[Dune] Example on IteratorRange

[Aleksejs Fomins]

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Dear Dune,

I remember we had a discussion before on using iterator ranges for
iterating over entities of gridview, as written in here

http://www.dune-project.org/doc/doxygen/dune-grid-html/group___g_i_iteration.html#_details

Would somebody be so kind to show me to an example program doing this?

In particular, I do not seem to be able to derive from that
documentation page on how one constructs such an iterator. Or, at
least, my Eclipse is not able to direct me to the method like
Dune::GridView::elements

Thank you,
Aleksejs
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