Hi,

 

Unfortunately I have not hear from you in this regard. It seems that I still cannot reliably reproduce the issue, but when it occurs, it occurs in the following scenario. Apparently, something is broken in your memory management:

 

{      // RT#8837

       _intPolygon polygonA;

       boost::geometry::read_wkt("MULTIPOLYGON(((488 2035,527 2035,527 2093,488 2093)))", polygonA); // does not throw

 

       _intRect rectB;

       boost::geometry::read_wkt("BOX(417 2064,597 2064)", rectB); // does not throw

 

       _intPolygon polygonC;

       boost::geometry::difference(polygonA, rectB, polygonC); // ACCESS VIOLATION

}

 

Maybe you could make an effort and step through this simple example once to see if everything works as expected?

 

I understand that the box and/or the polygon may not conform to all requirements (not spike-free etc.) but in any case, IMO the geometry library should not crash with a memory fault.

 

As always, my points are based on int and my polygons are counter-clockwise and not closed.

 

Regards

   Volker

 

 

--
Volker Schöch | vschoech@think-cell.com
Senior Software Engineer

We are looking for C++ Developers: http://www.think-cell.com/career

From: Geometry [mailto:geometry-bounces@lists.boost.org] On Behalf Of Volker Schöch
Sent: Freitag, 17. Oktober 2014 16:20
To: Boost.Geometry library mailing list (geometry@lists.boost.org)
Subject: [geometry] access violation in update_discarded(...)

 

Hi,

 

we have seen an access violation deep inside boost geometry. We are still working on a simple reproduction, which may take while. In the meantime, maybe you have some idea what went wrong, or some suggestion how to avoid this situation?

 

Here is where it happened:

 

template<typename Turns, typename Operations>

inline void update_discarded(Turns& turn_points, Operations& operations)

{

    // Vice-versa, set discarded to true for discarded operations;

    // AND set discarded points to true

    for (typename boost::range_iterator<Operations>::type it = boost::begin(operations);

         it != boost::end(operations);

         ++it)

    {

        if (turn_points[it->index].discarded) <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< access violation

        {

            it->discarded = true;

        }

        else if (it->discarded)

        {

            turn_points[it->index].discarded = true;

        }

    }

}

 

Please find the callstack attached.

 

Regards

   Volker

--
Volker Schöch | vschoech@think-cell.com
Senior Software Engineer

We are looking for C++ Developers:http://www.think-cell.com/career

---

think-cell Software GmbH	http://www.think-cell.com
Chausseestr. 8/E	phone / fax	+49 30 666473-10 / -19
10115 Berlin, Germany	US phone / fax	+1 800 891 8091 / +1 212 504 3039
Amtsgericht Berlin-Charlottenburg, HRB 85229 | European Union VAT Id DE813474306
Directors: Dr. Markus Hannebauer, Dr. Arno Schödl

 

_______________________________________________
Geometry mailing list
Geometry@lists.boost.org
http://lists.boost.org/mailman/listinfo.cgi/geometry