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[Efi Fogel <>]

Hi gilou_66,

Attached is a standalone cpp file based on your code.
It compiles and runs without a flaw.

You haven't added the complete code in your message!

You haven't mentioned which version of CGAL, os, and compiler you are using.

You haven't even mentioned your name.

Best,
Efi

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On Wed, Jan 14, 2015 at 12:36 PM, gilou_66 <> wrote:

Sebastien,

I did change to Epeck, but it did not resolve the problem.
Here is the complete code :

*.h :*

/#ifndef POLYGON_ESSAI_H
#define POLYGON_ESSAI_H

#include <CGAL/Polygon_2.h>
#include <CGAL/Polygon_traits_2.h>
#include "formvirtual.h"
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Boolean_set_operations_2.h>
#include <list>
#include "print_utils.h"

typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
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;
typedef CGAL::Polygon_traits_2<Kernel> Gp;

class Polygon_essai :public CGAL::Polygon_2<Gp>
{
     //Q_OBJECT

public:
    Polygon_essai();
    void essai();
};

#endif // POLYGON_ESSAI_H/

*.cpp :*

/#include "polygon_essai.h"

Polygon_essai::Polygon_essai()
{
}

void Polygon_essai::essai(){
    // 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));
    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));
    std::cout << "Q = "; print_polygon (Q);

    // Compute the difference of P and Q.
    Pwh_list_2 intR;
    Pwh_list_2::const_iterator it;
    CGAL::difference (P, Q, std::back_inserter(intR)); //HERE, THE PROBLEM

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





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#include <list>

#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/Polygon_traits_2.h>
#include <CGAL/Boolean_set_operations_2.h>

#include "print_utils.h"

typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
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;
typedef CGAL::Polygon_traits_2<Kernel> Gp;

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

  // Compute the difference of P and Q.
  Pwh_list_2 intR;
  Pwh_list_2::const_iterator it;
  CGAL::difference (P, Q, std::back_inserter(intR)); //HERE, THE PROBLEM

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

  return 0;
}