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Alter the size of the file.
void resize(
    uint64_t n,
    boost::system::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.