Gui: Reduce code duplication in ViewProviderCoordinateSystem

src/Gui/ViewProviderCoordinateSystem.h

@@ -24,6 +24,7 @@
 #ifndef GUI_VIEWPROVIDER_ViewProviderOrigin_H
 #define GUI_VIEWPROVIDER_ViewProviderOrigin_H
 
+#include <functional>
 #include <App/PropertyGeo.h>
 
 #include "ViewProviderGeoFeatureGroup.h"
@@ -32,6 +33,7 @@
 namespace Gui {
 
 class Document;
+class ViewProviderDatum;
 
 class GuiExport ViewProviderCoordinateSystem : public ViewProviderGeoFeatureGroup
 {
@@ -84,10 +86,15 @@ public:
 
     // default color for origini: light-blue (50, 150, 250, 255 stored as 0xRRGGBBAA)
     static const uint32_t defaultColor = 0x3296faff;
+
 protected:
     void updateData(const App::Property*) override;
     bool onDelete(const std::vector<std::string> &) override;
 
+private:
+    using DatumObjectFunc = std::function<void(ViewProviderDatum*)>;
+    void applyDatumObjects(const DatumObjectFunc& func);
+
 private:
     SoGroup *pcGroupChildren;