CGAL users discussion list

[Sebastien Loriot <>]

If you inherit, then the final class is not automatically a 
FaceListGraph model.

See this example for how to get all defined correctly:

https://doc.cgal.org/latest/BGL/Polyhedron_2poly_derivation_8cpp-example.html

Sebastien.

On 7/5/22 13:31, Calvin Lim ( via cgal-discuss 
Mailing List) wrote:
> Hi Sebastien,
>
>           I tried to zoom into where I am facing problems at, this is my 
> simple code.
>
> typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
>
> typedef CGAL::Polyhedron_3<Kernel, CGAL::Polyhedron_items_3> Poly_3;
>
> template<class k, class e>
>
> class Poly_Extend : public CGAL::Polyhedron_3<k, e>
>
> {};
>
> int main(int argc, char* argv[])
>
> {
>
>             Poly_3 p3;
>
>             Poly_Extend<Kernel, CGAL::Polyhedron_items_3> p3e;
>
>             std::ofstream outputfile("1.stl");
>
>             CGAL::IO::write_STL(outputfile, p3);  // this works
>
>             CGAL::IO::write_STL(outputfile, p3e); // this came up with a 
> lot of compilation errors.
>
> }
>
>           In this example, p3 works while p3e just cannot be compiled. 
> Do you have any ideas where are the errors?
>
>           Thanks a lot for your help.
>
> Regards
>
> Calvin
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
>
> *From: *Sebastien Loriot <>
> *Sent: *Tuesday, 5 July 2022 4:47 PM
> *To: * <>
> *Subject: *Re: [cgal-discuss] How to use CGAL::IO::write_STL using a 
> polyhedron class
>
> In your example you use operator<< not write_OFF.
>
> Something like that should work:
>
> std::ofstream outputfile(“poly.stl”);
> CGAL::IO::write_STL(outputfile, polyhedron_class);
>
> Sebastien.
>
>
> On 7/5/22 10:40, Calvin Lim ( via cgal-discuss
> Mailing List) wrote:
>  >                      ofstream outputfile(“poly.off”);
>  >
>  >                        outputfile << polyhedron_class ;
>  >
>  >                        outputfile.close();
>  >
>
> --
> You are currently subscribed to cgal-discuss.
> To unsubscribe or access the archives, go to
> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsympa.inria.fr%2Fsympa%2Finfo%2Fcgal-discuss&amp;data=05%7C01%7C%7Cd9ebe0dc21054681f7f808da5e630380%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637926076614595709%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=gLHjz3ZX4DqoC7C518dNQpKQbCQbmV0Bc7Jpxx8zKdQ%3D&amp;reserved=0 
> <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsympa.inria.fr%2Fsympa%2Finfo%2Fcgal-discuss&amp;data=05%7C01%7C%7Cd9ebe0dc21054681f7f808da5e630380%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637926076614595709%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=gLHjz3ZX4DqoC7C518dNQpKQbCQbmV0Bc7Jpxx8zKdQ%3D&amp;reserved=0>
>
>
> --
> You are currently subscribed to cgal-discuss.
> To unsubscribe or access the archives, go to
> https://sympa.inria.fr/sympa/info/cgal-discuss