Xpetra_EpetraMultiVector.hpp

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#ifndef XPETRA_EPETRAMULTIVECTOR_HPP
#define XPETRA_EPETRAMULTIVECTOR_HPP

/* this file is automatically generated - do not edit (see script/epetra.py) */

#ifdef HAVE_XPETRA_KOKKOS_REFACTOR
#include <Kokkos_Core.hpp>
#include <Kokkos_DualView.hpp>
#endif


#include "Xpetra_EpetraConfigDefs.hpp"

#include "Xpetra_MultiVector.hpp"
#include "Xpetra_Vector.hpp"

#include "Xpetra_EpetraMap.hpp"
#include "Xpetra_EpetraExport.hpp"
#include "Xpetra_Utils.hpp"
#include "Xpetra_EpetraUtils.hpp"
#include "Xpetra_EpetraImport.hpp"
#include "Xpetra_Exceptions.hpp"
#include "Epetra_SerialComm.h"

#include <Epetra_MultiVector.h>
#include <Epetra_Vector.h>

namespace Xpetra {

  // TODO: move that elsewhere
  template<class GlobalOrdinal, class Node>
  const Epetra_MultiVector &          toEpetra(const MultiVector<double,int,GlobalOrdinal,Node> &);
  template<class GlobalOrdinal, class Node>
  Epetra_MultiVector &                toEpetra(MultiVector<double, int,GlobalOrdinal,Node> &);
  template<class GlobalOrdinal, class Node>
  RCP<MultiVector<double, int, GlobalOrdinal, Node> > toXpetra(RCP<Epetra_MultiVector> vec);

  // we need this forward declaration
#ifndef DOXYGEN_SHOULD_SKIP_THIS
  template<class GlobalOrdinal, class Node> class EpetraVectorT;
#endif

  template<class EpetraGlobalOrdinal, class Node>
  class EpetraMultiVectorT
    : public virtual MultiVector<double, int, EpetraGlobalOrdinal, Node>
  {
    typedef double Scalar;
    typedef int LocalOrdinal;
    typedef EpetraGlobalOrdinal GlobalOrdinal;

  public:



    EpetraMultiVectorT(const Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > &map, size_t NumVectors, bool zeroOut=true) {
      TEUCHOS_TEST_FOR_EXCEPTION(true, Xpetra::Exceptions::RuntimeError,
        "Xpetra::EpetraMultiVector only available for GO=int or GO=long long with EpetraNode (Serial or OpenMP depending on configuration)");
    }

    EpetraMultiVectorT(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &source, const Teuchos::DataAccess copyOrView=Teuchos::Copy) {
      TEUCHOS_TEST_FOR_EXCEPTION(true, Xpetra::Exceptions::RuntimeError,
        "Xpetra::EpetraMultiVector only available for GO=int or GO=long long with EpetraNode (Serial or OpenMP depending on configuration)");
    }

    EpetraMultiVectorT(const Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > &map, const Teuchos::ArrayView< const Teuchos::ArrayView< const Scalar > > &ArrayOfPtrs, size_t NumVectors) {
      TEUCHOS_TEST_FOR_EXCEPTION(true, Xpetra::Exceptions::RuntimeError,
        "Xpetra::EpetraMultiVector only available for GO=int or GO=long long with EpetraNode (Serial or OpenMP depending on configuration)");
    }

    virtual ~EpetraMultiVectorT() {}




    void replaceGlobalValue(GlobalOrdinal globalRow, size_t vectorIndex, const Scalar &value) {  }

    void sumIntoGlobalValue(GlobalOrdinal globalRow, size_t vectorIndex, const Scalar &value) {  }

    void replaceLocalValue(LocalOrdinal myRow, size_t vectorIndex, const Scalar &value) {  }

    void sumIntoLocalValue(LocalOrdinal myRow, size_t vectorIndex, const Scalar &value) {  }

    void putScalar(const Scalar &value) {  }




    Teuchos::RCP< const Vector< double, int, GlobalOrdinal, Node > > getVector(size_t j) const {
      return Teuchos::null;
    }

    Teuchos::RCP< Vector< double, int, GlobalOrdinal, Node > > getVectorNonConst(size_t j) {
      return Teuchos::null;
    }

    Teuchos::ArrayRCP< const Scalar > getData(size_t j) const {
      return ArrayRCP<const Scalar>();
    }

    Teuchos::ArrayRCP< Scalar > getDataNonConst(size_t j) {
      return ArrayRCP<Scalar>();
    }




    void dot(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const Teuchos::ArrayView< Scalar > &dots) const {  }

    void abs(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A) {  }

    void reciprocal(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A) {  }

    void scale(const Scalar &alpha) {  }

    void scale (Teuchos::ArrayView< const Scalar > alpha) {  }

    void update(const Scalar &alpha, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const Scalar &beta) {  }

    void update(const Scalar &alpha, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const Scalar &beta, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &B, const Scalar &gamma) {  }

    void norm1(const Teuchos::ArrayView< Teuchos::ScalarTraits< Scalar >::magnitudeType > &norms) const {  }

    void norm2(const Teuchos::ArrayView< Teuchos::ScalarTraits< Scalar >::magnitudeType > &norms) const {  }

    void normInf(const Teuchos::ArrayView< Teuchos::ScalarTraits< Scalar >::magnitudeType > &norms) const {  }

    void meanValue(const Teuchos::ArrayView< Scalar > &means) const {  }

    void multiply(Teuchos::ETransp transA, Teuchos::ETransp transB, const Scalar &alpha, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &B, const Scalar &beta) {  }

