observationInterface is pure virtual again

Signed-off-by: hpcwoess <woessner@hlrs.de>

OpenPass_Source_Code/openPASS/CoreModules/Observation_State/observation_state_implementation.h

@@ -133,6 +133,10 @@ public:
     {
         return "";   //dummy
     }
+    virtual void Insert(int time, int agentId, LoggingGroup group, const std::string& key, const std::string& value) {};
+    virtual void InsertEvent(std::shared_ptr<EventInterface> event) {};
+    virtual void GatherFollowers() {};
+    virtual void InformObserverOnSpawn(AgentInterface* agent) {};
 
 private:
     void RecordAllAgents(int time);

OpenPass_Source_Code/openPASS/Interfaces/observationInterface.h

@@ -117,18 +117,18 @@ public:
     //! \param key        topic
     //! \param value      value
     //-----------------------------------------------------------------------------
-    virtual void Insert(int time, int agentId, LoggingGroup group, const std::string& key, const std::string& value) {};
+    virtual void Insert(int time, int agentId, LoggingGroup group, const std::string& key, const std::string& value) = 0;
 
     //-----------------------------------------------------------------------------
     /*!
     * \brief Insert the event into the EventNetwork
     */
     //-----------------------------------------------------------------------------
-    virtual void InsertEvent(std::shared_ptr<EventInterface> event) {};
+    virtual void InsertEvent(std::shared_ptr<EventInterface> event) = 0;
 
-    virtual void GatherFollowers() {};
+    virtual void GatherFollowers() = 0;
 
-    virtual void InformObserverOnSpawn(AgentInterface* agent) {};
+    virtual void InformObserverOnSpawn(AgentInterface* agent) = 0;
 
 protected:
     //-----------------------------------------------------------------------------