Galeri Development
Example of Usage of CreateMap()

File galeri/example/Maps.cpp

```// @HEADER
// ************************************************************************
//
//           Galeri: Finite Element and Matrix Generation Package
//
// 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
//
// 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 Galeri? Contact Marzio Sala (marzio.sala _AT_ gmail.com)
//
// ************************************************************************

#include "Galeri_Maps.h"
#ifdef HAVE_MPI
#include "Epetra_MpiComm.h"
#include "mpi.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Teuchos_ParameterList.hpp"

using namespace Galeri;

int main(int argv, char* argc[])
{
#ifdef HAVE_MPI
MPI_Init(&argv, &argc);
Epetra_MpiComm Comm(MPI_COMM_WORLD);
#else
Epetra_SerialComm Comm;
#endif

bool verbose = (Comm.MyPID() == 0);

// Creates an Epetra_Map corresponding to a 2D Cartesian grid
// on the unit square. For parallel runs, the nodes are divided into
// strips, so that the total number of subdomains is Comm.NumProc() x 1.

// Pointer to the object to be created
Epetra_Map* Map = 0;
// Type of the object
string MapType = "Cartesian2D";
// Container for parameters
Teuchos::ParameterList GaleriList;
GaleriList.set("nx", 2 * Comm.NumProc());
GaleriList.set("ny", 2);
GaleriList.set("mx", Comm.NumProc());
GaleriList.set("my", 1);

try
{
// Creation of the map
Map = CreateMap("Cartesian2D", Comm, GaleriList);

// print out the map
cout << *Map;

// To created object must be free'd using delete
delete Map;
}
catch (Exception& rhs)
{
if (Comm.MyPID() == 0)
{
cerr << "Caught exception: ";
rhs.Print();
}
}

#ifdef HAVE_MPI
MPI_Finalize();
#endif

return(EXIT_SUCCESS);
}
```