[Dune] Understanding grid.getRealImplementation() paradigm

[Aleksejs Fomins]

Dear Dune,

I feel very confused about this feature of the Grid Implementation.

Consider a method geometrygrid->indexsets->index(&entity)

which does the following

return Grid::getRealImplementation( entity ).index( hostIndexSet() );

however, GeometryGrid does not have the method getRealImplementation(),
except of the one inherited from GridDefaultImplementation. So where is
the method eventually implemented?

I would also appreciate a link to a book chapter or sth where I could
read about this paradigm.

Thank you,
Aleksejs

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