Internal boundaries emna

include/ringmesh/geomodel/builder/geomodel_builder.h

@@ -125,7 +125,7 @@ namespace RINGMesh
         /*!
          * @brief Finish up geomodel building and complete missing information.
          */
-        void end_geomodel();
+        virtual void end_geomodel() = 0;
 
         void build_corners_from_lines();
 
@@ -164,6 +164,8 @@ namespace RINGMesh
 
         ~GeoModelBuilder();
 
+        void end_geomodel() final;
+
         void build_surfaces_from_corners_and_lines();
 
     private:
@@ -177,6 +179,8 @@ namespace RINGMesh
     public:
         explicit GeoModelBuilder( GeoModel3D& geomodel );
 
+        void end_geomodel() final;
+
         void build_regions_from_lines_and_surfaces();
     };