Teuchos_RawMPITraits.hpp

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// @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

// ////////////////////////////////////////////////////////////////////////
// Teuchos_RawMPITraits.hpp

#ifndef TEUCHOS_RAW_MPI_TRAITS_H
#define TEUCHOS_RAW_MPI_TRAITS_H

#include "Teuchos_ConfigDefs.hpp"

namespace Teuchos {

template <class T> class RawMPITraits {
public:
  static int adjustCount(const int count) { bool *junk1; T *junk2 = &junk1; return 0; } // Should not compile!
  static MPI_Datatype type() { bool *junk1; T *junk2 = &junk1; return MPI_DATATYPE_NULL; } // Should not compile!
  static MPI_Op sumOp() { bool *junk1; T *junk2 = &junk1; return MPI_OP_NULL; } // Should not compile!
  static MPI_Op maxOp() { bool *junk1; T *junk2 = &junk1; return MPI_OP_NULL; } // Should not compile!
  static MPI_Op minOp() { bool *junk1; T *junk2 = &junk1; return MPI_OP_NULL; } // Should not compile!
};

#ifndef DOXYGEN_SHOULD_SKIP_THIS

template <> class RawMPITraits<char> {
public:
  static int adjustCount(const int count) { return count; }
  static MPI_Datatype type() { return MPI_CHAR; }
  static MPI_Op sumOp() { return MPI_SUM; }
  static MPI_Op maxOp() { return MPI_MAX; }
  static MPI_Op minOp() { return MPI_MIN; }
};

template <> class RawMPITraits<int> {
public:
  static int adjustCount(const int count) { return count; }
  static MPI_Datatype type() { return MPI_INT; }
  static MPI_Op sumOp() { return MPI_SUM; }
  static MPI_Op maxOp() { return MPI_MAX; }
  static MPI_Op minOp() { return MPI_MIN; }
};

template <> class RawMPITraits<float> {
public:
  static int adjustCount(const int count) { return count; }
  static MPI_Datatype type() { return MPI_FLOAT; }
  static MPI_Op sumOp() { return MPI_SUM; }
  static MPI_Op maxOp() { return MPI_MAX; }
  static MPI_Op minOp() { return MPI_MIN; }
};

template <> class RawMPITraits<double> {
public:
  static int adjustCount(const int count) { return count; }
  static MPI_Datatype type() { return MPI_DOUBLE; }
  static MPI_Op sumOp() { return MPI_SUM; }
  static MPI_Op maxOp() { return MPI_MAX; }
  static MPI_Op minOp() { return MPI_MIN; }
};

template <class T> class RawMPITraits< std::complex<T> > {
public:
  static int adjustCount(const int count) { return (2*count); }
  static MPI_Datatype type() { return RawMPITraits<T>::type(); }
  static MPI_Op sumOp() { return MPI_SUM; }
};

#endif // DOXYGEN_SHOULD_SKIP_THIS

} // namespace Teuchos

#endif // TEUCHOS_RAW_MPI_TRAITS_H