CGAL users discussion list

[Marc Glisse <>]

On Mon, 16 May 2011, Sebastien Loriot (GeometryFactory) wrote:

> The problem you have comes from the fact that x() and y() don't return
> references. Due to the type_equality_wrapper (the mechanism making 
> Kernel::Point_2 and Point_2<kernel> being compatible), a reference to
> a temporary is returned at some point.
>
> You should write:
>         const MP_FT& x() const {return *pos;}
>         const MP_FT& y() const {return *(pos+1);}

Or provide your own Compute_x_2 functor, as having a reference return type 
in the wrapper depends on the Compute_x_2 functor deriving from Has_qrt 
(but indeed returning the type by reference is better).

--
Marc Glisse