    void elementWiseMultiply(Scalar scalarAB, const Vector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &B, Scalar scalarThis) {  }




    size_t getNumVectors() const { return 0; }

    size_t getLocalLength() const { return 0; }

    global_size_t getGlobalLength() const { return 0; }

    // \brief Checks to see if the local length, number of vectors and size of Scalar type match
    bool isSameSize(const MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> & vec) const { return false; }




    std::string description() const { return std::string(""); }

    void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel verbLevel=Teuchos::Describable::verbLevel_default) const {  }


    void randomize(bool bUseXpetraImplementation = false) { }

    //{@

    Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > getMap() const { return Teuchos::null; }

    void doImport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &source, const Import< LocalOrdinal, GlobalOrdinal, Node > &importer, CombineMode CM) {  }

    void doExport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &dest, const Import< LocalOrdinal, GlobalOrdinal, Node >& importer, CombineMode CM) {  }

    void doImport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &source, const Export< LocalOrdinal, GlobalOrdinal, Node >& exporter, CombineMode CM) {  }

    void doExport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &dest, const Export< LocalOrdinal, GlobalOrdinal, Node >& exporter, CombineMode CM) {  }

    void replaceMap(const Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > &map) {  }




    EpetraMultiVectorT(const RCP<Epetra_MultiVector> &vec) { //TODO removed const
      TEUCHOS_TEST_FOR_EXCEPTION(true, Xpetra::Exceptions::RuntimeError,
        "Xpetra::EpetraMultiVector only available for GO=int or GO=long long with EpetraNode (Serial or OpenMP depending on configuration)");
    }

    RCP<Epetra_MultiVector> getEpetra_MultiVector() const { return Teuchos::null; }

    void setSeed(unsigned int seed) {  }


  protected:
    virtual void
    assign (const MultiVector<Scalar, LocalOrdinal, GlobalOrdinal, Node>& rhs) {  }

  }; // EpetraMultiVectorT class

  // specialization on GO=int and Node=EpetraNode
#ifndef XPETRA_EPETRA_NO_32BIT_GLOBAL_INDICES
  template<>
  class EpetraMultiVectorT<int, EpetraNode>
    : public virtual MultiVector<double, int, int, EpetraNode>
  {
    typedef double Scalar;
    typedef int LocalOrdinal;
    typedef int GlobalOrdinal;
    typedef EpetraNode Node;

  public:



    EpetraMultiVectorT(const Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > &map, size_t NumVectors, bool zeroOut=true)
      : vec_(Teuchos::rcp(new Epetra_MultiVector(toEpetra<GlobalOrdinal,Node>(map), Teuchos::as<int>(NumVectors), zeroOut))) { }

    EpetraMultiVectorT(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &source, const Teuchos::DataAccess copyOrView=Teuchos::Copy) {
      if (copyOrView == Teuchos::Copy)
        vec_ = Teuchos::rcp(new Epetra_MultiVector(toEpetra<GlobalOrdinal,Node>(source)));
      else {
        int* indices = new int [source.getNumVectors()];
        for (size_t i = 0; i < source.getNumVectors(); i++)
          indices[i] = i;
        vec_ =  Teuchos::rcp(new Epetra_MultiVector(View, toEpetra<GlobalOrdinal,Node>(source), indices, source.getNumVectors()));
        delete [] indices;
      }
    }

    EpetraMultiVectorT(const Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > &map, const Teuchos::ArrayView< const Teuchos::ArrayView< const Scalar > > &ArrayOfPtrs, size_t NumVectors) {
      //TODO: input argument 'NumVectors' is not necessary in both Xpetra and Tpetra interface. Should it be removed?

      const std::string tfecfFuncName("MultiVector(ArrayOfPtrs)");
      TEUCHOS_TEST_FOR_EXCEPTION_CLASS_FUNC(NumVectors < 1 || NumVectors != Teuchos::as<size_t>(ArrayOfPtrs.size()), std::runtime_error,
                                            ": ArrayOfPtrs.size() must be strictly positive and as large as ArrayOfPtrs.");

  #ifdef HAVE_XPETRA_DEBUG
      // This cannot be tested by Epetra itself
      {
        size_t localLength = map->getNodeNumElements();
        for(int j=0; j<ArrayOfPtrs.size(); j++) {
          TEUCHOS_TEST_FOR_EXCEPTION_CLASS_FUNC(Teuchos::as<size_t>(ArrayOfPtrs[j].size()) != localLength, std::runtime_error,
                                                ": ArrayOfPtrs[" << j << "].size() (== " << ArrayOfPtrs[j].size() <<
                                                ") is not equal to getLocalLength() (== " << localLength);

        }
      }
  #endif

      // Convert Teuchos::ArrayView< const Teuchos::ArrayView< const Scalar > > to double**
      Array<const double*> arrayOfRawPtrs(ArrayOfPtrs.size());
      for(int i=0; i<ArrayOfPtrs.size(); i++) {
        arrayOfRawPtrs[i] = ArrayOfPtrs[i].getRawPtr();
      }
      double** rawArrayOfRawPtrs = const_cast<double**>(arrayOfRawPtrs.getRawPtr()); // This const_cast should be fine, because Epetra_DataAccess=Copy.

