example/UG_ExMaps/cxx_main.cpp

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00001 //@HEADER
00002 // ************************************************************************
00003 // 
00004 //               Epetra: Linear Algebra Services Package 
00005 //                 Copyright (2001) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ************************************************************************
00027 //@HEADER
00028 
00029 #include <stdio.h>
00030 #include <stdlib.h>
00031 #include "Epetra_config.h"
00032 #ifdef HAVE_MPI
00033 #include "mpi.h"
00034 #include "Epetra_MpiComm.h"
00035 #else
00036 #include "Epetra_SerialComm.h"
00037 #endif
00038 #include "Epetra_Map.h"
00039 #include "Epetra_IntSerialDenseVector.h"
00040 #include "Epetra_Version.h"
00041                                             
00042 // prototype
00043 int main(int argc, char *argv[]) {
00044 #ifdef HAVE_MPI
00045   MPI_Init(&argc,&argv);
00046   Epetra_MpiComm Comm(MPI_COMM_WORLD);
00047 #else
00048   Epetra_SerialComm Comm;
00049 #endif
00050 
00051   if (Comm.MyPID()==0)
00052     cout << Epetra_Version() << endl << endl;
00053 
00054   cout << Comm << endl; // Print out process information
00055   // Get the number of global equations from the command line
00056   if (argc!=2) { 
00057     cout << "Usage: " << argv[0] << " number_of_equations" << endl;
00058     exit(1);
00059    }
00060   int NumGlobalElements = atoi(argv[1]);
00061   // Construct a Map that puts approximately the same number of 
00062   // equations on each processor.
00063   Epetra_Map Map(NumGlobalElements, 0, Comm);
00064   // Get update list and number of local equations from newly created Map.
00065   cout << Map << endl;
00066 #ifdef UG_EX1_MPI
00067   MPI_Finalize() ;
00068 #endif
00069 return 0;
00070 }

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