CGAL users discussion list

[Marc Glisse <>]

On Tue, 8 Dec 2015, gunshi gupta wrote:

> Okay, apologies, i guess the confusion regarding field and ring type was
> due to some misinterpretation while reading the kernel manual.
> sample code:

Please don't post "sample code" but something that we can directly 
copy-paste in a file and compile. Also post the errors you are getting. If 
I try to complete your program, it seems to work, so it is quite possible 
that your problem is precisely with the #includes, i.e. something you did 
not show...

> typedef CGAL::Lazy_exact_nt<CGAL::Gmpq>
>        NT;
>
> typedef CGAL::Simple_cartesian<NT>
>         K;//tried with Extended cartesian as well
>
> typedef K::Point_3
>        Point3;
>
> typedef K::Plane_3
>        Plane3;
>
>    std::map<Plane3, int,CGAL::Plane_lt> planes;
>
>    planes[Plane3(Point3(12,0,0),Point3(0,6,0),Point3(0,0,8))]=2;
>
>    std::cout<<planes[Plane3(Point3(6,3,0),Point3(0,3,4),Point3(6,0,4))];
>
>
> //output: 0
>
> //Plane3(Point3(6,3,0),Point3(0,3,4),Point3(6,0,4))==Plane3(Point3(12,0,0),
> Point3(0,6,0),Point3(0,0,8)) returns true
>
> On Tue, Dec 8, 2015 at 9:06 PM, Marc Glisse 
> <>
>  wrote:
>
> > 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

--
Marc Glisse