[PATCH] D98477: [ADT] Add IntrusiveVariant, VariantTraits, and new STLForwardCompat

[Scott Linder via Phabricator via llvm-commits]

scott.linder added a comment.

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I did try to write an `offsetof`-based version using inheritance instead of the "common initial sequence" rule, but I am not sure how to do the necessary checks statically. The best I can see to do would be to have some dynamic `ASSERT`s to confirm that casting the alternative type to the base type does not change the underlying representation (i.e. if both pointers are cast to `uintptr_t` they are equal).


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https://reviews.llvm.org/D98477