id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
11680,boost::polygon::connectivity_extraction<int>::extract crashes when no polygons were inserted,mhilferink@…,Lucanus Simonson,"steps to reproduce:

{{{#!C++
#include <boost/polygon/polygon.hpp>
int main() {
  boost::polygon::connectivity_extraction<int> ce;
  std::vector<std::set<int> > graph;
  ce.extract(graph); // causes access violation
}
}}}
The debugger indicates an access violation in 

{{{#!C++
    template <typename iT>
    static inline void compute_histogram_in_y(iT begin, iT end, std::size_t size, std::vector<std::pair<Unit, std::pair<std::size_t, std::size_t> > >& histogram);

}}}

Apparently, the original coder assumed (incorrectly?) that the given size != 0.

a simple 'if' would probably resolve this I do in my client code as well.
I just wonder what the best level would be to introduce this if:
- connectivity_extraction::extract
- arbitrary_connectivity_extraction::execute
- or better in boost::polygon::line_intersection<T>::validate_scan ?",Bugs,new,To Be Determined,polygon,Boost 1.58.0,Problem,,,