id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11679	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