CGAL users discussion list

[Andreas Fabri <>]

Bart Janssens wrote:
> On 9/28/07, Tom Bobach 
> <>
>  wrote:
> > Dear CGAL community,
> >
> > I am facing the problem that in the default halfedge data structure
> > implementation there is no comparison operator defined for handles and
> > iterators.
> > This makes usage of Handles in std::set and std::map unnecessarily
> > complicated. I am wondering if someone else faced this problem and if there
> > is an easy, non-intrusive way to fix this.
>
> I got around the problem using probably the least elegant, but easiest
> solution: I dereferenced the handle, and then stored the address of
> the resulting object in an std::map, i.e. map[&(*handle)] = blah;
>
> regards,

Hello,

You can define

  bool operator< ( const Handle& x, const Handle& y )
  {
    return &*x < &*y ;
  }


As the std::map takes std::less as default comparason functor
and this one applies operator<   this solves all these problems.


andreas