CGAL users discussion list

[Efi Fogel <>]

Martin Baeker wrote:
> Dear Efi,
>
> thanks a lot for your patience. I think I am getting closer, but one
> thing is still not working. 
>
> I am using the following code fragment:
>
>   Arr_2::Induced_edge_iterator eit;
>   for (cit = arr.curves_begin(); cit != arr.curves_end(); ++cit) 
>   {
>     std::cout << std::endl << "Curve level:" << std::endl << *cit
>               << std::endl ;
>     std::cout << "Edge level:" << std::endl;
>     //traversal of the edges of the current curve
>     for (eit = arr.induced_edges_begin(cit); eit != arr.induced_edges_end(cit); ++eit) 
>     {
>       std::cout << eit->curve() << std::endl ; // ERROR
>     }
>   }
>
> However, when I try to compile this, the compiler complains about the line
> marked with ERROR because 
> eit "has no element called curve()".
>
> I am puzzled by this because the manual says that
> Induced_edge_iterator returns a halfedge handle, and this does have a
> curve() function, doesn't it?
>   
I believe it says that the value type of Induced_edge_iterator is 
Halfedge_handle, so the correct statement should be:

   std::cout << (*eit)->curve() << std::endl;

> The following construction works:
>  Arr_2::Edge_iterator                  eit2;
>  for (eit2 = arr.edges_begin(); eit2 != arr.edges_end(); ++eit2)
>   {
>     std::cout << "[" << eit2->curve() << std::endl;
>   }
>  
> but for my application I want to travel over the edges curve-wise. Can
> you tell me how I have to do it to make it work?
>
>
> BTW, there is a small typo in the manual:
> The class is not
> Arrangement_with_history_2::Induced_edges_iterator
> but
> Arrangement_with_history_2::Induced_edge_iterator
> Would be nice if you could correct this.
>
> Thanks again,
>
> Martin.
>
>
>                    Priv.-Doz. Dr. Martin Bäker
>                    Institut für Werkstoffe
>                    Technische Universität Braunschweig
>                    Langer Kamp 8
>                    38106 Braunschweig
>                    Germany
>                    Tel.: 00-49-531-391-3073
>                    Fax   00-49-531-391-3058
>                    e-mail <>-- 
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