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Hello,

I found an example of inherited class.
It's in a  pdf-file about 2d Triangulations,
from Pierre Alliez and Mariette Yvinec :

Page 55 :

Drawing Generators...

template <class kernel, class TDS>
class DT2 : public CGAL::Delaunay_triangulation_2<kernel,TDS>
{
    public:
    void gl_draw_generators()
    {
          ::glBegin(GL_POINTS);
          Point_iterator it;
          for(it = points_begin();
               it != points_end();
               it++)
          {
                      const Point& p = *it;
                      ::glVertex2f(p.x(),p.y());
          }
          ::glEnd();
    }

I tried to use the derivated class (DT2) this way :

int main(int argc, char *argv[])
{
    typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
    typedef CGAL::Triangulation_euclidean_traits_xy_3<K> Gt;
    typedef CGAL::Delaunay_triangulation_2<Gt> Delaunay;

    Delaunay* normal=new Delaunay;       // Cela fonctionne ( pas d'héritage )

    DT2<K,Gt>* heritage=new DT2<K,Gt>();   // Cela provoque une quantité
d'erreur 'no type named...'
}

The first error is :

/usr/include/CGAL/Triangulation_2.h:77: erreur: no type named ‘size_type’
in ‘class CGAL::Etxy3<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double> >
>’

...followed by lots (of the same type)

I'm really stucked by this problem !

Thanks for help !

Gilles

PS : I'm using gcc under linux.