CGAL users discussion list

[Andreas Fabri <>]

On 09/11/2012 15:09, Philipp Moeller wrote:
> Marc Mörig 
> <>
>  writes:
>
> > Dear CGAL maintainers,
> >
> > for comparison purposes I use the following combination of
> > kernels/traits to compute arrangements of circles:
> >
> > typedef CGAL::Exact_predicates_exact_constructions_kernel Linear_k;
> > typedef Linear_k::FT                                      NT;
> > typedef CGAL::Algebraic_kernel_for_circles_2_2<NT>        Algebraic_k;
> > typedef CGAL::Circular_kernel_2<Linear_k,Algebraic_k>     Circular_k;
> > typedef CGAL::Arr_circular_line_arc_traits_2<Circular_k>  Traits;
> >
> > The compiler warns about returning temporaries by reference in several
> > places, eg
> >
> > /scratch/LIBS/CGAL/CGAL-4.0.2/include/CGAL/Circle_2.h:107:55: warning:
> > returning reference to temporary [enabled by default]
> >
> > In this and other places, there is a Qualified_result_of mechanism
> > which seems to be not working, while in other places there is not. If
> > I modify CGAL code to return by value in all places the compiler warns
> > about I get working code. This may however result in inefficiencies
> > for
> > other use cases.
>
> Which CGAL version are you using? Qualified_result_of has been removed
> in CGAL 4.1.

4.0.2