std::error_condition::message
From cppreference.com
                    
                                        
                    < cpp | error | error condition
                    
                                                            
                    | std::string message() const; | (since C++11) | |
Returns an explanatory message for the stored error code and error category. Effectively calls category().message(value()).
[edit] Parameters
(none)
[edit] Return value
An explanatory message for the stored error code and error category.
[edit] Exceptions
(none)