[Boost::Polygon]多边形相减得到新的多边形序列

#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;
    }
}