The class
error_code describes an object used to hold error code
values, such as those originating from the operating system or other low-level
application program interfaces
.[
Note 1:
Class
error_code is an
adjunct to error reporting by exception
. —
end note]
namespace std {
class error_code {
public:
error_code() noexcept;
error_code(int val, const error_category& cat) noexcept;
template<class ErrorCodeEnum>
error_code(ErrorCodeEnum e) noexcept;
void assign(int val, const error_category& cat) noexcept;
template<class ErrorCodeEnum>
error_code& operator=(ErrorCodeEnum e) noexcept;
void clear() noexcept;
int value() const noexcept;
const error_category& category() const noexcept;
error_condition default_error_condition() const noexcept;
string message() const;
explicit operator bool() const noexcept;
private:
int val_;
const error_category* cat_;
};
error_code make_error_code(errc e) noexcept;
template<class charT, class traits>
basic_ostream<charT, traits>&
operator<<(basic_ostream<charT, traits>& os, const error_code& ec);
}