How to use C++11 enum class for flags

Question

Say I have such a class:

enum class Flags : char
{
    FLAG_1 = 1;
    FLAG_2 = 2;
    FLAG_3 = 4;
    FLAG_4 = 8;
};

Now can I have a vari

Answer 1

It's maybe better to make use of std::underlying_type instead of hard-coding char type.

Flags operator|(Flags lhs, Flags rhs) {
    return static_cast(
        static_cast::type>(lhs) |
        static_cast::type>(rhs)
    );
}

Now, you can change the underlying type of your enumeration without needing to update that type in every bitwise operator overload.