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//
// Tpetra: Templated Linear Algebra Services Package
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#ifndef TPETRA_DETAILS_EXTRACTMPICOMMFROMTEUCHOS_HPP
#define TPETRA_DETAILS_EXTRACTMPICOMMFROMTEUCHOS_HPP
/// \file Tpetra_Details_extractMpiCommFromTeuchos.hpp
/// \brief Declaration of Tpetra::Details::extractMpiCommFromTeuchos
///
/// \warning This file and its contents are implementation details of
/// Tpetra. Users must not rely on them.
#include "TpetraCore_config.h"
#ifdef HAVE_TPETRACORE_MPI
#include <mpi.h> // MPI_Comm
#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Teuchos {
// forward declaration of Comm
template<class OrdinalType> class Comm;
} // namespace Teuchos
#endif // NOT DOXYGEN_SHOULD_SKIP_THIS
namespace Tpetra {
namespace Details {
/// \brief Get the MPI_Comm out of the given Teuchos::Comm object.
///
/// \param comm [in] Communicator, wrapped in a Teuchos::Comm wrapper.
/// Must be an instance of Teuchos::MpiComm or Teuchos::SerialComm.
///
/// \return The wrapped MPI_Comm (if comm is a Teuchos::MpiComm), or
/// MPI_COMM_SELF (if comm is a Teuchos::SerialComm).
MPI_Comm
extractMpiCommFromTeuchos (const Teuchos::Comm<int>& comm);
} // namespace Details
} // namespace Tpetra
#endif // HAVE_TPETRACORE_MPI
#endif // TPETRA_DETAILS_EXTRACTMPICOMMFROMTEUCHOS_HPP
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