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Hello,

Beware : I might be a silly question !

To be able to add some functionalities (like void draw()  or void setName) to
Polygon_2 class, I'm looking for the way to inherit from the class.

To aim that I did the following declaration for my new class :

...

#include <CGAL/Polygon_2.h>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>

typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_2 Point;
typedef CGAL::Polygon_2<K> Polygon_2;

class AC_Polygon : public CGAL::Polygon_2<Polygon_2>
{
public:
       AC_Polygon();
    ~AC_Polygon();

    void draw() const;
};

...

It compiles well, but when I instantiate my new class AC_Polygon,
I do not have the methods like :

is_simple()

is_convex()

the compiler says :

/usr/include/CGAL/Polygon_2/Polygon_2_simplicity.h:135: erreur: no type named
«Orientation_2» in «class
CGAL::Polygon_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double> >,
std::vector<CGAL::Point_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>
> >,
std::allocator<CGAL::Point_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>
> > > > >»


Any ideas

Gilles