How to cast a GH_structure<GH_Point> to GH_Structure<IGH_Goo>

Replies to This Discussion

Permalink Reply by Hen B3D on February 25, 2014 at 2:01am

Hi,

It's not possible to do that by casting.

GH_Structure<GH_Point> does not derive from GH_Structure<IGH_Goo> they are just instances of the same template class.

You'll have to create a new GH_Structure and do the casting on each one of the inner elements and in your case it's possible only because they DO derive.

Permalink Reply by Manuel Sotomayor Millan on February 25, 2014 at 8:08am

Yes It is right what you say.

But i found a method of the class GH_Structure, it is called DuplicateCast which is meant to do that. The problem is that I somehow don't figure out how to use it, it somehow has a tricky sintax.

Thanks.

Manuel

Permalink Reply by David Rutten on February 25, 2014 at 9:41am

You could use the DuplicateCast method, you'll have to supply a conversion delegate.

private IGH_Goo conversion(GH_Point data)

{

  return data; // easy since GH_Point already implements IGH_Goo.

}

pass in a reference to this method to DuplicateCast and it should work.

--

David Rutten

david@mcneel.com

Permalink Reply by Manuel Sotomayor Millan on February 25, 2014 at 10:22am

Thanks David.

You earned the first beer in the repository.

It is exactly what I wanted, but I am not still familiarized with delegates, but it worked.