std::back_insert_iterator::operator*
From cppreference.com
                    
                                        
                    < cpp | iterator | back insert iterator
                    
                                                            
                    | back_insert_iterator& operator*(); | ||
Does nothing, this member function is provided to satisfy the requirements of OutputIterator.
It returns the iterator itself, which makes it possible to use code such as *iter = value to output (insert) the value into the underlying container.
[edit] Parameters
(none)
[edit] Return value
*this