      vec_ = Teuchos::rcp(new Epetra_MultiVector(Copy, toEpetra<GlobalOrdinal,Node>(map), rawArrayOfRawPtrs, static_cast<int>(NumVectors)));
    }

    virtual ~EpetraMultiVectorT() {}




    void replaceGlobalValue(GlobalOrdinal globalRow, size_t vectorIndex, const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::replaceGlobalValue"); vec_->ReplaceGlobalValue(globalRow, Teuchos::as<int>(vectorIndex), value); }

    void sumIntoGlobalValue(GlobalOrdinal globalRow, size_t vectorIndex, const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::sumIntoGlobalValue"); vec_->SumIntoGlobalValue(globalRow, Teuchos::as<int>(vectorIndex), value); }

    void replaceLocalValue(LocalOrdinal myRow, size_t vectorIndex, const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::replaceLocalValue"); vec_->ReplaceMyValue(myRow, Teuchos::as<int>(vectorIndex), value); }

    void sumIntoLocalValue(LocalOrdinal myRow, size_t vectorIndex, const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::sumIntoLocalValue"); vec_->SumIntoMyValue(myRow, Teuchos::as<int>(vectorIndex), value); }

    void putScalar(const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::putScalar"); vec_->PutScalar(value); }




    Teuchos::RCP< const Vector< double, int, int, EpetraNode > > getVector(size_t j) const;

    Teuchos::RCP< Vector< double, int, int, EpetraNode > > getVectorNonConst(size_t j);

    Teuchos::ArrayRCP< const Scalar > getData(size_t j) const {
      XPETRA_MONITOR("EpetraMultiVectorT::getData");

      double ** arrayOfPointers;

      vec_->ExtractView(&arrayOfPointers);

      double * data = arrayOfPointers[j];
      int localLength = vec_->MyLength();

      return ArrayRCP<double>(data, 0, localLength, false); // no ownership
    }

    Teuchos::ArrayRCP< Scalar > getDataNonConst(size_t j) {
      XPETRA_MONITOR("EpetraMultiVectorT::getDataNonConst");

      double ** arrayOfPointers;

      vec_->ExtractView(&arrayOfPointers);

      double * data = arrayOfPointers[j];
      int localLength = vec_->MyLength();

      return ArrayRCP<double>(data, 0, localLength, false); // no ownership
    }




    void dot(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const Teuchos::ArrayView< Scalar > &dots) const {
      XPETRA_MONITOR("EpetraMultiVectorT::dot");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, A, eA, "This Xpetra::EpetraMultiVectorT method only accept Xpetra::EpetraMultiVectorT as input arguments.");
      vec_->Dot(*eA.getEpetra_MultiVector(), dots.getRawPtr());
    }

    void abs(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A) { XPETRA_MONITOR("EpetraMultiVectorT::abs"); vec_->Abs(toEpetra<GlobalOrdinal,Node>(A)); }

    void reciprocal(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A) { XPETRA_MONITOR("EpetraMultiVectorT::reciprocal"); vec_->Reciprocal(toEpetra<GlobalOrdinal,Node>(A)); }

    void scale(const Scalar &alpha) { XPETRA_MONITOR("EpetraMultiVectorT::scale"); vec_->Scale(alpha); }

    void scale (Teuchos::ArrayView< const Scalar > alpha) {
      XPETRA_MONITOR("EpetraMultiVectorT::scale");
      // Epetra, unlike Tpetra, doesn't implement this version of
      // scale().  Deal with this by scaling one column at a time.
      const size_t numVecs = this->getNumVectors ();
      for (size_t j = 0; j < numVecs; ++j) {
        Epetra_Vector *v = (*vec_)(j);
        v->Scale (alpha[j]);
      }
    }

    void update(const Scalar &alpha, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const Scalar &beta) { XPETRA_MONITOR("EpetraMultiVectorT::update"); vec_->Update(alpha, toEpetra<GlobalOrdinal,Node>(A), beta); }

    void update(const Scalar &alpha, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const Scalar &beta, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &B, const Scalar &gamma) { XPETRA_MONITOR("EpetraMultiVectorT::update"); vec_->Update(alpha, toEpetra<GlobalOrdinal,Node>(A), beta, toEpetra<GlobalOrdinal,Node>(B), gamma); }

    void norm1(const Teuchos::ArrayView< Teuchos::ScalarTraits< Scalar >::magnitudeType > &norms) const { XPETRA_MONITOR("EpetraMultiVectorT::norm1"); vec_->Norm1(norms.getRawPtr()); }

    void norm2(const Teuchos::ArrayView< Teuchos::ScalarTraits< Scalar >::magnitudeType > &norms) const { XPETRA_MONITOR("EpetraMultiVectorT::norm2"); vec_->Norm2(norms.getRawPtr()); }

    void normInf(const Teuchos::ArrayView< Teuchos::ScalarTraits< Scalar >::magnitudeType > &norms) const { XPETRA_MONITOR("EpetraMultiVectorT::normInf"); vec_->NormInf(norms.getRawPtr()); }

    void meanValue(const Teuchos::ArrayView< Scalar > &means) const { XPETRA_MONITOR("EpetraMultiVectorT::meanValue"); vec_->MeanValue(means.getRawPtr()); } //TODO: modify ArrayView size ??

