on `__repr_.__union_.__val_`? Isn't that still a partially overlapping subobject?
Yes, that would be invalid. You need to apply `std::construct_at` to the `repr` member itself, not to the value inside the union.
https://github.com/llvm/llvm-project/pull/69673
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