CGAL users discussion list

[Asher Kamiraze <>]

Le 7 octobre 2011 21:53, Ben Supnik <> a écrit :

What kernel are you templated against?

Oups, sorry, I forgive this part ... 

In the first version, I used a Cartesian<double> kernel. I then switched to an Exact_predicates_exact_constructions_kernel

I also forgive to mention that the crash appears in 

/// Arr_walk_along_line_pl_impl.h

template <class Arrangement>

bool Arr_walk_along_line_point_location<Arrangement>::

_is_in_connected_component (const Point_2& p,

                            Ccb_halfedge_const_circulator circ,

                            bool shoot_up,

                            bool inclusive,

                            Halfedge_const_handle& closest_he,

                            bool& is_on_edge,

                            bool& closest_to_target) const

line 525:

if (! is_vertical (first->curve()))

Regards,

Asher

On 10/7/11 3:47 PM, Asher Kamiraze wrote:

Hi all,

I am facing a problem with a piece which used to work but which now crashes.
Here is the method a segmentation fault:

void  myobject::build_arr(const  string&  path,  double  tolerance)

{

    /// Here, we read the polygons from a file -->  m_rectangles


    vector<Polygon_2>::const_iterator  itb  =  m_rectangles.begin(),  ite  =  m_rectangles.end();

    for(;itb!=ite;++itb)

    {

        Polygon_2::Edge_const_iterator  e  =  itb->edges_begin(),  ite_edges  =  itb->edges_end();

        for(;e!=ite_edges;++e)

        {

            Vector_2  v  =  e->to_vector();

            double  d  =  sqrt(CGAL::to_double(v.squared_length()));

            v  =  (tolerance  /  d)  *  v  ;

            std::cout  <<  v  <<  std::endl;

            std::cout  <<  Segment_2(e->source()-v,  e->target()+v)  <<  std::endl;

            CGAL::insert(m_arr,  Segment_2(e->source()-v,  e->target()+v)); /// Whatever the dataset is, the second call to CGAL::insert causes a segmentation fault

        }

    }

}


Here is the output on the console with one of my dataset:

45.5953 20.5199

387.269 239.624 506.547 293.304

-20.5199 45.5953

481.472 227.189 407.029 392.6


There is no duplicate point. I am on a linux ubuntu 11.04, g++ 4.5.2 and
CGAL 3.7 (I compiled it myself).
The same code used to work on the same machine, with an ubuntu 10.04
(cannot remember g++ version ...), and CGAL 3.7 also compiled by myself.

Do you have any idea on what the problem is?

Regards,

Asher

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