[Dune] [#900] Can't use GeometryGrid with the PoolAllocator

[Dune]

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FS#900 - Can't use GeometryGrid with the PoolAllocator
User who did this - Martin Nolte (nolte)

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This is a known issue. I don't know where the trouble comes from. It worked fine with the (removed) SmallObjectAllocator, so I'm quite reluctant to waste time on this issue.

The important error message is as follows:
error: incomplete type ‘const Dune::GeometryGrid<Dune::YaspGrid<2>, Dune::IdenticalCoordFunction<double, 2u>, Dune::PoolAllocator<void, 10ul> >’ used in nested name specifier

This seems like the old chicken-egg problem in dune-grid. All interface facades require the type of the grid to be passed as a template argument. All they do is extracting the Traits class, ctype, dimension and dimensionworld from it. Moreover, it is the only way the implementation can access grid-specific information. Now, this class can only be complete, once all these facades have been successfully instantiated. When writing a grid you sometimes run into the trouble of using something from the grid class that is not yet allowed to be accessed. Finding this spot is a real piece of work, because the compiler output is not helpful at all.

I suggest to fix (i.e., remove) this chicken-egg problem before tackling this bug. This will, of course, mean changing the template argument list for *all* interface facades in dune-grid. The good news about this is that pure users are not affected by such a change.


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