CGAL users discussion list

[gunshi gupta <>]

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

sample code:

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

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