Hana Dusíková has an excellent proposal out there called "constexpr
containers and adaptors".

https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p3372r2.html


On Sat, Jan 18, 2025 at 7:59 PM Matthew Satti via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> Hi all,
>
> Given the introduction of constexpr for dynamic containers such as
> std::basic_string and std::vector in C++ 20, have any proposals been
> started to constexpr-ify the remaining containers in the STL?
>
> This would include:
> std::deque
> std::forward_list
> std::list
> std::set
> std::map
> std::multiset
> std::multimap
> std::unordered_set
> std::unordered_map
> std::unordered_multiset
> std::unordered_multimap
> std::stack
> std::queue
> std::priority_queue
> std::flat_set
> std::flat_map
> std::flat_multiset
> std::flat_multimap
>
> Cheers,
> Matt
>
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>