CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

The type-equality wrapper (making Kernel::Point_2 and Point_2<Kernel> 
identical, C_Point_2 in your case) only exposes constructors of
Point_2<Kernel>.

We are currently thinking about a solution to blindly (but type-safely)
forward constructors.

In your case, C_Kernel::Point_2 (which is CGAL::Point_2<C_Kernel>)
inherits from C_Point2. You can do something like this for example:

Point p(C_Point2(1.0f,2.0f,3,2));

In passing x() const should return a const reference otherwise
const cartesian iterator is using a reference to a temporary
(same for y() const)

Sebastien.

Yue Biek wrote:
> Hi,
>        When I study the  Extensible Kernel,I meet a problem,which 
> described as follows:
> I wish to create a C_Kernel for my C_Point2 class(all in 
> the attachment), and I create a constructor initializer 
> for the C_point2 class which takes four parameters.the pronlem turns out 
> as i wish to initialize the point. 
> part of the code in the *C_Kernel* is:
>
>      *     typedef   C_Point2  Point_2*
> ***
> *      in *main()* I just call the constructor initializer 
> *
> *
> *         Point p(1.0f,2.0f,3,2)*
>
> then it turns out to wrong,complier says that the class has 
> no constructor initializer that takes 4  parameters.
> And i found the Point_2 is not the point which I defined in the C_Point2 
> ,But when i changed the code as  
>
> *        typedef C_Point2      Point*.
>
> Then the program go right. I wish to know why? May be my depict are not 
> clear,a example has been attached
>  in the  attachment and my complier is VS2008 in Win7. 
>               
>                                                                          
>                                                                     
> Thank you!