19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.4 Class error_­condition [syserr.errcondition]

19.5.4.5 Non-member functions [syserr.errcondition.nonmembers]

error_condition make_error_condition(errc e) noexcept;
Returns: error_­condition(static_­cast<int>(e), generic_­category()).