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// ***********************************************************************
// 
//                      Didasko Tutorial Package
//                 Copyright (2005) 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 about Didasko? Contact Marzio Sala (marzio.sala _AT_ gmail.com)
// 
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// @HEADER

// define a vector of global dimension 5, split among 2 processes p0 and p1
// int the following way:
//  0 -- 1 -- 2 -- 3 -- 4
//  <-p0->    <----p1--->
// This code must be run with two processes

#include "Didasko_ConfigDefs.h"
#if defined(HAVE_DIDASKO_EPETRA)

#include "Epetra_ConfigDefs.h"
#ifdef HAVE_MPI
#include <mpi.h>
#include "Epetra_MpiComm.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Epetra_Map.h"

int main(int argc, char *argv[]) {

#ifdef HAVE_MPI
  MPI_Init(&argc, &argv);
  Epetra_MpiComm Comm(MPI_COMM_WORLD);
#else
  Epetra_SerialComm Comm;
#endif

  if (Comm.NumProc() != 2) {
#ifdef HAVE_MPI
    MPI_Finalize();
#endif
    return(0);
  }
    
  int NumGlobalElements=5;   // global dimension of the problem
  int MyElements = 0;        // local dimension of the problem
  int *MyGlobalElements = 0; // local-to-global map
  int MyPID = Comm.MyPID();  // ID of this process

  if( Comm.NumProc() != 2 ) {
    cerr << "This code must be run with 2 processes\n";
    exit( EXIT_FAILURE );
  }
  
  // hardwired number of local elements and local-to-global map
  switch( MyPID ) {
  case 0:
    MyElements = 2;
    MyGlobalElements = new int[MyElements];
    MyGlobalElements[0] = 0;
    MyGlobalElements[1] = 1;
    break;
  case 1:
    MyElements = 3;
    MyGlobalElements = new int[MyElements];
    MyGlobalElements[0] = 2;
    MyGlobalElements[1] = 3;
    MyGlobalElements[2] = 4;
    break;
  }

  Epetra_Map Map(NumGlobalElements,MyElements,MyGlobalElements,0,Comm);
  
  cout << Map;

  delete MyGlobalElements;
  
#ifdef HAVE_MPI
  MPI_Finalize();
#endif

  return(0);

} /* main */

#else

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
  puts("Please configure Didasko with:\n"
       "--enable-epetra");

  return 0;
}

#endif
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