Teuchos_MPIReductionOpBase.hpp

// @HEADER
// ***********************************************************************
// 
//                    Teuchos: Common Tools Package
//                 Copyright (2004) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//  
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
// 
// ***********************************************************************
// @HEADER

#ifndef _TEUCHOS_MPI_REDUCTION_OP_BASE_HPP_
#define _TEUCHOS_MPI_REDUCTION_OP_BASE_HPP_

#include "Teuchos_RefCountPtr.hpp"

#ifdef HAVE_MPI

#include "mpi.h"

extern "C" {

void Teuchos_MPI_reduction_op(
  void              *invec
  ,void             *inoutvec
  ,int              *len
  ,MPI_Datatype    *datatype
  );

} // extern "C"

namespace Teuchos {

class MPIReductionOpBase {
public:
  virtual ~MPIReductionOpBase() {}
  virtual void reduce(
    void              *invec
    ,void             *inoutvec
    ,int              *len
    ,MPI_Datatype     *datatype
    ) const = 0;
};

void set_reduct_op( const RefCountPtr<const MPIReductionOpBase>& reduct_op );

RefCountPtr<const MPIReductionOpBase> get_reduct_op();

class MPIReductionOpCreator {
public:
  MPIReductionOpCreator( const Teuchos::RefCountPtr<const MPIReductionOpBase>& reduct_op );
  ~MPIReductionOpCreator();
  const MPI_Op& mpi_op() const;
private:
  MPI_Op mpi_op_;
  MPIReductionOpCreator(); // Not defined and not to be called!
};

// /////////////////////////
// Inline defintions

inline
const MPI_Op& MPIReductionOpCreator::mpi_op() const
{
  return mpi_op_;
}

} // namespace Teuchos

#endif // HAVE_MPI

#endif // _TEUCHOS_MPI_REDUCTION_OP_BASE_HPP_

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