CGAL users discussion list

[Eric Berberich <>]

stzpz wrote:
> Hello all,
>
> I want to use Arr_Bezier_curve_traits_2 arrangement with an auxiliary data
> attached to each Bezier curve, so I use Arr_curve_data_traits_2 for that
> with the following code:
>
> // ==== Code begin ====
> #include <CGAL/basic.h>
> #include <CGAL/Cartesian.h>
> #include <CGAL/CORE_algebraic_number_traits.h>
> #include <CGAL/Arr_Bezier_curve_traits_2.h>
> #include <CGAL/Arrangement_2.h>
> #include <CGAL/Arr_curve_data_traits_2.h>
>
> typedef CGAL::CORE_algebraic_number_traits              Nt_traits;
> typedef Nt_traits::Rational                                       NT;
> typedef Nt_traits::Rational                                       Rational;
> typedef Nt_traits::Algebraic                                     Algebraic;
> typedef CGAL::Cartesian<Rational>                           Rat_kernel;
> typedef CGAL::Cartesian<Algebraic>                         Alg_kernel;
> typedef CGAL::Arr_Bezier_curve_traits_2<Rat_kernel, Alg_kernel, Nt_traits>   
> Traits_org_2;
> typedef CGAL::Arr_curve_data_traits_2<Traits_org_2, unsigned int>             
> Traits_2;
>
> // *** Compile error on the following line ***
> typedef Traits_2::Curve_2                               Bezier_curve_num_2;
> // *** Compile error on the above line ***
>
> typedef CGAL::Arrangement_2<Traits_2>                   Arrangement_2;
>
> int main()
> {
>     return 0;
> }
> // ==== Code end ====
>
> But this simple program can not compile successfully with the following
> message:
>
> /home/stzpz/testcgal/test.cpp:19:   instantiated from here
> /usr/include/CGAL/Arr_curve_data_traits_2.h:86: error: no type named
> 'Multiplicity' in 'class
> CGAL::Arr_Bezier_curve_traits_2<CGAL::Cartesian<CORE::BigRat>,
> CGAL::Cartesian<CORE::Expr>, CGAL::CORE_algebraic_number_traits,
> CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > >'
>
> I think the problem is caused by the following line,
>      typedef Traits_2::Curve_2                              
> Bezier_curve_num_2;
> but I don't know how to fix it.
>
> Is there any suggestion?
>
> Thanks!
>
> Stzpz


Apply the following fix. We we solve the issue for the next public release.

eriC


Index: Arr_Bezier_curve_traits_2.h
===================================================================
--- Arr_Bezier_curve_traits_2.h (revision 60761)
+++ Arr_Bezier_curve_traits_2.h (working copy)
@@ -99,6 +99,9 @@
                           Nt_traits,
                           Bounding_traits>             Point_2;

+  typedef unsigned int                                 Multiplicity;
+
+