[Dune] GhostEntity

[Andreas Dedner]

In the documentation of the InterIter we have:

  On ghost elements the iterator only stops on the border of the domain,
  i.e., only on the intersections with entities in the interior region.

I thought that all other properties are the same as for real entities.
Andreas

Christian Engwer wrote:
> Dear all,
> 
> we (in Stuttgart) were wandering what the properties of ghostentities
> are. It is clear that ghostentities may not implement all features of
> a full blown entity. In the grid paper and in the doxygen
> documentation, I could not find a clear definition of the guaranteed
> features of ghostentities.
> 
> We need to agree on a mandatory feature set of ghostentities.
> 
> Cheers Christian
> 
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