std::fpos_t
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  <cstdio>
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|   typedef /* implementation-defined */ fpos_t;  | 
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std::fpos_t is a non-array complete object type, can be used to store (by std::fgetpos) and restore (by std::fsetpos) the position and multibyte parser state (if any) for a C stream.
The multibyte parser state of a wide-oriented C stream is represented by a std::mbstate_t object, whose value is stored as part of the value of a std::fpos_t object by std::fgetpos.
See also
|   gets the file position indicator  (function)  | |
|   moves the file position indicator to a specific location in a file  (function)  | |
|   conversion state information necessary to iterate multibyte character strings  (class)  | |
|   represents absolute position in a stream or a file  (class template)  | |
|   C documentation for fpos_t 
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