std::basic_iostream<CharT,Traits>::~basic_iostream
From cppreference.com
                    
                                        
                    < cpp | io | basic iostream
                    
                                                            
                    | virtual ~basic_iostream(); | ||
Destructs the input/output stream.
[edit] Notes
This destructor does not perform any operation on the underlying stream buffer (rdbuf()): the destructors of the derived streams such as std::basic_fstream and std::basic_stringstream are responsible for calling the destructors of the stream buffers.