    void multiply(Teuchos::ETransp transA, Teuchos::ETransp transB, const Scalar &alpha, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &B, const Scalar &beta) { XPETRA_MONITOR("EpetraMultiVectorT::multiply"); vec_->Multiply(toEpetra(transA), toEpetra(transB), alpha, toEpetra(A), toEpetra(B), beta); }

    void elementWiseMultiply(Scalar scalarAB, const Vector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &B, Scalar scalarThis) { XPETRA_MONITOR("EpetraMultiVectorT::elementWiseMultiply"); vec_->Multiply(scalarAB, toEpetra<GlobalOrdinal,Node>(A), toEpetra<GlobalOrdinal,Node>(B), scalarThis); }




    size_t getNumVectors() const { XPETRA_MONITOR("EpetraMultiVectorT::getNumVectors"); return vec_->NumVectors(); }

    size_t getLocalLength() const { XPETRA_MONITOR("EpetraMultiVectorT::getLocalLength"); return vec_->MyLength(); }

    global_size_t getGlobalLength() const { XPETRA_MONITOR("EpetraMultiVectorT::getGlobalLength"); return vec_->GlobalLength64(); }

    bool isSameSize(const MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> & vec) const { 
      XPETRA_MONITOR("EpetraMultiVectorT::isSameSize"); 
      auto vv = toEpetra<GlobalOrdinal,Node>(vec); 
      return ( (vec_->MyLength() == vv.MyLength()) && (vec_->NumVectors() == vv.NumVectors()));
    }
                          



    std::string description() const {
      XPETRA_MONITOR("EpetraMultiVectorT::description");
      TEUCHOS_TEST_FOR_EXCEPTION(1, Xpetra::Exceptions::NotImplemented, "TODO");
      TEUCHOS_UNREACHABLE_RETURN("TODO");
    }

    void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel /* verbLevel */=Teuchos::Describable::verbLevel_default) const {
      XPETRA_MONITOR("EpetraMultiVectorT::describe");
      vec_->Print(out);
    }


    void randomize(bool bUseXpetraImplementation = false) {
      XPETRA_MONITOR("EpetraMultiVectorT::randomize");

      if (bUseXpetraImplementation)
        Xpetra::MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node >::Xpetra_randomize();
      else
        vec_->Random();
    }

    //{@

    Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > getMap() const { XPETRA_MONITOR("EpetraMultiVectorT::getMap"); return toXpetra<GlobalOrdinal,Node>(vec_->Map()); }

    void doImport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &source, const Import< LocalOrdinal, GlobalOrdinal, Node > &importer, CombineMode CM) {
      XPETRA_MONITOR("EpetraMultiVectorT::doImport");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, source, tSource, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraMultiVectorT as input arguments.");
      XPETRA_DYNAMIC_CAST(const EpetraImportT<GlobalOrdinal XPETRA_COMMA Node>, importer, tImporter, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraImportT as input arguments.");

      RCP<Epetra_MultiVector> v = tSource.getEpetra_MultiVector();
      int err = this->getEpetra_MultiVector()->Import(*v, *tImporter.getEpetra_Import(), toEpetra(CM));
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra is " << err);
    }

    void doExport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &dest, const Import< LocalOrdinal, GlobalOrdinal, Node >& importer, CombineMode CM) {
      XPETRA_MONITOR("EpetraMultiVectorT::doExport");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, dest, tDest, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraMultiVectorT as input arguments.");
      XPETRA_DYNAMIC_CAST(const EpetraImportT<GlobalOrdinal XPETRA_COMMA Node>, importer, tImporter, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraImportT as input arguments.");

      RCP<Epetra_MultiVector> v = tDest.getEpetra_MultiVector();
      int err = this->getEpetra_MultiVector()->Export(*v, *tImporter.getEpetra_Import(), toEpetra(CM));
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra.");
    }

    void doImport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &source, const Export< LocalOrdinal, GlobalOrdinal, Node >& exporter, CombineMode CM) {
      XPETRA_MONITOR("EpetraMultiVectorT::doImport");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, source, tSource, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraMultiVectorT as input arguments.");
      XPETRA_DYNAMIC_CAST(const EpetraExportT<GlobalOrdinal XPETRA_COMMA Node>, exporter, tExporter, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraImportT as input arguments.");

      RCP<Epetra_MultiVector> v = tSource.getEpetra_MultiVector();
      int err = this->getEpetra_MultiVector()->Import(*v, *tExporter.getEpetra_Export(), toEpetra(CM));
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra.");
    }

    void doExport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &dest, const Export< LocalOrdinal, GlobalOrdinal, Node >& exporter, CombineMode CM) {
      XPETRA_MONITOR("EpetraMultiVectorT::doExport");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, dest, tDest, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraMultiVectorT as input arguments.");
      XPETRA_DYNAMIC_CAST(const EpetraExportT<GlobalOrdinal XPETRA_COMMA Node>, exporter, tExporter, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraImportT as input arguments.");

      RCP<Epetra_MultiVector> v = tDest.getEpetra_MultiVector();
      int err = this->getEpetra_MultiVector()->Export(*v, *tExporter.getEpetra_Export(), toEpetra(CM));
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra.");
    }

    void replaceMap(const Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > &map) {
      XPETRA_MONITOR("EpetraMultiVectorT::replaceMap");
      int err = 0;
      if (!map.is_null()) {
        err = this->getEpetra_MultiVector()->ReplaceMap(toEpetra<GlobalOrdinal,Node>(map));

      } else {
        // Replace map with a dummy map to avoid potential hangs later
        Epetra_SerialComm SComm;
        Epetra_Map NewMap((GlobalOrdinal) vec_->MyLength(), (GlobalOrdinal) vec_->Map().IndexBase64(), SComm);
        err = this->getEpetra_MultiVector()->ReplaceMap(NewMap);
      }
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra.");
    }




