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/usr/include/dune/localfunctions/lagrange/p0.hh is in libdune-localfunctions-dev 2.2.1-2.

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// -*- tab-width: 4; indent-tabs-mode: nil -*-
// vi: set ts=4 sw=2 et sts=2:
#ifndef DUNE_P0LOCALFINITEELEMENT_HH
#define DUNE_P0LOCALFINITEELEMENT_HH

#include <dune/geometry/type.hh>

#include <dune/localfunctions/common/localfiniteelementtraits.hh>
#include "p0/p0localbasis.hh"
#include "p0/p0localcoefficients.hh"
#include "p0/p0localinterpolation.hh"

namespace Dune 
{

   /** \todo The local p0 finite element on all types of reference elements
       \tparam D Domain data type
       \tparam R Range data type
       \tparam d Dimension of the reference element
  */
  template<class D, class R, int d>
  class P0LocalFiniteElement 
  {
  public:
    /** \todo Please doc me !
     */
	typedef LocalFiniteElementTraits<P0LocalBasis<D,R,d>, P0LocalCoefficients,
									 P0LocalInterpolation<P0LocalBasis<D,R,d> > > Traits;

    /** \todo Please doc me !
     */
    P0LocalFiniteElement (const GeometryType& type) 
      : interpolation(type), gt(type)
    {}
    
    /** \todo Please doc me !
     */
	P0LocalFiniteElement (GeometryType::BasicType basicType) DUNE_DEPRECATED
	  : interpolation(GeometryType(basicType,d)), gt(basicType,d)
	{}

    /** \todo Please doc me !
     */
	const typename Traits::LocalBasisType& localBasis () const
	{
	  return basis;
	}
	
    /** \todo Please doc me !
     */
	const typename Traits::LocalCoefficientsType& localCoefficients () const
	{
	  return coefficients;
	}
	
    /** \todo Please doc me !
     */
	const typename Traits::LocalInterpolationType& localInterpolation () const
	{
	  return interpolation;
	}
	
    /** \todo Please doc me !
     */
	GeometryType type () const
	{
	  return gt;
	}

    P0LocalFiniteElement* clone () const
    {
      return new P0LocalFiniteElement(*this);
    }

  private:
	P0LocalBasis<D,R,d> basis;
	P0LocalCoefficients coefficients;
	P0LocalInterpolation<P0LocalBasis<D,R,d> > interpolation;
	GeometryType gt;
  };

}

#endif