Function operator|

3rdparty/cppzmq/zmq.hpp:1039–1042

};

constexpr send_flags operator|(send_flags a, send_flags b) noexcept
{
    return detail::enum_bit_or(a, b);
}
constexpr send_flags operator&(send_flags a, send_flags b) noexcept
{
    return detail::enum_bit_and(a, b);