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

Agern Allé 24

2970 Hørsholm

Denmark

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