#include <iostream>
#include <boost/polygon/polygon.hpp>
#include <cassert>
namespace gtl = boost::polygon;
using namespace boost::polygon::operators;

//lets construct a 10x10 rectangle shaped polygon
typedef gtl::polygon_data<int> Polygon;
typedef gtl::polygon_traits<Polygon>::point_type Point;
typedef gtl::polygon_set_data<int> PolygonSet;
typedef std::vector<Polygon> PolyDataSet;
	
void getOBS(Polygon &oPrboundary, PolyDataSet &pinGroup)
{
	PolygonSet o_full_set;
	o_full_set.insert(oPrboundary, false);
	
	foreach (Polygon o_item, pinGroup)
	{
		//o_full_set.insert(o_item, true); // Insert As Hole, which works in 1_53 but not in 1_56
		o_full_set -= o_item; // works in 1_53 and 1_56
	}
	
	PolyDataSet o_OBS_set;
	o_full_set.get(o_OBS_set);
	
	for (int i = 0; i < o_OBS_set.size(); ++i)
	{
		Polygon o_poly = o_OBS_set.at(i);
		std::vector<Point> poly_points;
		poly_points.insert(poly_points.end(), o_poly.begin(), o_poly.end());
		foreach(Point o_pos, poly_points)
		{
			std::cout << "(" << o_pos.x() << ", " << ") ";
		}
		std::cout << std::endl;
	}
}