samedi 1 octobre 2016

Ensure template parameter is an enum class

Is there a way to ensure a template parameter is an enum-class type?

I know type_traits has std::is_enum, but I don't want it to match regular enums, just enum_classes.

Example of the wanted effect:

enum class EnumClass {};
enum Enum {};
class Class {};

template <typename T>
void Example()
{
    static_assert(/* T is EnumClass */, "`T` must be an enum class");
}

Example<EnumClass>(); // Ok
Example<Enum>(); // Error
Example<Class>(); // Error

I am using C++11, and unfortunately cannot go any higher (though I'd be curious to know the solution anyway, even if it involves newer standards).

Is it possible?

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