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Hi 
I am very novice with cgal and have a very hard time with all  this 
templates. 

I got so far , that i got modified the" boolean_operations_2" example  to fit
for me. 

but when I join , I get some vertex totally wrong . 
http://i39.tinypic.com/vcvscj.jpg

I then would like to make a very small test app for bug reporting , but
struggle with reading back the ascii format again : (have appx 221 ) of this
kind

6 [62286 122530 --> 59786 125030]
 [59786 125030 --> 48166 125030]
 [48166 125030 --> 45666 122530]
 [45666 122530 --> 48166 120030]
 [48166 120030 --> 59786 120030]
 [59786 120030 --> 62286 122530]

Polygon_2  p ;
instream >>p;   // not possible since  no >> avaible. 

how to do ?? 
even my kernel supports circle , I only use segment for the moment. 

Best regards
Buller

my type defs are : 
 typedef CGAL::Gmpq                                    Base_nt;
typedef CGAL::Lazy_exact_nt<Base_nt>                  Coord_type;
struct Kernel : public CGAL::Cartesian<Coord_type> {};

typedef Kernel::Segment_2                             Segment;
typedef Kernel::Point_2                               Point_2;
typedef Kernel::Circle_2                              Circle;
typedef Kernel::Iso_rectangle_2                       Iso_rectangle;

typedef CGAL::Gps_circle_segment_traits_2<Kernel>     Traits;
typedef Traits::Curve_2                               Curve;
typedef Traits::X_monotone_curve_2                    XCurve;
typedef Traits::Point_2                               Circular_point_2;
typedef Traits::Polygon_2                             Polygon_2;
typedef CGAL::General_polygon_with_holes_2<Polygon_2> Polygon_with_holes;
typedef CGAL::General_polygon_set_2<Traits>           Polygon_set;
typedef Polygon_with_holes::Hole_const_iterator       Hole_const_iterator;


typedef CGAL::Polygon_2<Kernel>                       Linear_polygon_2;
typedef CGAL::Polygon_with_holes_2<Kernel>           
Linear_polygon_with_holes_2;