How does inheritance and vtables work wrt. C++ and interop with D? Fns w/ Multiple-inheritance args impossible to bind to?

[Ola Fosheim Grostad]

On Sunday, 23 May 2021 at 19:44:01 UTC, Gavin Ray wrote:
> So one of the problems with generating D code for bindings to 
> C++ is that there's no true/direct multiple inheritance.
>
> If anyone happens to understand well how vtables work and the 
> way the compiler treats these things, is there a way to hackily 
> make semantically-equivalent objects?

I believe Clang and MSVC are using different layouts.
If I am not wrong clang/gcc are using the Itanium ABI, but I 
could be wrong.

https://itanium-cxx-abi.github.io/cxx-abi/abi.html#vtable

Maybe ask in the LDC forum as they follow Clang? In my opinion MI 
ought to be supported for binding, but... not sure if anyone has 
considered it.