Does C ++ ABI indicate how vTable and RTTI information should exist?

Question

A popular implementation, such as GCC / VC, uses the first size_t space of a polymorphic object as a pointer, indicating a vtable structure. Is this part the latest C ++ ABI?

What about an RTTI implementation, does C ++ ABI indicate how to implement it? Thanks

Answer 1

No, the C ++ standard does not indicate how this should be implemented. There is no C ++ ABI.