[Dune] Entity vs EntityPointer

[Christian Engwer]

Dear all,

I have a proposal for a solution. Basically I added all entity methods
to the entitypointer and forward them some SFINAEs take care that the
additional codim0 methods are only available on codim0 pointers.

The proposed fix in the dune-grid branch
  feature/fix-entityptr-backwardscompatibility

Opinions?! If there are no strong objection, I suggest to
merge/cherry-pick this onto the release branch, as it helps users in
the transition towards 3.0. The changes are really small and shouldn't
effect any other code. The methods are deliberately not marked as
deprecated methods, as they are only part of the deprecated
entitypointer and should should help users in producing code with
minimal deprecation warnings. If the user uses these methods, he is
fully 3.0 ready, once the underlying grid is ported.

On the other hand, the question might arise, which grids are ported
and which not?!...

In the master I'd merge it for a short period, but remove it, together
with the entitypointer, quite soon.


Ciao
Christian


On Thu, Apr 16, 2015 at 11:45:50AM +0200, Christian Engwer wrote:
> Dear all,
> 
> I wanted to get rid of deprecation warning in PDELab and observed and
> replace things like
>   intersectionIterator->outside()->type()
> by
>   intersectionIterator->outside().type()
> 
> Now the problem occures, that for most of the code I have a working
> version without deprecation warnings, but when using ALUgrid, the code
> breaks, as ALUGrid is not updated yet. This is a general issue,
> because it blocks the upgrade path. How shall we proceed? One option
> would be to extend the EntityPointer-wrapper such that we can call all
> methods of the entity by forwarding the call internally. Are there
> alternatives? Or is there an alternative upgrade path?
> 
> Ciao
> Christian
> 
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-- 
Prof. Dr. Christian Engwer 
Institut für Numerische und Angewandte Mathematik
Fachbereich Mathematik und Informatik der Universität Münster
Einsteinstrasse 62
48149 Münster

E-Mail	christian.engwer at uni-muenster.de
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