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I am working with the circular kernel
I build classes that inherit from circular_arc and circular_line;
these new classes do not allocate any memory (just implement some getters)

To make my problem clear I am posting my main header with some comments:


------------------------------------------------------------------ common.h

#ifndef COMMON_H
#define COMMON_H

#include <CGAL/Exact_circular_kernel_2.h>
#include <CGAL/Arr_circular_line_arc_traits.h>
#include <CGAL/Arr_extended_dcel.h>
#include <CGAL/Arrangement_2.h>
#include <CGAL/Arr_naive_point_location.h>

typedef double                                          NT;      // for debug
typedef CGAL::Cartesian<NT>                             Linear_k;
typedef CGAL::Algebraic_kernel_for_circles_2_2<NT>      Algebraic_k;
typedef CGAL::Circular_kernel_2<Linear_k,Algebraic_k>   Circular_k;

typedef CGAL::Orientation                               Orientation;
typedef Circular_k::Line_2                              Line;
typedef Circular_k::Point_2                             Pnt;
typedef Circular_k::Circular_arc_point_2                Point;
typedef Circular_k::Circle_2                            Disk;
typedef Circular_k::Circular_arc_2                      Circular_arc;
typedef Circular_k::Line_arc_2                          Line_arc;

#include "Directed_arc.h"            // class that inherits from Circular_arc
#include "Directed_line.h"           // class that inherits form Line_arc

typedef boost::variant<Directed_arc, Directed_line>     Arc;
typedef std::vector<Arc>                                ArcList;

typedef CGAL::Arr_circular_line_arc_traits
        <Circular_k, Directed_arc, Directed_line>       Arc_traits;
typedef Arc_traits::Curve_2                             Curve;
typedef CGAL::Arr_extended_dcel
        <Arc_traits, int, int, bool>                    Arc_dcel;
typedef CGAL::Arrangement_2<Arc_traits, Arc_dcel>       Arrangement;
typedef CGAL::Arr_naive_point_location<Arrangement>     Point_loc;

#endif

-----------------------------------------------------------------------------



Now everything goes fine in Compiletime, no warnings, nothing;
But when I try to add a curve of type variant<Directed_arc,Directed_line>
to an Arrangement, I get immediatly a Segmentation fault.

If I replace the Directed_arc and Directed_line above by Circular_arc and
Line_arc then everything works fine. Can't I use the inherited classes here?
Has anyone experienced a similar problem in perhaps another kernel?
Do I have to add further specifications to the Arr_extended_dcel?

Thank you in advance
mfg, Wolfgang