CGAL users discussion list

[Andreas Fabri <>]

Hi,

Maybe it helps to switch from mileStones to the metric system, as CGAL is a
rather European project.

Alternatively, it might help, to write "const Alg_point_2& first",
but this is a wild guess looking at the error message.

A happy new year,

andreas



 wrote:
> Hi,
> I write a simple function that takes three Alg_point_2 arguments:
> bool isShorter( Alg_point_2& first, Alg_point_2& second, Alg_point_2& goal )
> {
>         double x1 = CGAL::to_double (first.x());
>         double x2 = CGAL::to_double (second.x());
>         double y1 = CGAL::to_double (first.y());
>         double y2 = CGAL::to_double (second.y());
>         double xg = CGAL::to_double (goal.x());
>         double yg = CGAL::to_double (goal.y());
>         double d1 = ::sqrt (CGAL::to_double (CGAL::square (x1 - xg) + 
> CGAL::square (y1 - yg)));
>         double d2 = ::sqrt (CGAL::to_double (CGAL::square (x2 - xg) + 
> CGAL::square (y2 - yg)));
>         if ( d1 <= d2 )
>                 return true;
>         else
>                 return false;
> }
>
> and I call it somewhere in my code:
> isShorter(mileStones[cnti], nextHop, goal);
>
> the compilation error is:
> error C2662: 'CGAL::VVc_diagram_2<Traits_,AppKernel_>::isShorter' : cannot convert 'this' 
> pointer from 'const CGAL::VVc_diagram_2<Traits_,AppKernel_>' to 
> 'CGAL::VVc_diagram_2<Traits_,AppKernel_> &'
>         with
>         [
>             Traits_=Traits_2,
>             AppKernel_=App_kernel
>         ]
>         and
>         [
>             Traits_=Traits_2,
>             AppKernel_=App_kernel
>         ]
>         and
>         [
>             Traits_=Traits_2,
>             AppKernel_=App_kernel
>         ]
>         Conversion loses qualifiers
>
> What is the problem?
> Thanks,