    EpetraMultiVectorT(const RCP<Epetra_MultiVector> &vec) : vec_(vec) { } //TODO removed const

    RCP<Epetra_MultiVector> getEpetra_MultiVector() const { return vec_; }

    void setSeed(unsigned int seed) {
      XPETRA_MONITOR("EpetraMultiVectorT::seedrandom");

      Teuchos::ScalarTraits< Scalar >::seedrandom(seed);
      vec_->SetSeed(seed);
    }

#ifdef HAVE_XPETRA_KOKKOS_REFACTOR

    typedef typename Xpetra::MultiVector<Scalar, LocalOrdinal, GlobalOrdinal, Node>::dual_view_type dual_view_type;

    typename dual_view_type::t_host_const_um getHostLocalView (Access::ReadOnlyStruct) const override { return getHostLocalView(Access::ReadWrite);}

    typename dual_view_type::t_dev_const_um getDeviceLocalView(Access::ReadOnlyStruct) const override { return getDeviceLocalView(Access::ReadWrite);}

    typename dual_view_type::t_host_um getHostLocalView (Access::OverwriteAllStruct) const override { return getHostLocalView(Access::ReadWrite);}

    typename dual_view_type::t_dev_um getDeviceLocalView(Access::OverwriteAllStruct) const override { return getDeviceLocalView(Access::ReadWrite);}

    typename dual_view_type::t_host_um getHostLocalView (Access::ReadWriteStruct) const override {
      typedef Kokkos::View< typename dual_view_type::t_host::data_type ,
                    Kokkos::LayoutLeft,
                    typename dual_view_type::t_host::device_type ,
                    Kokkos::MemoryUnmanaged> epetra_view_type;

      // access Epetra multivector data
      double* data = NULL;
      int myLDA;
      vec_->ExtractView(&data, &myLDA);
      int localLength = vec_->MyLength();
      int numVectors  = getNumVectors();

      // create view
      epetra_view_type test = epetra_view_type(data, localLength, numVectors);
      typename dual_view_type::t_host_um ret = subview(test, Kokkos::ALL(), Kokkos::ALL());

      return ret;
    }

    typename dual_view_type::t_dev_um getDeviceLocalView(Access::ReadWriteStruct) const override {
      throw std::runtime_error("Epetra does not support device views! in "+std::string(__FILE__)+":"+std::to_string(__LINE__));
#ifndef __NVCC__ //prevent nvcc warning
      typename dual_view_type::t_dev_um ret;
#endif
      TEUCHOS_UNREACHABLE_RETURN(ret);
    }

#endif


  protected:
    virtual void
    assign (const MultiVector<Scalar, LocalOrdinal, GlobalOrdinal, Node>& rhs) {
      typedef EpetraMultiVectorT this_type;
      const this_type* rhsPtr = dynamic_cast<const this_type*> (&rhs);
      TEUCHOS_TEST_FOR_EXCEPTION(
        rhsPtr == NULL, std::invalid_argument, "Xpetra::MultiVector::operator=: "
        "The left-hand side (LHS) of the assignment has a different type than "
        "the right-hand side (RHS).  The LHS has type Xpetra::EpetraMultiVectorT "
        "(which means it wraps an Epetra_MultiVector), but the RHS has some "
        "other type.  This probably means that the RHS wraps a Tpetra::Multi"
        "Vector.  Xpetra::MultiVector does not currently implement assignment "
        "from a Tpetra object to an Epetra object, though this could be added "
        "with sufficient interest.");

      RCP<const Epetra_MultiVector> rhsImpl = rhsPtr->getEpetra_MultiVector ();
      RCP<Epetra_MultiVector> lhsImpl = this->getEpetra_MultiVector ();

      TEUCHOS_TEST_FOR_EXCEPTION(
        rhsImpl.is_null (), std::logic_error, "Xpetra::MultiVector::operator= "
        "(in Xpetra::EpetraMultiVectorT::assign): *this (the right-hand side of "
        "the assignment) has a null RCP<Epetra_MultiVector> inside.  Please "
        "report this bug to the Xpetra developers.");
      TEUCHOS_TEST_FOR_EXCEPTION(
        lhsImpl.is_null (), std::logic_error, "Xpetra::MultiVector::operator= "
        "(in Xpetra::EpetraMultiVectorT::assign): The left-hand side of the "
        "assignment has a null RCP<Epetra_MultiVector> inside.  Please report "
        "this bug to the Xpetra developers.");

      // Epetra_MultiVector's assignment operator does a deep copy.
      *lhsImpl = *rhsImpl;
    }

  private:
    RCP< Epetra_MultiVector > vec_;

  }; // EpetraMultiVectorT class (specialization on GO=int, NO=EpetraNode
#endif

  // specialization on GO=long long and EpetraNode
#ifndef XPETRA_EPETRA_NO_64BIT_GLOBAL_INDICES
  template<>
  class EpetraMultiVectorT<long long, EpetraNode>
    : public virtual MultiVector<double, int, long long, EpetraNode>
  {
    typedef double Scalar;
    typedef int LocalOrdinal;
    typedef long long GlobalOrdinal;
    typedef EpetraNode Node;

  public:



    EpetraMultiVectorT(const Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > &map, size_t NumVectors, bool zeroOut=true)
      : vec_(Teuchos::rcp(new Epetra_MultiVector(toEpetra<GlobalOrdinal,Node>(map), Teuchos::as<int>(NumVectors), zeroOut))) { }

