std::error_category::name
From cppreference.com
                    
                                        
                    < cpp | error | error category
                    
                                                            
                    | virtual const char* name() const = 0; | (since C++11) | |
Returns a pointer to a null-terminated byte string that specifies the name of the error category.
[edit] Parameters
(none)
[edit] Return value
Null-terminated byte string specifying the name of the error category.
[edit] Exceptions
noexcept specification:  
noexcept