CGAL users discussion list

[BBB HHH <>]

Hi Andreas and Pierre,

Thanks for your help. Things are working fine now.

Hichem

---

De : Andreas Fabri <>
À :
Envoyé le : Mercredi, 10 Décembre 2008, 12h14mn 39s
Objet : Re: [cgal-discuss] A problem with iso oriented box intersection package


Hi Hichem,

You can replace callback by operator()
and then you write

CGAL::box_self_intersection_d(boxes.begin(), boxes.end(),
                              *this, 10, CGAL::Box_intersection_d::HALF_OPEN);


Alternatively you can use std::mem_fun or std::mem_fun_ref

andreas


BBB HHH wrote:
> Hello,
>
> I am working with the CGAL::box_self_intersection_d to detect interrsections in a list of bboxes of triangles. I want to do this in an object oriented manner (inside a class). Some parts of my code are listed below. I can not compile my program since there are several errors in the line using box_self_intersection_d.
> I think the error is the use of the callback of box_self_intersection_d. In my program this callback is a class member function. In the examples provided by CGAL. The callback is a global function and the box_self_intersection_d function is called inside main(). Can someone help me to detect the problem (how to put a function object inside a class template and how to use it correctly). I tried a global function as a callback, the compile succeds but i can not acces the member data of my class.
>
> Thanks in advance
> Hichem BARKI
>
>
> #include <iostream>
> #include <vector>
> #include <list>
> #include <CGAL/intersections.h>
> #include <CGAL/Bbox_3.h>
> #include <CGAL/box_intersection_d.h>
> #include <CGAL/function_objects.h>
>
>
> using std::cout;
> using std::cin;
> using std::endl;
>
> template <class Kernel>
> class My_class
> {
> public:
>    typedef typename Kernel::FT                                            Number_type;
>    typedef typename Kernel::Point_2                                    Point_2;
>    typedef typename Kernel::Point_3                                    Point_3;
>    typedef typename std::list< Triangle_3>                                Triangles;
>    typedef typename Triangles::iterator                                            tri_it;
>      typedef CGAL::Box_intersection_d::Box_with_handle_d<double,3,tri_it> Box;
>
>
>
>        // Member data
>    Triangles                                            triangles;                    // List of the superset triangles
>        // Constructors
>    My_class(....)
>    {
>        // Fill the list of Triangles
>        .....
>
>    }
>    void  callback(const& Box a, const Box& b)
>    {
>        // DO some processing with the member data of My_class
>    }
>    void get_inters_bboxes()
>    {
>        // Create the corresponding vector of bounding boxes
>        std::vector<Box> boxes;
>        for (tri_it iter = triangles.begin(); iter != triangles.end(); ++iter)
>            boxes.push_back( Box( iter->bbox(), iter));
>
>        // Run the self intersection algorithm with all defaults
>        CGAL::box_self_intersection_d(boxes.begin(), boxes.end(), callback, 10, CGAL::Box_intersection_d::HALF_OPEN);
>    }
>      };
>
>
>

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