Function operator&

3rdparty/cppzmq/zmq.hpp:1043–1046

    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);
}
constexpr send_flags operator^(send_flags a, send_flags b) noexcept
{
    return detail::enum_bit_xor(a, b);