Class Dune::Amg::AMG< M, X, S, PI, A >

drop the smoother template parameter and replace with dynamic construction

Class Dune::ArPackPlusPlus_Algorithms< BCRSMatrix, BlockVector >

The current implementation is limited to DUNE-ISTL BCRSMatrix types with blocklevel 2. An extension to blocklevel >= 2 might be provided in a future version.

Maybe make ARPACK++ parameter ncv available to the user.

Class Dune::BDMatrix< B, A >

It would be safer and more efficient to have a real implementation of a block-diagonal matrix and not just subclassing from BCRSMatrix. But that's quite a lot of work for that little advantage.

Class Dune::BTDMatrix< B, A >

It would be safer and more efficient to have a real implementation of a block-tridiagonal matrix and not just subclassing from BCRSMatrix. But that's quite a lot of work for that little advantage.

Member Dune::makeScalarProduct (std::shared_ptr< const Comm > comm, SolverCategory::Category category)

this helper function should be replaced by a proper factory

Class Dune::PowerIteration_Algorithms< BCRSMatrix, BlockVector >

The current implementation is limited to DUNE-ISTL BCRSMatrix types with blocklevel 2. An extension to blocklevel >= 2 might be provided in a future version.