public void dual(Regular_triangulation_2_Vertex_handle c, Power_diagram_2_Face_handle ret) {
   CGAL_Voronoi_diagram_2JNI.Power_diagram_2_dual__SWIG_7(
       swigCPtr,
       this,
       Regular_triangulation_2_Vertex_handle.getCPtr(c),
       c,
       Power_diagram_2_Face_handle.getCPtr(ret),
       ret);
 }
 public Power_diagram_2_Face_handle dual(Regular_triangulation_2_Vertex_handle c) {
   return new Power_diagram_2_Face_handle(
       CGAL_Voronoi_diagram_2JNI.Power_diagram_2_dual__SWIG_6(
           swigCPtr, this, Regular_triangulation_2_Vertex_handle.getCPtr(c), c),
       true);
 }