message: Remove forward declaration im a friend
diff: @@ -154,7 +154,7 @@ namespace RINGMesh {
  */
  class RINGMESH_API RelationshipManager {
  friend class GeoModelBuilderGeology;
  - friend class GeoModelBuilderTopology< 3 >;
  + friend GeoModelBuilderTopology< 3 >;
  public:
  using GeologicalEntityToChild = std::map< GeologicalEntityType, MeshEntityType >;
  using MeshEntityToParents = std::map< MeshEntityType, std::set< GeologicalEntityType > >;
  