    EpetraMultiVectorT(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &source)
      : vec_(Teuchos::rcp(new Epetra_MultiVector(toEpetra<GlobalOrdinal,Node>(source)))) { }

    EpetraMultiVectorT(const Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > &map, const Teuchos::ArrayView< const Teuchos::ArrayView< const Scalar > > &ArrayOfPtrs, size_t NumVectors) {
      //TODO: input argument 'NumVectors' is not necessary in both Xpetra and Tpetra interface. Should it be removed?

      const std::string tfecfFuncName("MultiVector(ArrayOfPtrs)");
      TEUCHOS_TEST_FOR_EXCEPTION_CLASS_FUNC(NumVectors < 1 || NumVectors != Teuchos::as<size_t>(ArrayOfPtrs.size()), std::runtime_error,
                                            ": ArrayOfPtrs.size() must be strictly positive and as large as ArrayOfPtrs.");

  #ifdef HAVE_XPETRA_DEBUG
      // This cannot be tested by Epetra itself
      {
        size_t localLength = map->getNodeNumElements();
        for(int j=0; j<ArrayOfPtrs.size(); j++) {
          TEUCHOS_TEST_FOR_EXCEPTION_CLASS_FUNC(Teuchos::as<size_t>(ArrayOfPtrs[j].size()) != localLength, std::runtime_error,
                                                ": ArrayOfPtrs[" << j << "].size() (== " << ArrayOfPtrs[j].size() <<
                                                ") is not equal to getLocalLength() (== " << localLength);

        }
      }
  #endif

      // Convert Teuchos::ArrayView< const Teuchos::ArrayView< const Scalar > > to double**
      Array<const double*> arrayOfRawPtrs(ArrayOfPtrs.size());
      for(int i=0; i<ArrayOfPtrs.size(); i++) {
        arrayOfRawPtrs[i] = ArrayOfPtrs[i].getRawPtr();
      }
      double** rawArrayOfRawPtrs = const_cast<double**>(arrayOfRawPtrs.getRawPtr()); // This const_cast should be fine, because Epetra_DataAccess=Copy.

      vec_ = Teuchos::rcp(new Epetra_MultiVector(Copy, toEpetra<GlobalOrdinal,Node>(map), rawArrayOfRawPtrs, NumVectors));
    }

    virtual ~EpetraMultiVectorT() {}




    void replaceGlobalValue(GlobalOrdinal globalRow, size_t vectorIndex, const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::replaceGlobalValue"); vec_->ReplaceGlobalValue(globalRow, Teuchos::as<int>(vectorIndex), value); }

    void sumIntoGlobalValue(GlobalOrdinal globalRow, size_t vectorIndex, const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::sumIntoGlobalValue"); vec_->SumIntoGlobalValue(globalRow, Teuchos::as<int>(vectorIndex), value); }

    void replaceLocalValue(LocalOrdinal myRow, size_t vectorIndex, const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::replaceLocalValue"); vec_->ReplaceMyValue(myRow, Teuchos::as<int>(vectorIndex), value); }

    void sumIntoLocalValue(LocalOrdinal myRow, size_t vectorIndex, const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::sumIntoLocalValue"); vec_->SumIntoMyValue(myRow, Teuchos::as<int>(vectorIndex), value); }

    void putScalar(const Scalar &value) { XPETRA_MONITOR("EpetraMultiVectorT::putScalar"); vec_->PutScalar(value); }




    Teuchos::RCP< const Vector< double, int, long long, EpetraNode > > getVector(size_t j) const;

    Teuchos::RCP< Vector< double, int, long long, EpetraNode > > getVectorNonConst(size_t j);

    Teuchos::ArrayRCP< const Scalar > getData(size_t j) const {
      XPETRA_MONITOR("EpetraMultiVectorT::getData");

      double ** arrayOfPointers;

      vec_->ExtractView(&arrayOfPointers);

      double * data = arrayOfPointers[j];
      int localLength = vec_->MyLength();

      return ArrayRCP<double>(data, 0, localLength, false); // no ownership
    }

    Teuchos::ArrayRCP< Scalar > getDataNonConst(size_t j) {
      XPETRA_MONITOR("EpetraMultiVectorT::getDataNonConst");

      double ** arrayOfPointers;

      vec_->ExtractView(&arrayOfPointers);

      double * data = arrayOfPointers[j];
      int localLength = vec_->MyLength();

      return ArrayRCP<double>(data, 0, localLength, false); // no ownership
    }




    void dot(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const Teuchos::ArrayView< Scalar > &dots) const {
      XPETRA_MONITOR("EpetraMultiVectorT::dot");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, A, eA, "This Xpetra::EpetraMultiVectorT method only accept Xpetra::EpetraMultiVectorT as input arguments.");
      vec_->Dot(*eA.getEpetra_MultiVector(), dots.getRawPtr());
    }

    void abs(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A) { XPETRA_MONITOR("EpetraMultiVectorT::abs"); vec_->Abs(toEpetra<GlobalOrdinal,Node>(A)); }

    void reciprocal(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A) { XPETRA_MONITOR("EpetraMultiVectorT::reciprocal"); vec_->Reciprocal(toEpetra<GlobalOrdinal,Node>(A)); }

    void scale(const Scalar &alpha) { XPETRA_MONITOR("EpetraMultiVectorT::scale"); vec_->Scale(alpha); }

