On Sun, Apr 13, 2025 at 9:38 PM Magnus Fromreide via Std-Proposals <
std-proposals_at_[hidden]> wrote:

>
> template <typename T, typename ... A>
> using is_same_as_one_of_v = (std::is_same<T, A> || ...);
>
> would be a useful addition to the standard library?
>

afaik mp11 was proposed and rejected.
But you can still use it, as it is in Boost.
https://godbolt.org/z/z41nq47s3