CGAL users discussion list

["Laurent Rineau (CGAL/GeometryFactory)" <>]

Le Friday 25 April 2014 04:18:09 Tapadi a écrit :
> Hi all,
> 
> I am trying to compute Voronoi Diagrams and insert them into 2D arrangements
> (cropping them inside certain faces of the arrangement).
> I was glad to find this example on cgal.org:
> 
> *http://doc.cgal.org/latest/Triangulation_2/index.html#title15*
> 
> I saw that this example runs with the kernel:
> CGAL::Exact_predicates_inexact_constructions_kernel   (*epick*)
> 
> However, I am using:
> CGAL::Exact_predicates_exact_constructions_kernel   (*epeck*)
> 
> ... Which avoids the example from compiling properly. The problems looks
> like *epeck* not having a nested Ray_2 type while *epick* has one.
> 
> This sounds weird to me. Does the definition of a ray implies non-rational
> computations? Did I miss something?

You must be missing something. The following program does compile well with 
CGAL-4.4. That shows that Ray_2 exists as a nested type (or typedef) for both 
kernels. You should show us a minimal and consistent example that shows the 
compilation error you have. Probably you will find your answer while trying 
to 
build it. :-)

#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>

typedef CGAL::Exact_predicates_inexact_constructions_kernel Epick;
typedef CGAL::Exact_predicates_exact_constructions_kernel Epeck;

int main() {
  Epick::Ray_2 er;
  Epeck::Ray_2 ir;
  return 0;
}

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/