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[stzpz <>]

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

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