+ /// Returns the invalid data pointer (to avoid working with NULL shared ptrs in swig)
+ MODEL_EXPORT virtual std::shared_ptr<ModelAPI_Data> invalidPtr();
+
+ /// Returns the invalid data pointer: static method
+ static std::shared_ptr<ModelAPI_Data> invalidData();
+
+protected:
+ /// Returns true if "is in history" custom behaviors is defined for the feature
+ MODEL_EXPORT virtual bool isInHistory();
+
+ /// Defines the custom "is in history" behavior
+ MODEL_EXPORT virtual void setIsInHistory(const bool theFlag);
+
+private:
+ /// Removes all information about back references
+ void eraseBackReferences();
+ /// Adds a back reference (with identifier which attribute references to this object
+ /// It does not change the consealment flag of the data object result
+ /// \param theFeature feature referenced to this
+ /// \param theAttrID identifier of the attribute that is references from theFeature to this
+ void removeBackReference(FeaturePtr theFeature, std::string theAttrID);
+ /// Adds a back reference (with identifier which attribute references to this object
+ /// \param theFeature feature referenced to this
+ /// \param theAttrID identifier of the attribute that is references from theFeature to this
+ /// \param theApplyConcealment applies consealment flag changes
+ void addBackReference(FeaturePtr theFeature, std::string theAttrID,
+ const bool theApplyConcealment = true);
+
+ /// Returns true if object must be displayed in the viewer: flag is stored in the
+ /// data model, so on undo/redo, open/save or recreation of object by history-playing it keeps
+ /// the original state i nthe current transaction.
+ MODEL_EXPORT virtual bool isDisplayed();
+
+ /// Sets the displayed/hidden state of the object. If it is changed, sends the "redisplay"
+ /// signal.
+ MODEL_EXPORT virtual void setDisplayed(const bool theDisplay);