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["陈剑锋" <>]

Just this code .
I modify the code segment.
When Debug version , it run ok.
But Release version ,it run bad. The Result is not right.Why?


///////////////////////////////////////////////////

/*! \file simple_join_intersect.cpp
* Computing the union and the intersection of two simple polygons.
*/

#include "bso_rational_nt.h"
#include <CGAL/Cartesian.h>
#include <CGAL/Boolean_set_operations_2.h>
#include <list>

// instead of
//typedef CGAL::Cartesian<Number_type>               Kernel;
// workaround for VC++
struct Kernel : public CGAL::Cartesian<Number_type> {};

typedef Kernel::Point_2                            Point_2;
typedef CGAL::Polygon_2<Kernel>                    Polygon_2;
typedef CGAL::Polygon_with_holes_2<Kernel>         Polygon_with_holes_2;
typedef std::list<Polygon_with_holes_2>            Pwh_list_2;

#include "print_utils.h"

int main ()
{
	// Construct the two input polygons.
	Polygon_2 P;
	//P.push_back (Point_2 (0, 0));
	//P.push_back (Point_2 (5, 0));
	//P.push_back (Point_2 (3.5, 1.5));
	//P.push_back (Point_2 (2.5, 0.5));
	//P.push_back (Point_2 (1.5, 1.5));
	P.push_back (Point_2 (0,  0));
	P.push_back (Point_2 (10, 0));
	P.push_back (Point_2 (10,10));
	P.push_back (Point_2 (0, 10));
	//P.reverse_orientation();

	std::cout << "P = "; print_polygon (P);

	Polygon_2 Q;
	//Q.push_back (Point_2 (0, 2));
	//Q.push_back (Point_2 (1.5, 0.5));
	//Q.push_back (Point_2 (2.5, 1.5));
	//Q.push_back (Point_2 (3.5, 0.5));
	//Q.push_back (Point_2 (5, 2));
	Q.push_back (Point_2 (1,1));
	Q.push_back (Point_2 (1,5));
	Q.push_back (Point_2 (5,5));
	Q.push_back (Point_2 (5,1));


	std::cout << "Q = "; print_polygon (Q);

	//// Compute the union of P and Q.
	//Polygon_with_holes_2 unionR;

	//if (CGAL::join(P, Q, unionR)) 
	//{
	//	std::cout << "The union: ";
	//	print_polygon_with_holes (unionR);
	//}
	//else
	//	std::cout << "P and Q are disjoint and their union is trivial."
	//	<< std::endl;
	//std::cout << std::endl;

	// Compute the intersection of P and Q.
	Pwh_list_2                  intR;
	Pwh_list_2::const_iterator  it;

	try
	{
		CGAL::difference(P, Q, std::back_inserter(intR));//intersection
	}
	catch (...)
	{
		Q.reverse_orientation();
		CGAL::difference(P, Q, std::back_inserter(intR));//intersection
	}
	

	std::cout << "The intersection:" << std::endl;
	for (it = intR.begin(); it != intR.end(); ++it) 
	{
		std::cout << "--> ";
		print_polygon_with_holes (*it);
	}


	return 0;
}

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