[Dune] IntersectionIterator Umbau heute.

[Andreas Dedner]

I suggested using the GridParts which are a combination
of IndexSets and Iterators belonging to these Indexsets.
This solves the problem (I think) of constructing new
IndexSets - or different Iterators for that matter.
We are writting all our numeric Code using the GridParts, i.e.
are DiscreteFunctions are initialized with a GridPart.
We are planing to extend the interface we are using so far
by methods ibegin(const Entity&) and iend(const Entity&) or
something like that...


Christian Engwer wrote:
> Hallo,
> 
> 
>>Damit das Ganze generisch verwendbar bleibt, schlage ich folgendes vor:
>>
>>wir fügen noch eine dritte Methode ein, nämlich ibegin, welche mit einem
>>template Parameter versehen wird, sowas wie level und leaf, um die
>>IntersetctionIteratoren selektieren zu können. Damit hat man dann
>>zumindest die Möglichkeit, Code zu schreiben, welcher zwischen beiden
>>IntersectionIteratoren switchen kann.
>>
>>Meinungen und Vorschläge hierzu?
> 
> 
> Ich think just the one or the other. We should not add several
> interfaces which are doing the same.
> 
> I see the problem, that ileafbegin and ilevelbegin don't really fit to
> the generic usage we achieved with the indexsets. Actually we do have
> a far more general problem. What we have is that we offer different
> views for different subsets of our entities. Some properties in our
> grid are not specific to an entity (which is unique to all views), but
> to a single view. Examples for such properties are the indicies, the
> interators and also the intersections.
> 
> Someone (I think it was Andreas) once proposed to add ibegin/iend to
> the indexsets and keep the generality in that one place. For
> level/leaf this isn't really a problem, because we have the
> intersections anyway, but introducing this method into the indexset
> interface would raise big problems for the creation of alternative
> indexsets.
> 
> I don't have a real conclusion yet, but we should first think about
> the consequences, because we will then have to live with this
> interface for a while.
> 
> Christian
> 
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