[Dune] Index to Entity map

[Andreas Dedner]

Hi.
As pointed out there are good reasons why this does not work in general. 
If you really need it, you could store the EntitySeed in a vector. 
Depending on the grid that could either be
- expensive in memory
- expensive in computational time for while retrieving the element

It would work with all grids and for some (where indexing would make 
sense, i.e., a structured grid), it should be neither too expensive 
w.r.t. memory or computational time.
Andreas

On 24/04/17 11:58, Carsten Gräser wrote:
> Hi Kristof,
>
> Am 24.04.2017 um 12:39 schrieb Kristof Cools:
>> Dear all,
>>
>> I am completely new at Dune and after going through the available docs
>> and tutorials I have the following general question:
>>
>> I understand that the concept of a mapper/indexset is central to
>> dune-grid and allows one to get an index (and corresponding attribute
>> values) given an entity. It there a reason that the inverse concept is
>> not part of the API? in other words, why is the set of entities merely
>> iterable, as opposed to indexable?
> there are several reasons which are nicely explained in our FAQ:
>
>    https://dune-project.org/community/faq/
>
> For recent versions of dune the EntityPointer does not
> exist anymore. Just ignore corresponding statements. The
> rest remains valid.
>
> Best,
> Carsten
>
> _______________________________________________
> Dune mailing list
> Dune at dune-project.org
> http://lists.dune-project.org/mailman/listinfo/dune