subfunction.hh

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#ifndef DUNE_FEM_SUBFUNCTION_HH
#define DUNE_FEM_SUBFUNCTION_HH
 
#include <memory>
#include <vector>
 
#include <dune/fem/space/combinedspace/combineddofstorage.hh>
#include <dune/fem/storage/subvector.hh>
#include <dune/fem/function/vectorfunction/vectorfunction.hh>
 
namespace Dune
{
 
  namespace Fem
  {
 
    template <class DiscreteFunctionImp>
    class SubFunctionStorage
    {
    protected:
      typedef DiscreteFunctionImp DiscreteFunctionType;
      typedef typename DiscreteFunctionType :: DiscreteFunctionSpaceType SpaceType;
      enum { dimRange = SpaceType :: dimRange };
      typedef typename DiscreteFunctionType :: DofStorageType DofStorageType;
    public:
      typedef typename SpaceType :: template ToNewDimRange < 1 > :: Type SubSpaceType;
 
      typedef CombinedSubMapper< typename SubSpaceType :: MapperType , dimRange, PointBased > SubMapperType;
      typedef SubVector< DofStorageType, SubMapperType > SubDofVectorType;
      typedef VectorDiscreteFunction< SubSpaceType, SubDofVectorType > SubDiscreteFunctionType;
 
      explicit SubFunctionStorage( DiscreteFunctionType& discreteFunction ) :
        discreteFunction_( discreteFunction ),
        space_( discreteFunction.space() ),
        // FIXME: this line assumes that the 'subspaces' are constructed with only a grid part
        //        which fails with higher order 'DynamicLagrangeSpace' for example.
        subSpace_( space_.gridPart (), space_.communicationInterface(), space_.communicationDirection() ),
        subVector_( dimRange, nullptr ),
        subDiscreteFunction_( dimRange, nullptr )
      {}
 
       SubFunctionStorage( const SubFunctionStorage& ) = delete;
 
      SubDiscreteFunctionType& subFunction(std::size_t component) const
      {
        assert( component < dimRange );
        if( ! subDiscreteFunction_[ component ] )
        {
          subVector_[ component ] =
            std::make_unique< SubDofVectorType >( discreteFunction_.dofStorage(), SubMapperType( subSpace_.mapper(), component ) );
          subDiscreteFunction_[ component ] =
            std::make_unique< SubDiscreteFunctionType >( discreteFunction_.name()+ "_sub", subSpace_, *( subVector_[ component ] ));
        }
        return *( subDiscreteFunction_[ component ] );
      }
 
    protected:
      DiscreteFunctionType& discreteFunction_;
      const SpaceType& space_;
      SubSpaceType subSpace_;
      mutable std::vector< std::unique_ptr< SubDofVectorType > > subVector_;
      mutable std::vector< std::unique_ptr< SubDiscreteFunctionType > > subDiscreteFunction_;
    };
 
  } // namespace Fem
 
} // namespace Dune
 
#endif // #ifndef DUNE_FEM_SUBFUNCTION_HH