I'm on my phone and Godbolt is awful here so I can't test, but the problem
is likely that your class is POD.
As with everything in c++, terms and conditions may apply.
So if you make members private it will probably fix it, if I'm not mistaken.
Might want to checkout


https://stackoverflow.com/questions/25226347/gcc-clang-lay-out-fields-of-a-derived-struct-in-the-back-padding-of-base-struct/51334730#51334730


Em dom., 3 de dez. de 2023 19:57, Sebastian Wittmeier via Std-Proposals <
std-proposals_at_[hidden]> escreveu:

> Hi Breno,
>
> I can see the padding of base classes being used (without attribute) only
> for empty base classes.
>
> See
>
> https://godbolt.org/z/bnnohMGTv
>
>
>
> What am I missing?
>
> Best,
>
> Sebastian
>
>
> -----Ursprüngliche Nachricht-----
> *Von:* Breno Guimarães via Std-Proposals <std-proposals_at_[hidden]>
> *Gesendet:* So 03.12.2023 23:17
> *Betreff:* Re: [std-proposals] std::sizeof_minus_trailing_padding
> *An:* Std-Proposals <std-proposals_at_[hidden]>;
> *CC:* Breno Guimarães <brenorg_at_[hidden]>;
> Yeah, the link only talks about empty base class optimization, but that
> happens with non empty too. It should've been called "padding optimization"
> or something.
>
> Just derive a class with trailing padding and add a member that can fit in
> the padding and the padding will be reused.
>
> Em dom., 3 de dez. de 2023 18:48, Frederick Virchanza Gotham via
> Std-Proposals <std-proposals_at_[hidden]> escreveu:
>
> On Sun, Dec 3, 2023 at 7:20 PM Breno Guimarãeswrote:
> >
> > By the way, the no_unique_address annotation didn't bring the concept of
> overlapping objects. It already existed.
> >
> > https://en.cppreference.com/w/cpp/language/ebo
>
>
> But people haven't been memcpy'ing and memset'ing empty base classes
> for a few decades.
>
> Bringing it in for types where people would have historically been
> using 'memset' as a bulldozer for a few decades is a much bigger deal.
> --
> Std-Proposals mailing list
> Std-Proposals_at_[hidden]
> https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals
>
>
> --
> Std-Proposals mailing list
> Std-Proposals_at_[hidden]
> https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals
>
> --
> Std-Proposals mailing list
> Std-Proposals_at_[hidden]
> https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals
>