Add a Rebind_vertex and a Rebind_cell to the TDS that allow to get new TDS types

with changes vertex/cell types.  Documented as advanced in the TDS concept.

Triangulation_3/doc_tex/TriangulationDS_3_ref/TriangulationDataStructure_3.tex

@@ -100,6 +100,21 @@ Requirements for \ccc{Vertex} and \ccc{Cell} are described in
 \ccRefPage{TriangulationDataStructure_3::Vertex} and
 \ccRefPage{TriangulationDataStructure_3::Cell})}.
 
+\begin{ccAdvanced}
+\ccNestedType{template <typename Vb2> struct Rebind_vertex}
+{This nested template class allows to get the type of a triangulation
+data structure that only changes the vertex type.  It has to define a type
+\ccc{Other} which is a {\it rebound} triangulation data structure, that is, the
+one whose \ccc{TriangulationDSVertexBase_3} will be \ccc{Vb2}.}
+\ccGlue
+\ccNestedType{template <typename Cb2> struct Rebind_cell}
+{This nested template class allows to get the type of a triangulation
+data structure that only changes the cell type.  It has to define a type
+\ccc{Other} which is a {\it rebound} triangulation data structure, that is, the
+one whose \ccc{TriangulationDSCellBase_3} will be \ccc{Cb2}.}
+\end{ccAdvanced}
+
+
 \ccTypedef{typedef Triple<Cell_handle, int, int> Edge;}{\ccc{(c,i,j)} is the
 edge of cell \ccc{c} whose vertices indices are \ccc{i} and
 \ccc{j}. (See Section~\ref{TDS3-sec-intro}.)}

Triangulation_3/include/CGAL/Triangulation_data_structure_3.h

@@ -60,6 +60,18 @@ class Triangulation_data_structure_3
 
 public:
 
+  // Tools to change the Vertex and Cell types of the TDS.
+  template < typename Vb2 >
+  struct Rebind_vertex {
+    typedef Triangulation_data_structure_3<Vb2, Cb>  Other;
+  };
+
+  template < typename Cb2 >
+  struct Rebind_cell {
+    typedef Triangulation_data_structure_3<Vb, Cb2>  Other;
+  };
+
+  // Put this TDS inside the Vertex and Cell types.
   typedef typename Vb::template Rebind_TDS<Tds>::Other  Vertex;
   typedef typename Cb::template Rebind_TDS<Tds>::Other  Cell;
 

Triangulation_3/test/Triangulation_3/include/CGAL/_test_cls_tds_3.h

@@ -25,6 +25,9 @@
 #include "_test_cls_tds_vertex.h"
 #include "_test_cls_tds_cell.h"
 
+#include <CGAL/Triangulation_vertex_base_with_info_3.h>
+#include <CGAL/Triangulation_cell_base_with_info_3.h>
+
 template <class Tds>
 void
 _test_cls_tds_3( const Tds &)
@@ -44,6 +47,15 @@ _test_cls_tds_3( const Tds &)
   typedef typename Tds::Cell_handle       Cell_handle;
   typedef typename Tds::Cell_iterator     Cell_iterator;
 
+  // test rebinds :
+  typedef CGAL::Triangulation_cell_base_with_info_3<double, Cell> New_cell_base;
+  // I can't rebind the vertex that easily as the with_info needs a Point... :(
+  // so let's fake a rebind vertex.
+  // typedef CGAL::Triangulation_vertex_base_with_info_3<double, Vertex> New_vertex_base;
+
+  typedef typename Tds::template Rebind_vertex<Vertex>::Other             New_TDS_1;
+  typedef typename New_TDS_1::template Rebind_cell<New_cell_base>::Other  New_TDS;
+
   // test Vertex and cell :
   std::cout << "    Test Vertex " << std::endl;
   _test_vertex_tds_3(Vertex());