example/UG_ExMaps/cxx_main.cpp

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//               Epetra: Linear Algebra Services Package
//                 Copyright 2011 Sandia Corporation
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#include <stdio.h>
#include <stdlib.h>
#include "Epetra_config.h"
#ifdef HAVE_MPI
#include "mpi.h"
#include "Epetra_MpiComm.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Epetra_Map.h"
#include "Epetra_IntSerialDenseVector.h"
#include "Epetra_Version.h"

// prototype
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.MyPID()==0)
    std::cout << Epetra_Version() << std::endl << std::endl;

  std::cout << Comm << std::endl; // Print out process information
  // Get the number of global equations from the command line
  if (argc!=2) {
    std::cout << "Usage: " << argv[0] << " number_of_equations" << std::endl;
    exit(1);
   }
  int NumGlobalElements = atoi(argv[1]);
  // Construct a Map that puts approximately the same number of
  // equations on each processor.
  Epetra_Map Map(NumGlobalElements, 0, Comm);
  // Get update list and number of local equations from newly created Map.
  std::cout << Map << std::endl;
#ifdef UG_EX1_MPI
  MPI_Finalize() ;
#endif
return 0;
}