std::rewind
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header <cstdio>
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|   void rewind( FILE *stream );  | 
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Moves the file position indicator to the beginning of the given file stream. EOF and error flags are also cleared.
[edit] Parameters
| stream | - | file stream to modify | 
[edit] Return value
(none)
[edit] See also
|    moves the file position indicator to a specific location in a file  (function)  | |
|   C documentation for rewind 
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