std::basic_ofstream<CharT,Traits>::swap
From cppreference.com
                    
                                        
                    < cpp | io | basic ofstream
                    
                                                            
                    
|   void swap( basic_ofstream& other );  | 
(since C++11) | |
Exchanges the state of the stream with those of other. 
This is done by calling basic_ostream<CharT, Traits>::swap(other) and rdbuf()->swap(other.rdbuf()).
Parameters
| other | - | stream to exchange the state with | 
Return value
(none)
Example
| This section is incomplete Reason: no example  | 
See also
|    (C++11)  | 
   moves the file stream   (public member function)  | 
|    (C++11)  | 
   swaps two basic_filebuf objects   (public member function of std::basic_filebuf<CharT,Traits>)  |