CGAL users discussion list

[Marc Glisse <>]

On Tue, 8 Dec 2015, vimarsh wrote:

> I wanted to use a Plane_3 as the key value in a std::map, so i passed the
> third argument to the map as:
>
> typedef CGAL::Lazy_exact_nt<CGAL::Gmpq>                         NT;
> typedef CGAL::Extended_cartesian<NT>                                 K;
> typedef K::Plane_3
> Plane3;
>
> It does not work if i just do std::map<Plane3,int>,(so i guess it is not
> derived from LessComparable), and i tried passing CGAL::Plane_lt as the
> third argument, but later realised that is only for RingType while my kernel
> uses a FieldType.

Uh? A field is a ring. Could you show a minimal program and the error you 
got?

> How can i achieve what i want with my kernel?
> (I also tried replacing the RT with FT, after copying how Plane_lt is
> defined, in my code, but that didn't work either )

"doesn't work" doesn't help.

--
Marc Glisse