On Jan 15, 2017, at 3:15 AM, Roberto Bagnara bagnara@cs.unipr.it wrote:
On 01/14/2017 05:18 PM, John Perry wrote:
I'd like to extract the rays of a polyhedron. As far as I can tell from the documentation, the only way to do this is to extract the generators, then loop over them, testing which is a ray:
Generator_System G = P.generators(); for (Generator g : G) if (g.is_ray()) { /* party time */ }
Is there a more direct way to do this, something like G.rays() or even P.rays()?
Hello John,
the snippet above makes lots of unnecessary copies. I would do something like
const Generator_System& G = P.generators(); for (const Generator& g : G) if (g.is_ray()) { /* party time */ }
Oh, right, thank you! I actually had the second, but not the first.
Apart from this, no, there is no more direct way: if it were, it would be implemented along those lines.
I understand. Thank you again.
sincerely regards john perry