[Dune] A question about the relationship between iterators and indices in dune-grid

[HelmerAndre.Friis at iris.no]

Dear Dune-community,

please consider the following questions regarding  the relationship 
between iterators and indices in dune-grid.

A) I state the question in 2D (but it obviously applies similarly in 3D). 
Consider an entity with a given codim thus corresponding to either a 
vertex, edge or element. Is it so that the associated iterator.begin() 
always corresponds to (or in other words: points to) the entity with 
index=0, and moreover, will the operation ++iterator always increase the 
corresponding entity's index with 1.

B) If the answer in A) turns at to be negative, i.e. that there is no such 
obvious relationship between indices and iterators in the dune-grid: how 
do you relate a given index to the corresponding entity, or in other 
words, if you know the index of an entity, how do you obtain a pointer to 
this particular entity?

Thanks in advance,
Helmer André Friis







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