eigenvector.hh

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#ifndef EIGENVECTOR_HH
#define EIGENVECTOR_HH
 
#ifdef HAVE_EIGEN
 
#include <algorithm>
#include <iostream>
 
#include <dune/common/densevector.hh>
#include <dune/common/ftraits.hh>
 
#include <Eigen/Dense>
 
namespace Dune
{
 
  namespace Fem
  {
    // forward declaration
    template< class K > class EigenVector;
  }
 
  // specialization of DenseMatVecTraits for EigenVector
  template< class K >
  struct DenseMatVecTraits< Fem::EigenVector< K > >
  {
    typedef Fem::EigenVector< K > derived_type;
    typedef Eigen::Matrix< K, Eigen::Dynamic, 1 > container_type;
    typedef K value_type;
    typedef unsigned int size_type;
  };
 
  template< class K >
  struct FieldTraits< Fem::EigenVector< K > >
  {
    typedef typename FieldTraits< K >::field_type field_type;
    typedef typename FieldTraits< K >::real_type real_type;
  };
 
 
  namespace Fem
  {
 
    template< class K >
    class EigenVector : public DenseVector< EigenVector< K > >
    {
      typedef EigenVector< K > ThisType;
      typedef DenseVector< ThisType > BaseType;
 
    public:
      typedef typename BaseType::size_type size_type;
      typedef size_type SizeType;
      typedef typename BaseType::value_type value_type;
      typedef value_type FieldType;
      typedef typename DenseMatVecTraits< ThisType >::container_type container_type;
      typedef container_type DofStorageType;
 
      explicit EigenVector( size_type size = 0 )
      : data_( size )
      {}
 
      EigenVector( size_type size, const value_type& s )
      : data_( size )
      {
        std::fill( data_.begin(), data_.end(), s );
      }
 
      template< class T >
      EigenVector( const DenseVector< T >& v )
      : data_( v.size() )
      {
        std::copy( v.begin(), v.end(), data_.begin() );
      }
 
      EigenVector &operator=( const EigenVector& other )
      {
        data_.resize( other.size() );
        std::copy( other.begin(), other.end(), data_.begin() );
        return *this;
      }
 
      const value_type& operator[]( size_type index ) const
      {
        return data_( index );
      }
 
      value_type& operator[]( size_type index )
      {
        return data_( index );
      }
 
      const DofStorageType& coefficients() const
      {
        return data_;
      }
 
      DofStorageType& coefficients()
      {
        return data_;
      }
 
      const value_type* data() const
      {
        return data_.data();
      }
 
      value_type* data()
      {
        return data_.data();
      }
 
      void reserve( size_type newSize )
      {
        data_.resize( newSize );
      }
 
      void resize( size_type newSize )
      {
        data_.resize( newSize );
      }
 
      void resize( size_type newSize, const value_type& s )
      {
        data_.resize( newSize );
        std::fill( data_.begin(), data_.end(), s );
      }
 
      size_type size() const
      {
        return data_.size();
      }
 
    private:
      DofStorageType data_;
    };
 
    template< class K >
    inline std::istream& operator>>( std::istream& in, EigenVector< K >& v )
    {
      EigenVector< K > w(v);
      for( typename EigenVector< K >::size_type i = 0; i < w.size(); ++i )
        in >> w[ i ];
      if(in)
        v = w;
      return in;
    }
 
  } // namespace Fem
 
} // namespace Dune
 
#endif
 
#endif // #ifndef EIGENVECTOR_HH