error_code make_error_code(errc e) noexcept;
Returns: error_code(static_cast<int>(e), generic_category()).
template <class charT, class traits>
basic_ostream<charT, traits>&
operator<<(basic_ostream<charT, traits>& os, const error_code& ec);
Effects: As if by: os << ec.category().name() << ':' << ec.value();