But you said before that D and E were correct and valid, although A and E have the same int and A and D the same float. So you always have to provide the pair of numbers and not a single element can be back-converted into the enum.     enum struct E : int, float { A { 0, 0.5f }, B { 3, 0.42f }, C { …, 0.0f }, D { ..., 0.5f}, E {0, 1.f} };   Or you just want to be able to convert enums into arbitrary types? E.g. an enum into a stringified name? Or a stringified name back to an enum? That only works, if they are unique, which you explicitly said, is not necessary.     -----Ursprüngliche Nachricht----- Von:Filip <fph2137_at_[hidden]> Gesendet:Fr 14.03.2025 15:23 Betreff:Re: [std-proposals] lambdas in enums An:std-proposals_at_[hidden]; CC:Sebastian Wittmeier <wittmeier_at_[hidden]>; std-proposals_at_[hidden]; I would like any types to be listed, however I’m unsure about accessing them then. Using static_cast seems impossible with the same type written couple of times.  Perhaps distinct types should be the only option here and dynamic_cast to access them, since it does evoke the idea of “change between inheritance”.  I would like to avoid adding additional operator or keyword here so I’m open to suggestions. I also don’t like dynamic_cast here but it seems like, an option at least, that would not break anything. Cheers, Filip Wiadomość napisana przez Sebastian Wittmeier via Std-Proposals <std-proposals_at_[hidden]> w dniu 14 mar 2025, o godz. 13:53:  Do you want to allow   enum class E : int, int, int, int, int {   -----Ursprüngliche Nachricht----- Von:Filip <fph2137_at_[hidden]> Gesendet:Fr 14.03.2025 11:21 Betreff:Re: [std-proposals] lambdas in enums An:std-proposals_at_[hidden]; CC:Sebastian Wittmeier <wittmeier_at_[hidden]>; std-proposals_at_[hidden]; C would be { 4, 0.0f } D would be { 5, 0.5f }  We should probably not break the current functionality of storing the same value many times. All of them could be the same or different. -- Std-Proposals mailing list Std-Proposals_at_[hidden] https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals