std::ios_base::~ios_base
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | virtual ~ios_base(); | ||
Destroys the ios_base object. 
Before any of the member functions would yield undefined results, calls callbacks, registered by register_callback() passing erase_event as parameter.
No operations on rdbuf are performed, it is not destroyed.


