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[Efi Fogel <>]

Hi Morteza,

If you really need to convert Arrangement_with_history_2 to Arrangement_2, then you would need to reconstruct Arrangement_2, but conceptually, everything you can do with Arrangement_2 you can also do with Arrangement_with_history_2.

Is it possible that you simply forgot to include the header that contains the definition of CGAL::Dual, namely, <CGAL/graph_traits_Dual_Arrangement_2.h> ?

Anyway, if you still have a problem, please paste a complete minimal program.

Efi

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On Sat, 25 Aug 2018 at 16:00, Morteza Manavi <> wrote:

Hi, I want to use Dual class to construct a dual graph of my arrangement, but I get the compile error :

C2079: 'dual' uses undefined class 'CGAL::Dual<Arr_with_hist_2>'

and I think it's for Arrangement_with_history_2 that I use to define the arrangement in the code. Now I need to convert Arr_with_hist_2 to Arrangement_2 and I don't know how to do this?

my CGAL type definition :

typedef CGAL::Cartesian<CGAL::Exact_rational>                   Kernel;

typedef Kernel::Circle_2                                        Circle_2;

typedef Kernel::Segment_2                                       Segment_2;

typedef CGAL::Arr_circle_segment_traits_2<Kernel>         Circle_Segment_traits_2;

typedef std::string                                       Curve_Name;

typedef CGAL::Arr_consolidated_curve_data_traits_2

                   <Circle_Segment_traits_2, Curve_Name>  Traits_2;

typedef Traits_2::Point_2                                 TPoint_2;

typedef Traits_2::Curve_2                                 Curve_2;

typedef Traits_2::CoordNT                                 CoordNT;

typedef CGAL::Arr_face_extended_dcel<Traits_2 , unsigned int>   Dcel ;

typedef CGAL::Arrangement_with_history_2<Traits_2, Dcel>        Arr_with_hist_2;
typedef CGAL::Dual<Arr_with_hist_2>                             Dual_arrangement;
typedef CGAL::Arr_face_index_map<Arr_with_hist_2>               Face_index_map;