std::ftell (3) - Linux Manuals
Defined in header <cstdio>
long ftell( std::FILE* stream );
Returns the current value of the file position indicator for the file stream stream.
If the stream is open in binary mode, the value obtained by this function is the number of bytes from the beginning of the file.
If the stream is open in text mode, the value returned by this function is unspecified and is only meaningful as the input to std::fseek
stream - file stream to examine
File position indicator on success or -1L if failure occurs. Also sets errno on failure.
This section is incomplete
Reason: no example
tellg (public member function of std::basic_istream<CharT,Traits>)
tellp (public member function of std::basic_ostream<CharT,Traits>)