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[syserr.errcode.overview]
19 Diagnostics library [diagnostics]
19.5 System error support [syserr]
19.5.4 Class error_code [syserr.errcode]
19.5.4.1 Overview [syserr.errcode.overview]
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.
â end note]
namespace std {class error_code {public:// [syserr.errcode.constructors], constructors error_code() noexcept; error_code(int val, const error_category& cat) noexcept; template error_code(ErrorCodeEnum e) noexcept; // [syserr.errcode.modifiers], modifiersvoid assign(int val, const error_category& cat) noexcept; template error_code& operator=(ErrorCodeEnum e) noexcept; void clear() noexcept; // [syserr.errcode.observers], observersint 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_; // exposition onlyconst error_category* cat_; // exposition only}; // [syserr.errcode.nonmembers], non-member functions 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);}