Is it possible to use std::byte as the underlying type for an enum class?

Question

Since std::byte is by definition not an integral type, the following fragment is ill-formed:

enum class foo : std::byte
{
    bar = 1,
    baz = 2
};

Is there a way in C++17 to do something equivalent to this?

Edit: I'm not trying to solve any particular problem. Obviously enum class whatever : unsigned char would do it. However, I was expecting std::byte to be a little more flexible and wanted to know whether this is possible at all.

Answer 1

std::byte is defined by the standard to be an enum class. Therefore, it has an underlying type (of unsigned char). So you can create an enum with the same underlying type:

enum class foo : std::underlying_type_t<std::byte>
{...};

Answer 2

You can use unsigned char or uint8_t instead.