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Hi,
You have 2 options.
If you want to join the polygon's into a polygon set you can use the  
Gps Traits functor for constructing pwh:

GeneralPolygonSetTraits_2::Construct_general_polygon_with_holes_2

which constructs a general polygon with holes from a general polygon  
and, optionally, a range of holes. It uses the operator
General_polygon_with_holes_2  operator() (const General_polygon_2&  
pgn_boundary)
or
General_polygon_with_holes_2 operator() (const General_polygon_2&  
pgn_boundary, HolesInputIterator h_begin, HolesInputIterator h_end)
parameterized by the HolesInputIterator type.

for instance:
typedef Traits::Construct_general_polygon_with_holes_2
                                   Construct_general_polygon_with_holes_2;
Polygon_Set Gps;
Traits tr;
Construct_general_polygon_with_holes_2 functor =
                    tr.construct_polygon_with_holes_2_object ();
Polygon_with_Holes_2 pwh = functor(your_pgn);

Otherwise, simply use the PWH constructor directly:
General_polygon_with_holes_2(const General_polygon_2& pgn_boundary);

Best,

Guy

Quoting 
:

> Hi
>
> I have a list of   General_Polygons I want to convert to
> Polygon_with_holes  ,, I have tried a lot of things without luck
> ,,,,how to ?
>
>
>
> I just want to Join them  using
>
> Polygon_set pgnset;
>
> pgnset.join(ph.begin(),ph.end());
>
> typedef below.
>
> Best regards
> kim
>
> typedef Traits::Curve_2                               Curve;
> typedef Traits::X_monotone_curve_2                    XCurve;
> typedef Traits::Point_2                               Circular_point_2;
> typedef Traits::Polygon_2                             Polygon_2;
> typedef CGAL::General_polygon_2<Traits>         General_Polygon;
> typedef CGAL::General_polygon_2<Traits>         P2;
> typedef CGAL::General_polygon_with_holes_2<Polygon_2> Polygon_with_holes;
> typedef CGAL::General_polygon_set_2<Traits>             Polygon_set;
> --
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