CGAL users discussion list

Hello, all

I have compiled and run (OS: WindowsXP IDE: MS VC++ .NET 7.1) the 
Surface_mesh_simplification example provided in CGAL3.3 successfully. But 
when I use the mesh class defined by myself, I got a lot of compiling errors. 
Specifically, I modified the example as follows:

ORIGIN code in 
example/Surface_mesh_simplification/edge_collapse_enriched_polygon.cpp:

typedef CGAL::Polyhedron_3<Kernel, CGAL::Polyhedron_items_with_id_3> Surface;
namespace SMS = CGAL::Surface_mesh_simplification;
typedef SMS::Edge_profile<Surface> Profile;
Surface surface;   // mesh
SMS::Count_ratio_stop_predicate<Surface> stop(0.1);  // stop condition
int r = SMS::edge_collapse   // algorithm
           (surface
           ,stop
           ,CGAL::get_cost     (SMS::Edge_length_cost  <Surface>())
                 .get_placement(SMS::Midpoint_placement<Surface>())
                 .visitor(&vis)
           );

In MY code, I want to let the edge_collapse work with my own mesh class, and 
I change the "typedef" for Surface as follows:

typedef double number_type;
typedef CGAL::Simple_cartesian<number_type> Enriched_kernel;
typedef Enriched_polyhedron<Enriched_kernel, Enriched_items> Surface;

where the Enriched_polyhedron is my own mesh class derived from Polyhedon_3:

template <class kernel, class items>
class Enriched_polyhedron : public CGAL::Polyhedron_3<kernel,items>

When I compiled the modified code, the compiler showed me the a large mount 
of errors, of which the first one is:

$(BOOSTROOT)\boost\graph\graph_traits.hpp(26) : error C2039: 
"vertex_descriptor" : is not a member of "Enriched_polyhedron<kernel,items>"

and I think all the following errors are caused by this error.
Note that all the items for the Enriched_polyhedron have proper id() fields 
as required by edge_collapse.

Is this because there is only an adaptor between Polyhedon_3 and boost's 
graph_traits and no adaptor for other classes even they are derived from 
Polyhedon_3? (my own guess)

If so, does it mean that I can not use my own mesh class without writing the 
adaptor for my Enriched_polyhedron? Is there any other way to simplify a mesh 
instantialized from my own mesh class?

Thank you in advance!