A Slice enumeration maps to the corresponding enum class in C++.
For example:
Slice
enum Fruit { Apple, Pear, Orange }
The generated C++ enumeration is:
C++
enum class Fruit : unsigned char { Apple, Pear, Orange };
The underlying type is unsigned char when the enumeration's largest enumerator value is not greater than 254, otherwise it's the default, int.
You can alternatively generate an old-style unscoped enum with the cpp:unscoped metadata directive.
Suppose we modify the Slice definition to include a custom enumerator value:
Slice
enum Fruit { Apple, Pear = 3, Orange }
The generated C++ definition now includes an explicit initializer for every enumerator:
C++
enum class Fruit : unsigned char { Apple = 0, Pear = 3, Orange = 4 };