error_condition() noexcept;
error_condition(int val, const error_category& cat) noexcept;
template<class ErrorConditionEnum>
error_condition(ErrorConditionEnum e) noexcept;
void assign(int val, const error_category& cat) noexcept;
template<class ErrorConditionEnum>
error_condition& operator=(ErrorConditionEnum e) noexcept;
void clear() noexcept;
int value() const noexcept;
const error_category& category() const noexcept;
string message() const;
explicit operator bool() const noexcept;