preconditionedinverseoperator.hh

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#ifndef DUNE_FEM_SOLVER_PRECONDITIONEDINVERSEOPERATOR_HH
#define DUNE_FEM_SOLVER_PRECONDITIONEDINVERSEOPERATOR_HH
 
#include <limits>
#include <memory>
 
#include <dune/fem/operator/common/operator.hh>
 
namespace Dune
{
 
  namespace Fem
  {
 
    // PreconditionedInverseOperator
    // -----------------------------
 
    template< class Preconditioner, class InverseOperator >
    class PreconditionedInverseOperator
    : public Operator< typename Preconditioner::RangeFunctionType >
    {
      typedef PreconditionedInverseOperator< Preconditioner, InverseOperator > ThisType;
      typedef Operator< typename Preconditioner::RangeFunctionType > BaseType;
 
    public:
      typedef typename BaseType::DomainFunctionType DomainFunctionType;
      typedef typename BaseType::DomainFunctionType RangeFunctionType;
 
      typedef typename InverseOperator::OperatorType OperatorType;
 
      PreconditionedInverseOperator ( double redEps, double absLimit, unsigned int maxIterations, bool verbose )
      : inverseOperator_( redEps, absLimit, maxIterations, verbose )
      {}
 
      PreconditionedInverseOperator ( double redEps, double absLimit,
                                      unsigned int maxIterations = std::numeric_limits< unsigned int >::max() )
      : inverseOperator_( redEps, absLimit, maxIterations )
      {}
 
      PreconditionedInverseOperator ( const OperatorType &op, double redEps, double absLimit,
                                      unsigned int maxIterations, bool verbose )
      : inverseOperator_( redEps, absLimit, maxIterations, verbose )
      {
        bind( op );
      }
 
      PreconditionedInverseOperator ( const OperatorType &op, double redEps, double absLimit,
                                      unsigned int maxIterations = std::numeric_limits< unsigned int >::max() )
      : inverseOperator_( redEps, absLimit, maxIterations )
      {
        bind( op );
      }
 
      void bind ( const OperatorType &op )
      {
        preconditioner_.reset( new Preconditioner( op ) );
        asssert( preconditioner_ );
        inverseOperator_.bind( op, *preconditioner_ );
      }
      void unbind() { inverseOperator_.unbind(); preconditioner_.reset(); }
 
      void operator() ( const DomainFunctionType &u, RangeFunctionType &w ) const
      {
        assert( preconditioner_ );
        inverseOperator_( u, w );
      }
 
      unsigned int iterations () const { return inverseOperator_.iterations(); }
      void setMaxIterations ( unsigned int maxIterations ) const { inverseOperator_.setMaxIterations( maxIterations ); }
 
    private:
      InverseOperator inverseOperator_;
      std::unique_ptr< Preconditioner > preconditioner_;
    };
 
  } // namespace Fem
 
} // namespace Dune
 
#endif // #ifndef DUNE_FEM_SOLVER_PRECONDITIONEDINVERSEOPERATOR_HH