CGAL users discussion list

[Ben Strasser <>]

Hello,

the following program crashes for me:

#include <CGAL/Cartesian.h>
#include <CGAL/Arrangement_2.h>
#include <CGAL/Arr_segment_traits_2.h>

typedef CGAL::Cartesian<double>                Kernel;
typedef CGAL::Point_2<Kernel>                Point;
typedef CGAL::Segment_2<Kernel>                Segment;
typedef CGAL::Ray_2<Kernel>                    Ray;
typedef CGAL::Vector_2<Kernel>                Vector;
typedef CGAL::Arrangement_2<CGAL::Arr_segment_traits_2<Kernel> >
                                           Arrangement;

int main(){
   Arrangement arr;
   CGAL::insert_curve(arr, Segment(Point(1.11414, 0.292881), 
Point(4.13119, 1.29114)));
   CGAL::insert_curve(arr, Segment(Point(1.11414, 0.292881), 
Point(4.29535, 0.61658)));
   CGAL::insert_curve(arr, Segment(Point(1.11414, 0.292881), 
Point(4.16702, 0.269299)));
   CGAL::insert_curve(arr, Segment(Point(1.11414, 0.292881), 
Point(1.48276, -0.458071)));
}

The output is

CGAL error: precondition violation!
Expr: _locate_around_vertex (_vertex(prev->target()), cv, MAX_END) == 
_halfedge(prev)
File: /usr/include/CGAL/Arrangement_2/Arrangement_2_functions.h
Line: 1047
Explanation:In the clockwise order of curves around the vertex, cv must 
succeed the curve of prev.
terminate called after throwing an instance of 
'CGAL::Precondition_exception'
 what():  CGAL ERROR: precondition violation!
Expr: _locate_around_vertex (_vertex(prev->target()), cv, MAX_END) == 
_halfedge(prev)
File: /usr/include/CGAL/Arrangement_2/Arrangement_2_functions.h
Line: 1047
Explanation: In the clockwise order of curves around the vertex, cv must 
succeed the curve of prev.
Aborted

I compile with
g++ -O2 bug.cpp -lCGAL -o prog

my compiler version is
g++ (Ubuntu 4.3.2-1ubuntu12) 4.3.2

What am I doing wrong?

I am uncertain as to what my exact cgal version is as I installed it 
through the package system. The package version is
3.3.1-2ubuntu1 (interpid)
I know it's not the newest version, however I'd hate to install cgal 
from the sources just to find out, that the code above still doesn't 
work. Could anyone please check if the code above works with newer versions?

Thanks for your time,
Ben Strasser