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[sg <>]

I am implementing some code in CGAL. I made an arrangement. Now I want to add
some data to every face in arrangement. So i access a face by below method.
It return const handle. So i try to convert this to non_const_handle. But it
show error that " cannot call member function without object."

    const Face_const_handle* f;
    if(f = boost::get<Face_const_handle>(&(it->second))){
        Arrangement_2::Face_handle fh = Arrangement_2::non_const_handle(*f);
// ERROR HERE
        for(int i=1;i<convexPts.size();i++){
            CGAL::Gmpq temp =
CGAL::squared_distance(convexPts[0],convexPts[i]);
            if(temp>max){
                max = temp;
                fh->set_data(max);
            }
       }
   }





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