CGAL users discussion list

[erickee <>]

> Did you just try assigning it? For example CGAL::Gmpq automatically casts
double values. 

You are right that CGAL::Gmpq automatically converts doubles, rather than
simply truncating them.  I think that Gmpq is a model for a field type,
though.  
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/NumberTypeSupport_ref/Class_Gmpq.html

I am constructing Filtered_extended_homogeneous points, which require a ring
type like CGAL::Gmpz.  Furthermore, the homogeneous point class must do this
conversion, not the number type.  For example,
   -- homogeneous point [1.012  5.098 2] is the same as [1012 5098 2000],

It seems that only the homogenous class could have all three numbers, which
are necessary to make the conversion.

I could code something like this on my own, but I wonder if there are
subtleties to consider about the various number representations.  CGAL is
focused on these concerns, so I'm wishing for a conversion function from
them.






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