CGAL users discussion list

[Torchi Borchi <>]

i would like to try mpq_class but:

#include <CGAL/gmpxx.h>
typedef mpq_class RT;
typedef CGAL::Cartesian<RT> K;

this does not work. how can use mpq_class to get a kernel?
i cant find any documentation or example.

i see also that #include <CGAL/gmpxx.h> is including
#include <gmpxx.h>

gmpxx.h is missing in CGAL-3.4-Setup.exe

i downloaded gmp-4.3.1 and added the path to gmpxx.h.
but i still dont know how to make a kernel out of mpq_class.


Sylvain Pion schrieb:
> torchi borchi wrote:
> > i followed your suggestion and tried this:
> >
> > typedef CGAL::Gmpq RT;
> > typedef CGAL::Simple_cartesian<RT> K;
> >
> > but it still crashes. is Gmpq using reference counting?
>
> Yes, it uses the same thread-unsafe mechanism.
>
> > i need exact constructions.
>
> Try mpq_class instead of Gmpq ?
> Or Quotient<MP_Float>, but that can be much slower.
>
> Otherwise, someone needs to bite the bullet and fix
> the reference counting mechanism (in <CGAL/Handle_for.h>).