system_error Class

Represents the base class for all exceptions thrown to report a low-level system error.

Syntax

class system_error : public runtime_error {
    explicit system_error(error_code _Errcode, const string& _Message = "");
    system_error(error_code _Errcode, const char *_Message);
    system_error(error_code::value_type _Errval, const error_category& _Errcat, const string& _Message);
    system_error(error_code::value_type _Errval, const error_category& _Errcat, const char *_Message);

    const error_code& code() const throw();
    const char* what() const noexcept override;
};

Remarks

The value returned by what in the class exception is constructed from _Message and the stored object of type error_code (either code or error_code(_Errval, _Errcat)).

The member function code returns the stored error_code object.