So your problem is that C++ prefers free functions instead of these pseudo-members? Because other than the free function vs member access thing, I don't see wh

So your problem is that C++ prefers free functions instead of these pseudo-members? Because other than the free function vs member access thing, I don't see why it would concern the user of `enum_to_string()` that it's a proper function instead of a keyword like `static_assert`...