CGAL users discussion list

[Sylvain Pion <>]

Thomas Zangl a écrit :
> Thomas Zangl wrote:
> > I use the "Exact_predicates_exact_constructions_kernel" Kernel and I
> > need the sqrt function. The manual told me to use the
> > Exact_predicates_exact_constructions_kernel_with_sqrt kernel and now I
> > get the following compile error:
>
> Or an alternative might be: how to compute the sqrt using the
> Exact_predicates_exact_constructions_kernel numbertype
> (lazy_exact<CGAL::gmpq>)?

If it is enough for you to have an approximate sqrt, then:

typedef Exact_predicates_exact_constructions_kernel::FT FT;

...

  FT x;
  ...
  FT sqrt_of_x = FT(std::sqrt(CGAL::to_double(x)));

--
Sylvain Pion
INRIA Sophia-Antipolis
Geometrica Project-Team
CGAL, http://cgal.org/