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[Zohar <>]

I never read the BGL. But I assume that it needs some concepts, and you
provided template instantiation for Polyhedron_3 that supply these concepts.
I have no idea how to methodically connect between BGL requirements and your
patches. Anyway doing some guess work, the following was enough for examples
4.7,4.8:

struct Surface : public CGAL::Polyhedron_3<Kernel,
CGAL::Polyhedron_items_with_id_3> {};

namespace boost {
        template<>
        struct graph_traits<Surface> : public
graph_traits<CGAL::Polyhedron_3&lt;Kernel, CGAL::Polyhedron_items_with_id_3>
> {};

        template<>
        struct graph_traits<Surface const> : public
graph_traits<CGAL::Polyhedron_3&lt;Kernel, CGAL::Polyhedron_items_with_id_3>
const> {};

        template<class Tag>
        struct property_map<Surface, Tag> : public
property_map<CGAL::Polyhedron_3&lt;Kernel,
CGAL::Polyhedron_items_with_id_3>, Tag> {};
} 

namespace CGAL {
        template<>
        struct halfedge_graph_traits<Surface> : public
halfedge_graph_traits<CGAL::Polyhedron_3&lt;Kernel,
CGAL::Polyhedron_items_with_id_3> > {};
}




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