Method flush

src/util/file.cc:134–136

}

bool File::flush() {
  return (is_gz_ ? gzflush(gz_f_, Z_FINISH) == Z_OK : fflush(f_) == 0);
}

bool File::close() {
  bool ret = is_gz_ ? gzclose(gz_f_) == Z_OK : fclose(f_) == 0;