[Dune] [#773] mesh readers and grid factory

[Dune]

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FS#773 - mesh readers and grid factory
User who did this - Carsten Gräser (Carsten)

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Another option (or an additional feature) would be that each mesh creation object provides an interface to mark (or obtain?) segment indices by some format dependent properties. Then readers for formats that allow to specify boundary ids could provide the associated indices e.g. something like:

BitSetVector<1> marks(grid.numBoundarySegments(), false);
reader.markBoundaryById(marks, someBoundaryId);

On the other hand the factory could provide this for the insertion indices

factory.markBoundaryByInsertionIndex(marks, setLikeContainerOfInsertionIndices)

This would allow to simplify the scary task of handling the boundary segment insertion order for large macro grids by hand. Furthermore this would be flexible and extensible.
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http://www.dune-project.org/flyspray/index.php?do=details&task_id=773#comment1905

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