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[phygeeks <>]

Hi, I posted a question at StackOverflow, which I will reproduce here. I
would be really grateful for any help in this matter.
====
I have the following code that is successfully compiled and executed with
CGAL4.2.

cgal_intersection.h
----
    typedef struct {double x; double y;} coordinate;
    
    int cgal();
    
    extern "C" int find_intersections_of_curves(
        coordinate *curve_1, long curve_1_size,
        coordinate *curve_2, long curve_2_size,
        coordinate *intersections, int max_num_of_intersections);
----
cgal_intersection.cpp
----
    #include <CGAL/Cartesian.h>
    #include <CGAL/Arr_segment_traits_2.h>
    #include <CGAL/Arr_polyline_traits_2.h>
    #include <CGAL/Sweep_line_2_algorithms.h>
    #include <vector>
    #include <list>
    
    #include "cgal_intersection.h"
    
    typedef CGAL::Cartesian<double>                    Kernel;
    typedef CGAL::Arr_segment_traits_2<Kernel>              Segment_traits;
    typedef CGAL::Arr_polyline_traits_2<Segment_traits>     Traits;
    typedef Traits::Point_2                                 Point;
    typedef Traits::Curve_2                                 Polyline;
    
    extern "C" int find_intersections_of_curves(
        coordinate *curve_1, long curve_1_size,
        coordinate *curve_2, long curve_2_size,
        coordinate *intersections, int max_num_of_intersections)
    {
    
        std::vector<Point> points_1(curve_1_size);
        for (long i_1 = 0; i_1 < curve_1_size; i_1++)
            points_1[i_1] = Point(curve_1[i_1].x, curve_1[i_1].y);
        Polyline  polyline_1(points_1.begin(), points_1.end());
    
        std::vector<Point> points_2(curve_2_size);
        for (long i_2 = 0; i_2 < curve_2_size; i_2++)
            points_2[i_2] = Point(curve_2[i_2].x, curve_2[i_2].y);
        Polyline  polyline_2(points_2.begin(), points_2.end());
    
        Polyline polylines[] = {polyline_1, polyline_2};
        std::list<Point> intersection_points;
        CGAL::compute_intersection_points(polylines, polylines + 2,
                                         
std::back_inserter(intersection_points));
    
        int num_of_intersections = intersection_points.size();
        Point intersection_point;
        for (int j = 0; j < num_of_intersections; j++){
            if (j == max_num_of_intersections)
                break;
            intersection_point = intersection_points.front();
            intersections[j].x = intersection_point.x();
            intersections[j].y = intersection_point.y();
            intersection_points.pop_front();
        }
    
        return num_of_intersections;
    }
----
But when using CGAL4.6, I get a compile error like the following:
----
    Scanning dependencies of target cgal_intersection
    [100%] Building CXX object
CMakeFiles/cgal_intersection.dir/cgal_intersection.cpp.o
    In file included from
/home/chan/mose/mose/cgal_intersection/cgal_intersection.cpp:5:0:
    /usr/include/CGAL/Sweep_line_2_algorithms.h: In instantiation of
‘OutputIterator CGAL::compute_intersection_points(CurveInputIterator,
CurveInputIterator, OutputIterator, bool) [with CurveInputIterator =
CGAL::polyline::Polyline_2<CGAL::Arr_segment_2&lt;CGAL::Cartesian&lt;double>
>, CGAL::Point_2<CGAL::Cartesian&lt;double> > >*; OutputIterator =
std::back_insert_iterator<std::list&lt;CGAL::Point_2&lt;CGAL::Cartesian&lt;double>
> > >]’:
    /home/chan/mose/mose/cgal_intersection/cgal_intersection.cpp:36:78:  
required from here
    /usr/include/CGAL/Sweep_line_2_algorithms.h:134:48: error: no type named
‘Traits’ in ‘struct
CGAL::Default_arr_traits<CGAL::polyline::Polyline_2&lt;CGAL::Arr_segment_2&lt;CGAL::Cartesian&lt;double>
>, CGAL::Point_2<CGAL::Cartesian&lt;double> > > >’
       typename Default_arr_traits<Curve>::Traits   traits;
                                                    ^
    /usr/include/CGAL/Sweep_line_2_algorithms.h:134:48: error: no type named
‘Traits’ in ‘struct
CGAL::Default_arr_traits<CGAL::polyline::Polyline_2&lt;CGAL::Arr_segment_2&lt;CGAL::Cartesian&lt;double>
>, CGAL::Point_2<CGAL::Cartesian&lt;double> > > >’
    make[2]: *** [CMakeFiles/cgal_intersection.dir/cgal_intersection.cpp.o]
Error 1
    make[1]: *** [CMakeFiles/cgal_intersection.dir/all] Error 2
    make: *** [all] Error 2
----
I looked into the header files but I don't see why it works in CGAL4.2 but
fails in CGAL4.6. I would be grateful for any help.



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