    void scale (Teuchos::ArrayView< const Scalar > alpha) {
      XPETRA_MONITOR("EpetraMultiVectorT::scale");
      // Epetra, unlike Tpetra, doesn't implement this version of
      // scale().  Deal with this by scaling one column at a time.
      const size_t numVecs = this->getNumVectors ();
      for (size_t j = 0; j < numVecs; ++j) {
        Epetra_Vector *v = (*vec_)(j);
        v->Scale (alpha[j]);
      }
    }

    void update(const Scalar &alpha, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const Scalar &beta) { XPETRA_MONITOR("EpetraMultiVectorT::update"); vec_->Update(alpha, toEpetra<GlobalOrdinal,Node>(A), beta); }

    void update(const Scalar &alpha, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const Scalar &beta, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &B, const Scalar &gamma) { XPETRA_MONITOR("EpetraMultiVectorT::update"); vec_->Update(alpha, toEpetra<GlobalOrdinal,Node>(A), beta, toEpetra<GlobalOrdinal,Node>(B), gamma); }

    void norm1(const Teuchos::ArrayView< Teuchos::ScalarTraits< Scalar >::magnitudeType > &norms) const { XPETRA_MONITOR("EpetraMultiVectorT::norm1"); vec_->Norm1(norms.getRawPtr()); }

    void norm2(const Teuchos::ArrayView< Teuchos::ScalarTraits< Scalar >::magnitudeType > &norms) const { XPETRA_MONITOR("EpetraMultiVectorT::norm2"); vec_->Norm2(norms.getRawPtr()); }

    void normInf(const Teuchos::ArrayView< Teuchos::ScalarTraits< Scalar >::magnitudeType > &norms) const { XPETRA_MONITOR("EpetraMultiVectorT::normInf"); vec_->NormInf(norms.getRawPtr()); }

    void meanValue(const Teuchos::ArrayView< Scalar > &means) const { XPETRA_MONITOR("EpetraMultiVectorT::meanValue"); vec_->MeanValue(means.getRawPtr()); } //TODO: modify ArrayView size ??

    void multiply(Teuchos::ETransp transA, Teuchos::ETransp transB, const Scalar &alpha, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &B, const Scalar &beta) { XPETRA_MONITOR("EpetraMultiVectorT::multiply"); vec_->Multiply(toEpetra(transA), toEpetra(transB), alpha, toEpetra(A), toEpetra(B), beta); }

    void elementWiseMultiply(Scalar scalarAB, const Vector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > &B, Scalar scalarThis) { XPETRA_MONITOR("EpetraMultiVectorT::elementWiseMultiply"); vec_->Multiply(scalarAB, toEpetra<GlobalOrdinal,Node>(A), toEpetra<GlobalOrdinal,Node>(B), scalarThis); }




    size_t getNumVectors() const { XPETRA_MONITOR("EpetraMultiVectorT::getNumVectors"); return vec_->NumVectors(); }

    size_t getLocalLength() const { XPETRA_MONITOR("EpetraMultiVectorT::getLocalLength"); return vec_->MyLength(); }

    global_size_t getGlobalLength() const { XPETRA_MONITOR("EpetraMultiVectorT::getGlobalLength"); return vec_->GlobalLength64(); }

    bool isSameSize(const MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> & vec) const { 
      XPETRA_MONITOR("EpetraMultiVectorT::isSameSize"); 
      auto vv = toEpetra<GlobalOrdinal,Node>(vec); 
      return ( (vec_->MyLength() == vv.MyLength()) && (vec_->NumVectors() == vv.NumVectors()));
    }
         



    std::string description() const {
      XPETRA_MONITOR("EpetraMultiVectorT::description");
      TEUCHOS_TEST_FOR_EXCEPTION(true, Xpetra::Exceptions::NotImplemented, "TODO");
      //return "TODO"; // unreachable
    }

    void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel /* verbLevel */=Teuchos::Describable::verbLevel_default) const {
      XPETRA_MONITOR("EpetraMultiVectorT::describe");
      vec_->Print(out);
    }


    void randomize(bool bUseXpetraImplementation = false) {
      XPETRA_MONITOR("EpetraMultiVectorT::randomize");

      if (bUseXpetraImplementation)
        Xpetra::MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node >::Xpetra_randomize();
      else
        vec_->Random();
    }

    //{@

    Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > getMap() const { XPETRA_MONITOR("EpetraMultiVectorT::getMap"); return toXpetra<GlobalOrdinal,Node>(vec_->Map()); }

    void doImport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &source, const Import< LocalOrdinal, GlobalOrdinal, Node > &importer, CombineMode CM) {
      XPETRA_MONITOR("EpetraMultiVectorT::doImport");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, source, tSource, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraMultiVectorT as input arguments.");
      XPETRA_DYNAMIC_CAST(const EpetraImportT<GlobalOrdinal XPETRA_COMMA Node>, importer, tImporter, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraImportT as input arguments.");

      RCP<Epetra_MultiVector> v = tSource.getEpetra_MultiVector();
      int err = this->getEpetra_MultiVector()->Import(*v, *tImporter.getEpetra_Import(), toEpetra(CM));
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra is " << err);
    }

    void doExport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &dest, const Import< LocalOrdinal, GlobalOrdinal, Node >& importer, CombineMode CM) {
      XPETRA_MONITOR("EpetraMultiVectorT::doExport");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, dest, tDest, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraMultiVectorT as input arguments.");
      XPETRA_DYNAMIC_CAST(const EpetraImportT<GlobalOrdinal XPETRA_COMMA Node>, importer, tImporter, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraImportT as input arguments.");

