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
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
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