Tpetra_MixedScalarMultiplyOp.hpp

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// @HEADER
// *****************************************************************************
//          Tpetra: Templated Linear Algebra Services Package
//
// Copyright 2008 NTESS and the Tpetra contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef TPETRA_MIXEDSCALARMULTIPLYOP_HPP
#define TPETRA_MIXEDSCALARMULTIPLYOP_HPP


#include "Tpetra_Operator.hpp"
#include "Tpetra_Util.hpp"
#include "Tpetra_Details_Behavior.hpp"
#include "Tpetra_Details_Profiling.hpp"

namespace Tpetra {

  template <class Scalar,
            class OpScalar,
            class LocalOrdinal,
            class GlobalOrdinal,
            class Node>
  class MixedScalarMultiplyOp :
    public Operator<Scalar, LocalOrdinal, GlobalOrdinal, Node>
  {
  public:
    using op_type =
      Operator<OpScalar, LocalOrdinal, GlobalOrdinal, Node>;
    using map_type = Map<LocalOrdinal, GlobalOrdinal, Node>;

  public:


    MixedScalarMultiplyOp (const Teuchos::RCP<const op_type>& A) :
      op_ (A)
    {
      Allocate(1);
    }

    ~MixedScalarMultiplyOp () override = default;



    void
    apply (const MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X,
           MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y,
           Teuchos::ETransp mode = Teuchos::NO_TRANS,
           Scalar alpha = Teuchos::ScalarTraits<Scalar>::one (),
           Scalar beta = Teuchos::ScalarTraits<Scalar>::zero ()) const override
    {
      TEUCHOS_TEST_FOR_EXCEPTION
        (X.getNumVectors () != Y.getNumVectors (), std::runtime_error,
         Teuchos::typeName (*this) << "::apply(X,Y): X and Y must have the same number of vectors.");

      if (X.getNumVectors() != X_->getNumVectors()) {
        Allocate(X.getNumVectors());
      }

      Tpetra::deep_copy(*X_, X);
      op_->apply (*X_, *Y_, mode, Teuchos::as<OpScalar>(alpha), Teuchos::as<OpScalar>(beta));
      Tpetra::deep_copy(Y, *Y_);
    }

    bool hasTransposeApply() const override {
      return true;
    }

    Teuchos::RCP<const map_type> getDomainMap () const override {
      return op_->getDomainMap ();
    }

    Teuchos::RCP<const map_type> getRangeMap () const override {
      return op_->getRangeMap ();
    }


  protected:
    typedef MultiVector<OpScalar,LocalOrdinal,GlobalOrdinal,Node> MV;

    const Teuchos::RCP<const op_type> op_;
    mutable Teuchos::RCP<MV> X_, Y_;

    void
    Allocate(int numVecs) const {
      X_ = rcp(new MV(op_->getDomainMap(),numVecs));
      Y_ = rcp(new MV(op_->getRangeMap(),numVecs));
    }

  };

  template <class Scalar,
            class OpScalar,
            class LocalOrdinal,
            class GlobalOrdinal,
            class Node>
  Teuchos::RCP<
    MixedScalarMultiplyOp<Scalar, OpScalar, LocalOrdinal, GlobalOrdinal, Node> >
  createMixedScalarMultiplyOp (const Teuchos::RCP<
    const Operator<OpScalar, LocalOrdinal, GlobalOrdinal, Node> >& A)
  {
    typedef MixedScalarMultiplyOp<Scalar, OpScalar, LocalOrdinal,
      GlobalOrdinal, Node> op_type;
    return Teuchos::rcp (new op_type (A));
  }

} // end of namespace Tpetra

#endif // TPETRA_MIXEDSCALARMULTIPLYOP_HPP