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[Aomandeyi <>]

thank you very much, i did as you say, the codes are as follows ,but vs2017
still report an error "no instance of function template
print_incident_halfedges matches the argument list" 
-----------------------------------------
template <typename Arrangment>
void print_incident_halfedges(typename Arrangement::Vertex_const_handle v)
{
        bool a = v->is_isolated();
        if (!a) { std::cout << "successfully using vertex_const_handle" << 
endl; }
        return;
}
int main()
{
        Point p1(1, 1), p2(1, 2), p3(2, 1);
        Segment cv[] = { Segment(p1, p2) , Segment(p2, p3) , Segment(p3, p1) 
};
        Arrangement arr;
        insert(arr, &cv[0], &cv[sizeof(cv) / sizeof(Segment)]);
        
        for (Arrangement::Vertex_const_handle v : arr.vertex_handles())
        {
                print_incident_halfedges(v);
        }
        return 0;
}
------------------------------------------
but i finally find the solution is that discard the C++'s template , as
follows ,it works!
--------------------------------------------

void print_incident_halfedges( Arrangement::Vertex_const_handle v)
{
        bool a = v->is_isolated();
        if (!a) { std::cout << "successfully using vertex_const_handle" <<
std::endl; }
        return;
}
........................



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