CGAL users discussion list

[Martin Baeker <>]

Thanks a lot for the information, that will be helpful.

I'm thinking of adding a kind of global output-parameter which I can
switch to switch the output in the desired way, so the line would look
somewhat like

if (doTheDoubleOutput)
  return s << to_double(r);
else
  return s << r;

This should hopefully not get me into too much trouble.

Might perhaps be even nicer to add this functionality to the stream
itself so that different streams can get different output styles. This
could probably be done similarly to the IO::mode-stuff where you can
do pretty-printing or binary output, right?

Best regards,

Martin.

> > 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.
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