id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
7984,"In very rare cases, boost::polygon crashed or generate bad polygon when substracting 2 sets of polygons",jp.charras@…,Andrii Sydorchuk,"I am using boost:: polygon to calculate sum or difference of sets of polygons.
Recently, When calcualting the difference of 2 sets of polygons, I found 2 cases creating a serious issue:
Depending on the shape of polygons ( a slight change ""fix"" the bug) I have one case which create no polygon and one (in fact 2 samples) which crashes.

In the sample which calculate the difference between 2 polygon sets, there are 2 polygon sets: one creates no polygon, and the other crashes.

This it reproducible under Linux or Windows-gcc-mingw, with different gcc versions and boost version.
(I tried to make the polygons as simple as possible)
(see comments inside the sample).

I have used a lot boost:: polygon, and I have only 2 cases which fails
(Seems related to a particular shape, not to a polygon complexity)

Thanks to the developpers.",Bugs,assigned,To Be Determined,polygon,Boost 1.53.0,Problem,,,