Hi, I noticed some issue in the IdSet of dune-cornerpoint grid. It is possible to query the id of elements of any codimension. Unfortunately, due to the implementation two entities of codim_1<3, and codim_2<3 with codim_1!=codim_2 might have the same id. This does not adhere to the DUNE interface and might come as quite a surprise.
Basically, the problem is that entities of codimension c, 0<c<3, are not fully supported by dune-cornerpoint (and therefore neglected in the algorithm to compute the id). Either we correctly compute unique ids for these entities or we at least throw an exception if someone tries to access ids of these entities. Cheers, Markus
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