Add an example comparing cmap and gmap (allows to test the compatibility of the two packages)

Generalized_map/examples/Generalized_map/comparison_gmap_cmap.cpp

@@ -0,0 +1,55 @@
+#include <CGAL/Generalized_map.h>
+#include <CGAL/Combinatorial_map.h>
+#include <iostream>
+#include <cstdlib>
+
+typedef CGAL::Generalized_map<3>   GMap_3;
+typedef CGAL::Combinatorial_map<3> CMap_3;
+typedef GMap_3::Dart_handle        Dart_const_handle;
+
+template<typename Map>
+void test(Map& m)
+{
+  // Create two tetrahedra.
+  typename Map::Dart_const_handle d1 = m.make_combinatorial_tetrahedron();
+  typename Map::Dart_const_handle d2 = m.make_combinatorial_tetrahedron();
+
+  // Display the map characteristics.
+  m.display_characteristics(std::cout);
+  std::cout<<", valid="<<m.is_valid()<<std::endl;
+
+  unsigned int res = 0;
+  // Iterate through all the darts of the first tetrahedron.
+  for (typename Map::template Dart_of_cell_range<3>::const_iterator
+         it(m.template darts_of_cell<3>(d1).begin()),
+         itend(m.template darts_of_cell<3>(d1).end());
+       it!=itend; ++it)
+    ++res;
+
+  std::cout<<"Number of darts of the first tetrahedron: "<<res<<std::endl;
+
+  res = 0;
+  // Iterate through all the darts of the face incident to d1.
+  for (typename Map::template Dart_of_cell_range<2>::const_iterator
+         it(m.template darts_of_cell<2>(d1).begin()),
+         itend(m.template darts_of_cell<2>(d1).end());
+       it!=itend; ++it)
+    ++res;
+
+  std::cout<<"Number of darts of the face incident to d1: "<<res<<std::endl;
+}
+
+
+int main()
+{
+  CMap_3 cm;
+  GMap_3 gm;
+
+  std::cout<<"Combinatorial map:"<<std::endl;
+  test(cm);
+  
+  std::cout<<"Generalized map:"<<std::endl;
+  test(gm);
+  
+  return EXIT_SUCCESS;
+}