CGAL users discussion list

[Mahmood NT <>]

Hi,
>Alternatively, it might help, to write "const Alg_point_2& first",
>but this is a wild guess looking at the error message.
 
it was not a bad guess... but I add "const" at the end of decleration as:

bool isShorter( Alg_point_2& first, Alg_point_2& second, Alg_point_2& goal ) 
const

and the error actually gone! I do not know why, but the problem solved

Mahmood NT


----- Original Message ----
From: Andreas Fabri 
<>
To: 

Sent: Friday, January 4, 2008 12:18:03 AM
Subject: Re: [cgal-discuss] can not call a function taht takes Alg_point_2

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,
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