fix crash

repertory/librepertory/include/drives/directory_cache.hpp

@@ -23,6 +23,7 @@
 #define INCLUDE_DRIVES_DIRECTORY_CACHE_HPP_
 
 #include "utils/single_thread_service_base.hpp"
+#include <memory>
 
 namespace repertory {
 class directory_iterator;
@@ -33,7 +34,7 @@ public:
 
 private:
   struct open_directory {
-    directory_iterator *iterator{nullptr};
+    std::shared_ptr<directory_iterator> iterator{};
     std::chrono::system_clock::time_point last_update{
         std::chrono::system_clock::now()};
   };
@@ -59,12 +60,16 @@ public:
   void execute_action(const std::string &api_path,
                       const execute_callback &execute);
 
+  [[nodiscard]] auto get_directory(directory_iterator *iterator)
+      -> std::shared_ptr<directory_iterator>;
+
   [[nodiscard]] auto remove_directory(const std::string &api_path)
-      -> directory_iterator *;
+      -> std::shared_ptr<directory_iterator>;
 
   void remove_directory(directory_iterator *iterator);
 
-  void set_directory(const std::string &api_path, directory_iterator *iterator);
+  void set_directory(const std::string &api_path,
+                     std::shared_ptr<directory_iterator> iterator);
 };
 } // namespace repertory