Another missing bit...

include/hdb++/AbstractDB.h

@@ -96,5 +96,16 @@ public:
     virtual bool supported(HdbppFeatures feature) = 0;
 };
 
+// Abstract factory class that backend must implement to help create an instance
+// of the storage class deriving from AbstractDB
+class DBFactory
+{
+public:
+    // Create a backend database object, and return it as a pointer
+    virtual AbstractDB *create_db(const string &id, const std::vector<std::string> &configuration) = 0;
+    virtual ~DBFactory() {};
+};
+
 } // namespace hdbpp
+
 #endif // _HDBPP_ABSTRACTDB_H