Tpetra_DefaultPlatform.hpp

// @HEADER
// ***********************************************************************
// 
//          Tpetra: Templated Linear Algebra Services 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 TPETRA_DEFAULT_PLATFORM_HPP
#define TPETRA_DEFAULT_PLATFORM_HPP

#include "Tpetra_SerialPlatform.hpp"
#ifdef HAVE_MPI
#  include "Tpetra_MpiPlatform.hpp"
#endif

namespace Tpetra {

template<typename Ordinal>
class DefaultPlatform {
public:

  static Teuchos::RCP<const Platform<Ordinal> > getPlatform();

private:

  static Teuchos::RCP<const Platform<Ordinal> > platform_;

};

// ///////////////////////////
// Template Implementations

template<typename Ordinal>
Teuchos::RCP<const Platform<Ordinal> >
DefaultPlatform<Ordinal>::getPlatform()
{
  if(!platform_.get()) {
#ifdef HAVE_MPI
    platform_ = Teuchos::rcp(new MpiPlatform<Ordinal>(Teuchos::opaqueWrapper<MPI_Comm>(MPI_COMM_WORLD)));
#else // HAVE_MPI    
    platform_ = Teuchos::rcp(new SerialPlatform<Ordinal>());
#endif // HAVE_MPI    
  }
  return platform_;
}

template<typename Ordinal>
Teuchos::RCP<const Platform<Ordinal> >
DefaultPlatform<Ordinal>::platform_ = Teuchos::null;

} // namespace Tpetra

#endif // TPETRA_DEFAULT_PLATFORM_HPP

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