/usr/include/trilinos/Teuchos_DefaultComm.hpp is in libtrilinos-dev 10.4.0.dfsg-1ubuntu2.
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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.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// 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
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
// @HEADER
#ifndef TEUCHOS_DEFAULT_COMM_HPP
#define TEUCHOS_DEFAULT_COMM_HPP
#include "Teuchos_RCP.hpp"
#include "Teuchos_DefaultSerialComm.hpp"
#ifdef HAVE_MPI
# include "Teuchos_DefaultMpiComm.hpp"
#endif
namespace Teuchos {
/** \brief Returns a default global communicator appropriate for the
* enviroment.
*
* If HAVE_MPI is defined, then an instance of <tt>MpiComm</tt> will be
* created from <tt>MPI_COMM_WORLD</tt>. Otherwise, a <tt>SerialComm</tt>
* is returned.
*/
template<typename Ordinal>
class DefaultComm {
public:
/** \brief Return the default glocal communicator.
*
* Note that this function can not be called until after MPI has been
* initialized if MPI is expected!
*/
static Teuchos::RCP<const Comm<Ordinal> > getComm();
/** \brief Return a serial comm if the input comm in null.
*/
static Teuchos::RCP<const Comm<Ordinal> >
getDefaultSerialComm( const Teuchos::RCP<const Comm<Ordinal> > &comm );
private:
static Teuchos::RCP<const Comm<Ordinal> > comm_;
static Teuchos::RCP<const Comm<Ordinal> > defaultSerialComm_;
};
// ///////////////////////////
// Template Implementations
template<typename Ordinal>
Teuchos::RCP<const Teuchos::Comm<Ordinal> >
DefaultComm<Ordinal>::getComm()
{
if(!comm_.get()) {
#ifdef HAVE_MPI
comm_ = rcp(new MpiComm<Ordinal>(opaqueWrapper((MPI_Comm)MPI_COMM_WORLD)));
#else // HAVE_MPI
comm_ = rcp(new SerialComm<Ordinal>());
#endif // HAVE_MPI
}
return comm_;
}
template<typename Ordinal>
Teuchos::RCP<const Teuchos::Comm<Ordinal> >
DefaultComm<Ordinal>::getDefaultSerialComm(
const Teuchos::RCP<const Comm<Ordinal> > &comm
)
{
if( comm.get() )
return comm;
else
return defaultSerialComm_;
}
template<typename Ordinal>
Teuchos::RCP<const Teuchos::Comm<Ordinal> >
DefaultComm<Ordinal>::comm_ = Teuchos::null;
template<typename Ordinal>
Teuchos::RCP<const Teuchos::Comm<Ordinal> >
DefaultComm<Ordinal>::defaultSerialComm_
= Teuchos::rcp(new Teuchos::SerialComm<Ordinal>());
} // namespace Teuchos
#endif // TEUCHOS_DEFAULT_COMM_HPP
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