Added using statements

Nef_3/include/CGAL/Nef_3/SNC_constructor.h

@@ -196,6 +196,8 @@ public:
                                  SHalfedge_around_sface_circulator;
   typedef typename SM_const_decorator::SHalfedge_around_svertex_const_circulator 
                                        SHalfedge_around_svertex_const_circulator; 
+
+  using SNC_decorator::is_standard;
   
   enum{NORMAL, CORNER, DEGENERATE};
 

Nef_3/include/CGAL/Nef_polyhedron_3.h

@@ -330,6 +330,10 @@ protected:
                                                    SFace_cycle_const_iterator;
 
   typedef typename SNC_decorator::Association  Association;
+
+
+ using Decorator::is_standard;
+ using Decorator::is_bounded;
  
  protected: 
   void initialize_infibox_vertices(Content space) {