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