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Inherited from basic_file.
Alter the size of the file.
void resize( uint64_t n, asio::error_code & ec);
            This function resizes the file to the specified size, in bytes. If the
            current file size exceeds n
            then any extra data is discarded. If the current size is less than n then the file is extended and filled
            with zeroes.
          
The new size for the file.
Set to indicate what error occurred, if any.