CGAL users discussion list

[Bernd Gaertner <>]

Martin Baeker wrote:
> Is it possible to change the output format so that instead of points
> being output as fractions when using exact number types, they get
> automatically converted to doubles, so that I would get
>
> 84.20...    instead of
>  9.5827368501575693e+20/1.1379770555658617e+19
>
> I'm using these number types
>  typedef CGAL::Quotient<CGAL::MP_Float>                      NT;
>  typedef CGAL::Cartesian<NT>                                 TutorialR;

No, this is not possible. The quotient always outputs itself as 
numerator/denominator (not much else would make sense in general).

> If this functionality is not provided, would it be possible to change
> the definition of operator<<?If so, where would I find it?

The operator is defined in the file include/CGAL/Quotient.h. You would 
need to change its body to "return s << to_double(r);" I would recommend 
to invent a new function for this, though, instead of changing CGAL code.

Best,
Bernd.