19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.2 Class error_code [syserr.errcode]

19.5.2.4 Class error_code observers [syserr.errcode.observers]

int value() const noexcept;

1

Returns: val_.

const error_category& category() const noexcept;

2

Returns: *cat_.

error_condition default_error_condition() const noexcept;

3

Returns: category().default_error_condition(value()).

string message() const;

4

Returns: category().message(value()).

explicit operator bool() const noexcept;

5

Returns: value() != 0.