Geometry Boost List: [geometry] Dissolve ... exception

Subject: [geometry] Dissolve ... exception
From: Johan Doré (jdh_at_[hidden])
Date: 2018-08-19 14:57:37

Dear Boost Geometry

One of our customers experienced a crash which I was able to trance down to a non-std::exception thrown when using the dissolve function with version 1.66.
In addition I see the same error when I download your latest Developer Branch from GitHub and put it on top of Boost Version 1.66

I therefore implemented a test case for you reproducing the error:

BOOST_AUTO_TEST_CASE(Boost_Dissolve_ThowsException)
{
polygon<point_xy<float>> Poly;
       read_wkt("POLYGON((13.78 -2.18,"
                                                                  " 7.04 -2.33,"
                                                                  " 7.08 -2.33,"
                                                                  "16.05 -0.55,"
                                                                  "16.46 -6.08,"
                                                                  "16.99 -5.82,"
                                                                  " 2.92 -1.99,"
                                                                  "15.14 -1.65,"
                                                                  "17.41 -4.42,"
                                                                  "13.78 -2.18))", Poly);

multi_polygon<polygon<point_xy<float>>> Result;

       int Catched = 0;
       try
       {
              boost::geometry::dissolve(Poly, Result);
       }
       catch (const std::exception& /*ex*/)
       {
             Catched = 1;
       }
       catch (...)
       {
             Catched = 2;
       }

       BOOST_CHECK(Catched == 2);
}

When I run this using Visual C++ 2013 with C++ Exceptions set to “Yes with SHE Exceptions (/EHa)” I can catch the error in the catch(…) statement.

In addition I get the following info in the debug output:


1>   Assertion failed: id.ring_index >= -1 && id.ring_index < int(boost::size(interior_rings(polygon))), file c:\program files (x86)\boost\boost_1_66_0\boost\geometry\algorithms\detail\overlay\get_ring.hpp, line 89

I hope you can use this to make this great library even better.

Thanks a lot

Johan Doré
CTO, Vice President

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2970 Hørsholm
Denmark
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