Teuchos_RawMPITraits.hpp

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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 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