Teuchos_RawMPITraits.hpp

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// ***********************************************************************
// 
//                    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.
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// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// 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
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
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// ////////////////////////////////////////////////////////////////////////
// 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 MPI_Datatype type() { bool *junk1; T *junk2 = &junk1; return MPI_DATATYPE_NULL; } // Should not compile!
};

#ifndef DOXYGEN_SHOULD_SKIP_THIS


template <> class RawMPITraits<char> {
public:
  static MPI_Datatype type() { return MPI_CHAR; }
};


template <> class RawMPITraits<int> {
public:
  static MPI_Datatype type() { return MPI_INT; }
};


template <> class RawMPITraits<float> {
public:
  static MPI_Datatype type() { return MPI_FLOAT; }
};


template <> class RawMPITraits<double> {
public:
  static MPI_Datatype type() { return MPI_DOUBLE; }
};


template <class T> class RawMPITraits<std::complex<T> > {
public:
  static MPI_Datatype type() { buildType(); return type_; }
private:
  static void buildType() {
    if(type_==MPI_DATATYPE_NULL)
      MPI_Type_contiguous( 2, RawMPITraits<T>::type(), &type_ );
  }
  static MPI_Datatype type_;
};

template <class T> MPI_Datatype RawMPITraits<std::complex<T> >::type_ = MPI_DATATYPE_NULL;

#endif // DOXYGEN_SHOULD_SKIP_THIS

} // namespace Teuchos

#endif // TEUCHOS_RAW_MPI_TRAITS_H

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