#include <boost/assert.hpp>
#include <boost/geometry.hpp>

#include <boost/geometry/geometries/point_xy.hpp>

typedef boost::geometry::model::d2::point_xy<float> point_type;
typedef boost::geometry::model::polygon<point_type> polygon_type;

int main()
{
    polygon_type p_valid, p_invalid;
    boost::geometry::read_wkt("POLYGON((0 3,3 3,3 1,2 1,2 2,1 2,\
    1 1,2 1,2 0,0 0,0 3))", p_invalid);

    BOOST_ASSERT(! boost::geometry::is_valid(p_invalid));

    boost::geometry::read_wkt("POLYGON((0 3,3 3,3 1,2 1,2 0,0 0,0 3),\
    (2 1,2 2,1 2,1 1,2 1))", p_valid);

    BOOST_ASSERT(boost::geometry::is_valid(p_valid));

    return 0;
}