19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.5 Class error_­condition [syserr.errcondition]

19.5.5.1 Overview [syserr.errcondition.overview]

The class error_­condition describes an object used to hold values identifying error conditions.
[Note 1:
error_­condition values are portable abstractions, while error_­code values ([syserr.errcode]) are implementation specific.
— end note]
namespace std { class error_condition { public: // [syserr.errcondition.constructors], constructors error_condition() noexcept; error_condition(int val, const error_category& cat) noexcept; template<class ErrorConditionEnum> error_condition(ErrorConditionEnum e) noexcept; // [syserr.errcondition.modifiers], modifiers void assign(int val, const error_category& cat) noexcept; template<class ErrorConditionEnum> error_condition& operator=(ErrorConditionEnum e) noexcept; void clear() noexcept; // [syserr.errcondition.observers], observers int value() const noexcept; const error_category& category() const noexcept; string message() const; explicit operator bool() const noexcept; private: int val_; // exposition only const error_category* cat_; // exposition only }; }