> On Mar 12, 2025, at 2:23 AM, Dmitrii Shabalin via Std-Proposals <std-proposals_at_[hidden]> wrote:
>
> If you have any idea how to have a function inside in the enum, please, share your idea with an example.

My first thought was that instead of allowing enums to have member functions I would put an enum inside a class:

class Test
{
public:
    // not en enum class on purpose!
    enum TestEnum { test_value = 0 };

    static string_view to_string(TestEnum);
}

Declaring a variable is slightly more to type:
Test::TestEnum e = test_value;
and you can‘t call it as a member function:
e.to_string(); // not possible

However, the “member function call” could be solved differently. We could, once more, try to allow for member call syntax to also look for “free standing” (or otherwise scoped functions) that take the type as the first parameter. (With this solution it doesn’t really matter if we put the enum inside a namespace or class.)