[Dune] [#1049] Return geometries as real objects

[Dune]

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FS#1049 - Return geometries as real objects
User who did this - Martin Nolte (nolte)

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Recently I stumbled over a little problem. SPGrid's local geometries (a very small number) are actually stored on the grid and remain valid forever. Therefore, the real geometry object, i.e., LocalGeometry, should be a reference (or pointer) to the actual implementation.

Currently, the LocalGeometry it is simply a Dune::Geometry with StoreReferences set to true. In order to avoid the deprecation warning, I would now have to implement a GeometryReference, which is a copy of Dune::Geometry storing a reference. This class would then be plugged into Dune::Geometry (i.e., two facade classes).

This leads to 2 questions:
(a) Is a GeometryReference class the desired implementation for what I describe?
(b) Shall I put in in dune-grid or into dune-spgrid?

I would appreciate a decision prior to the 2.2 release.
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More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=1049#comment3502

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