diff --git a/EGkHashGrids1d.h b/EGkHashGrids1d.h
index cbdfb49..991517c 100644
--- a/EGkHashGrids1d.h
+++ b/EGkHashGrids1d.h
@@ -56,11 +56,11 @@ private :
    typedef std::list<ObjData> ObjList ; 
    typedef std::vector<ObjData*> PtrObjVector ;
    typedef std::unordered_map<int,ObjData*> IntPObjUmap ;
+   typedef std::list<HashGrid1d*> GridList ;
 
 private :
-   typedef std::list<HashGrid1d*> GridList ;  // Tipo per lista di hash grid
-
-private :
+   HashGrids1d( const HashGrids1d&) = delete ;
+   HashGrids1d& operator=( const HashGrids1d&) = delete ;
    void addGrid( ObjData& obj) ;
    void addList( ObjData& obj) ;
 
diff --git a/EGkHashGrids2d.h b/EGkHashGrids2d.h
index 2f18b3e..7de1f1a 100644
--- a/EGkHashGrids2d.h
+++ b/EGkHashGrids2d.h
@@ -56,11 +56,11 @@ class HashGrids2d
       typedef std::list<ObjData> ObjList ; 
       typedef std::vector<ObjData*> PtrObjVector ;
       typedef std::unordered_map<int,ObjData*> IntPObjUmap ;
+      typedef std::list<HashGrid2d*> GridList ;
 
    private :
-      typedef std::list<HashGrid2d*> GridList ;  // Tipo per lista di hash grid
-
-   private :
+      HashGrids2d( const HashGrids2d&) = delete ;
+      HashGrids2d& operator=( const HashGrids2d&) = delete ;
       void addGrid( ObjData& obj) ;
       void addList( ObjData& obj) ;
 
diff --git a/EGkHashGrids3d.h b/EGkHashGrids3d.h
index 6195abd..8795ae1 100644
--- a/EGkHashGrids3d.h
+++ b/EGkHashGrids3d.h
@@ -56,11 +56,11 @@ class HashGrids3d
       typedef std::list<ObjData> ObjList ; 
       typedef std::vector<ObjData*> PtrObjVector ;
       typedef std::unordered_map<int,ObjData*> IntPObjUmap ;
+      typedef std::list<HashGrid3d*> GridList ;
 
    private :
-      typedef std::list<HashGrid3d*> GridList ;  // Tipo per lista di hash grid
-
-   private :
+      HashGrids3d( const HashGrids3d&) = delete ;
+      HashGrids3d& operator=( const HashGrids3d&) = delete ;
       void addGrid( ObjData& obj) ;
       void addList( ObjData& obj) ;