336   struct CopyOrCreateWorkItem {  struct in ROCKSDB_NAMESPACE::BackupEngineImpl
337     std::string src_path;
338     std::string dst_path;
339     std::string contents;
340     Env* src_env;
341     Env* dst_env;
342     EnvOptions src_env_options;
343     bool sync;
344     RateLimiter* rate_limiter;
345     uint64_t size_limit;
346     std::promise<CopyOrCreateResult> result;
347     std::function<void()> progress_callback;
349     CopyOrCreateWorkItem()  in CopyOrCreateWorkItem()  argument
363     CopyOrCreateWorkItem(CopyOrCreateWorkItem&& o) ROCKSDB_NOEXCEPT {  in CopyOrCreateWorkItem()  argument
367     CopyOrCreateWorkItem& operator=(CopyOrCreateWorkItem&& o) ROCKSDB_NOEXCEPT {  in operator =()
382     CopyOrCreateWorkItem(std::string _src_path, std::string _dst_path,  in CopyOrCreateWorkItem()  function
386                          std::function<void()> _progress_callback = []() {})  in CopyOrCreateWorkItem()