      RCP<Epetra_MultiVector> v = tDest.getEpetra_MultiVector();
      int err = this->getEpetra_MultiVector()->Export(*v, *tImporter.getEpetra_Import(), toEpetra(CM));
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra.");
    }

    void doImport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &source, const Export< LocalOrdinal, GlobalOrdinal, Node >& exporter, CombineMode CM) {
      XPETRA_MONITOR("EpetraMultiVectorT::doImport");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, source, tSource, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraMultiVectorT as input arguments.");
      XPETRA_DYNAMIC_CAST(const EpetraExportT<GlobalOrdinal XPETRA_COMMA Node>, exporter, tExporter, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraImportT as input arguments.");

      RCP<Epetra_MultiVector> v = tSource.getEpetra_MultiVector();
      int err = this->getEpetra_MultiVector()->Import(*v, *tExporter.getEpetra_Export(), toEpetra(CM));
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra.");
    }

    void doExport(const DistObject<Scalar, LocalOrdinal, GlobalOrdinal, Node> &dest, const Export< LocalOrdinal, GlobalOrdinal, Node >& exporter, CombineMode CM) {
      XPETRA_MONITOR("EpetraMultiVectorT::doExport");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, dest, tDest, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraMultiVectorT as input arguments.");
      XPETRA_DYNAMIC_CAST(const EpetraExportT<GlobalOrdinal XPETRA_COMMA Node>, exporter, tExporter, "Xpetra::EpetraMultiVectorT::doImport only accept Xpetra::EpetraImportT as input arguments.");

      RCP<Epetra_MultiVector> v = tDest.getEpetra_MultiVector();
      int err = this->getEpetra_MultiVector()->Export(*v, *tExporter.getEpetra_Export(), toEpetra(CM));
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra.");
    }

    void replaceMap(const Teuchos::RCP< const Map< LocalOrdinal, GlobalOrdinal, Node > > &map) {
      XPETRA_MONITOR("EpetraMultiVectorT::replaceMap");
      int err = 0;
      if (!map.is_null()) {
        err = this->getEpetra_MultiVector()->ReplaceMap(toEpetra<GlobalOrdinal,Node>(map));

      } else {
        // Replace map with a dummy map to avoid potential hangs later
        Epetra_SerialComm SComm;
        Epetra_Map NewMap((GlobalOrdinal) vec_->MyLength(), (GlobalOrdinal) vec_->Map().IndexBase64(), SComm);
        err = this->getEpetra_MultiVector()->ReplaceMap(NewMap);
      }
      TEUCHOS_TEST_FOR_EXCEPTION(err != 0, std::runtime_error, "Catch error code returned by Epetra.");
    }




    EpetraMultiVectorT(const RCP<Epetra_MultiVector> &vec) : vec_(vec) { } //TODO removed const

    RCP<Epetra_MultiVector> getEpetra_MultiVector() const { return vec_; }

    void setSeed(unsigned int seed) {
      XPETRA_MONITOR("EpetraMultiVectorT::seedrandom");

      Teuchos::ScalarTraits< Scalar >::seedrandom(seed);
      vec_->SetSeed(seed);
    }


  protected:
    virtual void
    assign (const MultiVector<Scalar, LocalOrdinal, GlobalOrdinal, Node>& rhs) {
      typedef EpetraMultiVectorT this_type;
      const this_type* rhsPtr = dynamic_cast<const this_type*> (&rhs);
      TEUCHOS_TEST_FOR_EXCEPTION(
        rhsPtr == NULL, std::invalid_argument, "Xpetra::MultiVector::operator=: "
        "The left-hand side (LHS) of the assignment has a different type than "
        "the right-hand side (RHS).  The LHS has type Xpetra::EpetraMultiVectorT "
        "(which means it wraps an Epetra_MultiVector), but the RHS has some "
        "other type.  This probably means that the RHS wraps a Tpetra::Multi"
        "Vector.  Xpetra::MultiVector does not currently implement assignment "
        "from a Tpetra object to an Epetra object, though this could be added "
        "with sufficient interest.");

      RCP<const Epetra_MultiVector> rhsImpl = rhsPtr->getEpetra_MultiVector ();
      RCP<Epetra_MultiVector> lhsImpl = this->getEpetra_MultiVector ();

      TEUCHOS_TEST_FOR_EXCEPTION(
        rhsImpl.is_null (), std::logic_error, "Xpetra::MultiVector::operator= "
        "(in Xpetra::EpetraMultiVectorT::assign): *this (the right-hand side of "
        "the assignment) has a null RCP<Epetra_MultiVector> inside.  Please "
        "report this bug to the Xpetra developers.");
      TEUCHOS_TEST_FOR_EXCEPTION(
        lhsImpl.is_null (), std::logic_error, "Xpetra::MultiVector::operator= "
        "(in Xpetra::EpetraMultiVectorT::assign): The left-hand side of the "
        "assignment has a null RCP<Epetra_MultiVector> inside.  Please report "
        "this bug to the Xpetra developers.");

      // Epetra_MultiVector's assignment operator does a deep copy.
      *lhsImpl = *rhsImpl;
    }

  private:
    RCP< Epetra_MultiVector > vec_;

  }; // EpetraMultiVectorT class (specialization on GO=long long, NO=EpetraNode
#endif

} // Xpetra namespace

#include "Xpetra_EpetraVector.hpp" // to avoid incomplete type instantiated above in out-of-body functions.

#endif // XPETRA_EPETRAMULTIVECTOR_HPP