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//
// Tpetra: Templated Linear Algebra Services Package
// Copyright (2008) Sandia Corporation
//
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///
/// \file Epetra_TsqrMessenger.hpp
/// \brief Function for wrapping Epetra_Comm in a communicator wrapper
/// that TSQR can use.
///
/// \note (mfh 27 Oct 2010) This file is in Tpetra (rather than
/// Epetra, where it would seem to belong) as a temporary fix.
/// Otherwise, Epetra would need an optional package dependency on
/// Teuchos and Kokkos, which would break third-party code linking
/// to the Epetra library. Third-party code should use FIND_PACKAGE
/// on Trilinos to get the correct list of libraries against which
/// to link, but we make this easy temporary fix now so they have
/// time to fix their build systems later.
///
#ifndef EPETRA_TSQRMESSENGER_HPP
#define EPETRA_TSQRMESSENGER_HPP
#include <Tpetra_ConfigDefs.hpp>
#if defined(HAVE_TPETRA_EPETRA) && defined(HAVE_TPETRA_TSQR)
// Include Epetra's MPI wrappers.
#include <Epetra_Comm.h>
// Include Teuchos' MPI wrappers.
#include <Teuchos_Comm.hpp>
#include <Teuchos_RCP.hpp>
#include <Tsqr_TeuchosMessenger.hpp>
namespace TSQR {
namespace Epetra {
/// \brief Return the Teuchos communicator corresponding to the
/// given Epetra communicator.
///
/// If the input Epetra_Comm is really an Epetra_MpiComm, return a
/// Teuchos-wrapped version of its raw MPI_Comm MPI communicator
/// object. Otherwise, return a Teuchos::SerialComm instance. It
/// should be one of these two things, but if it's not, this
/// function throws std::invalid_argument.
Teuchos::RCP<const Teuchos::Comm<int> >
extractTeuchosComm (const Teuchos::RCP<const Epetra_Comm>& epetraComm);
//! Wrap the given Epetra_Comm in an object that TSQR understands.
template<class Datum>
Teuchos::RCP<TSQR::MessengerBase<Datum> >
makeTsqrMessenger (const Teuchos::RCP<const Epetra_Comm>& pComm)
{
typedef TSQR::MessengerBase<Datum> base_mess_type;
typedef TSQR::TeuchosMessenger<Datum> mess_type;
Teuchos::RCP<mess_type> pMess =
Teuchos::rcp (new mess_type (extractTeuchosComm (pComm)));
return Teuchos::rcp_implicit_cast<base_mess_type> (pMess);
}
} // namespace Epetra
} // namespace TSQR
#endif // defined(HAVE_TPETRA_EPETRA) && defined(HAVE_TPETRA_TSQR)
#endif // EPETRA_TSQRMESSENGER_HPP
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