message: edit private => protected
diff: @@ -122,7 +122,7 @@ namespace RINGMesh {
  template< index_t DIMENSION >
  class GeogramPointSetMeshBuilder: public PointSetMeshBuilder< DIMENSION > {
  COMMON_GEOGRAM_MESH_BUILDER_IMPLEMENTATION( GeogramPointSetMesh );ringmesh_template_assert_2d_or_3d( DIMENSION );
  - private:
  + protected:
  void set_mesh( PointSetMesh< DIMENSION >& mesh ) override
  {
  set_geogram_mesh(
  @@ -174,7 +174,7 @@ namespace RINGMesh {
  mesh_->mesh_->edges.permute_elements( geo_vector_permutation );
  }
  - private:
  + protected:
  void set_mesh( LineMesh< DIMENSION >& mesh ) override
  {
  set_geogram_mesh(
  @@ -276,7 +276,7 @@ namespace RINGMesh {
  mesh_->mesh_->facets.delete_elements( polygons_to_delete, false );
  }
  - private:
  + protected:
  void set_mesh( SurfaceMeshBase< DIMENSION >& mesh ) override
  {
  set_geogram_mesh(
  @@ -351,7 +351,7 @@ namespace RINGMesh {
  mesh_->mesh_->cells.delete_elements( geo_to_delete, false );
  }
  - private:
  + protected:
  void set_mesh( VolumeMesh< DIMENSION >& mesh ) override
  {
  set_geogram_mesh(
  