Function enum_bit_or

3rdparty/cppzmq/zmq.hpp:1005–1010

namespace detail
{
template<class T> constexpr T enum_bit_or(T a, T b) noexcept
{
    static_assert(std::is_enum<T>::value, "must be enum");
    using U = typename std::underlying_type<T>::type;
    return static_cast<T>(static_cast<U>(a) | static_cast<U>(b));
}
template<class T> constexpr T enum_bit_and(T a, T b) noexcept
{
    static_assert(std::is_enum<T>::value, "must be enum");