Hi, would using a std::variant help your usecase?
You would be defining a struct for every enum, and concatenation of types
is not trivial, but it may work.
https://godbolt.org/z/6cqqeE6WM

On Wed, Sep 1, 2021 at 8:09 PM Murat Hepeyiler via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> I have faced up a problem that I need to extend the enum class for each
> system.
>