Tpetra_Details_extractMpiCommFromTeuchos.cpp

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#include "Tpetra_Details_extractMpiCommFromTeuchos.hpp"

#ifdef HAVE_TPETRACORE_MPI

#include "Teuchos_DefaultMpiComm.hpp"
#include "Teuchos_DefaultSerialComm.hpp"
#include <stdexcept>

namespace Tpetra {
namespace Details {

MPI_Comm
extractMpiCommFromTeuchos (const Teuchos::Comm<int>& comm)
{
  using ::Teuchos::MpiComm;
  using ::Teuchos::SerialComm;

  const MpiComm<int>* mpiComm = dynamic_cast<const MpiComm<int>* > (&comm);
  if (mpiComm != NULL) { // It's an MpiComm; extract the MPI_Comm
    MPI_Comm rawComm = * (mpiComm->getRawMpiComm ());
    return rawComm;
  }
  else {
    const SerialComm<int>* serialComm =
      dynamic_cast<const SerialComm<int>* > (&comm);
    if (serialComm != NULL) {
      return MPI_COMM_SELF; // single-process comm including this process
    }
    else {
      throw std::invalid_argument ("Tpetra::Details::extractMpiCommFromTeuchos: "
                                   "Input Teuchos::Comm is "
                                   "neither a Teuchos::MpiComm, "
                                   "nor a Teuchos::SerialComm.  "
                                   "As a result, I don't know "
                                   "how to get the MPI_Comm out of it.");
    }
  }
}

} // namespace Details
} // namespace Tpetra

#endif // HAVE_TPETRACORE_MPI