D vs C++ classes?

[Mathias LANG]

On Monday, 21 June 2021 at 13:40:42 UTC, Ola Fosheim Grøstad 
wrote:
> What prevents unifying D classes with C++?
>
> By that I mean: shouldn't it be possible to formulate an ABI 
> for D classes that makes them fully C++ compatible?
>
> Seems to me that D-interfaces can be implemented with C++ ABI 
> for multiple inheritance for instance.

The main reason they can't be ABI compatible is the TypeInfo 
AFAIR.
But `extern(C++)` does the job just fine.