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[J_Young <>]

But I got compiling error when I try to pass in a General_polygon_2 object.

1>------ Build started: Project: TestApp1, Configuration: Release Win32
------
1>  TestApp1.cpp
1>C:\Program Files\CGAL-3.9\include\CGAL/create_offset_polygons_2.h(304):
error C2039: 'Traits' : is not a member of
'CGAL::General_polygon_2<Arr_traits>'
1>          with
1>          [
1>              Arr_traits=CGAL::Arr_circle_segment_traits_2<Kernel,true>
1>          ]
1>          TestApp1.cpp(122) : see reference to function template
instantiation 'std::vector<_Ty,_Ax>
CGAL::create_interior_skeleton_and_offset_polygons_2<int,Polygon_2>(const FT
&,const Polygon &)' being compiled
1>          with
1>          [
1>              _Ty=boost::shared_ptr<Polygon_2>,
1>              _Ax=std::allocator<boost::shared_ptr&lt;Polygon_2>>,
1>              FT=int,
1>              Polygon=Polygon_2
1>          ]
1>C:\Program Files\CGAL-3.9\include\CGAL/create_offset_polygons_2.h(304):
error C3861: 'Traits': identifier not found
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========


Below is the code snippet.

#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Gps_circle_segment_traits_2.h>
#include <CGAL/create_offset_polygons_2.h>

typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
typedef Kernel::Point_2                                   Point_2;
typedef CGAL::Gps_circle_segment_traits_2<Kernel>         Traits_2;
typedef Traits_2::General_polygon_2                       Polygon_2;
typedef Traits_2::General_polygon_with_holes_2           
Polygon_with_holes_2;
typedef Traits_2::X_monotone_curve_2                     
X_monotone_curve_2;

Polygon_2 construct_polygon (const Point_2& p1, const Point_2& p2,
                             const Point_2& p3, const Point_2& p4)
{
  Polygon_2 pgn;
  X_monotone_curve_2 s1(p1, p2);    pgn.push_back(s1);
  X_monotone_curve_2 s2(p2, p3);    pgn.push_back(s2);
  X_monotone_curve_2 s3(p3, p4);    pgn.push_back(s3);
  X_monotone_curve_2 s4(p4, p1);    pgn.push_back(s4);
  return pgn;
}

int main()
{
        Polygon_2 rect1;
        rect1 = construct_polygon(Point_2(1, 0), Point_2(5, 0),
                                                        Point_2(5, 2), 
Point_2(1, 2));

        CGAL::create_interior_skeleton_and_offset_polygons_2(1, rect1);
        return 0;
}



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