This is an example of how to use the Teuchos::CommandLineProcessor class.

#include "Teuchos_CommandLineProcessor.hpp"
#include "Teuchos_Version.hpp"

#ifdef HAVE_MPI
#include "mpi.h"

// Enum for the speed option

int main(int argc, char* argv[])
#ifdef HAVE_MPI
  /* initialize MPI if we are running in parallel */
  MPI_Init(&argc, &argv);
  int procRank = -1;
  MPI_Comm_rank( MPI_COMM_WORLD, &procRank );
  if ( procRank == 0 )
    cout << Teuchos::Teuchos_Version() << endl << endl;
  cout << Teuchos::Teuchos_Version() << endl << endl;

  // Creating an empty command line processor looks like:
  Teuchos::CommandLineProcessor My_CLP;

  /* To set and option, it must be given a name and default value.  Additionally,
     each option can be given a help string.  Although it is not necessary, a help
     string aids a users comprehension of the acceptable command line arguments.
     Some examples of setting command line options are:
  // Set an integer command line option.
  int NumIters = 1550;
  My_CLP.setOption("iterations", &NumIters, "Number of iterations");
  // Set a double-precision command line option.
  double Tolerance = 1e-10;    
  My_CLP.setOption("tolerance", &Tolerance, "Tolerance");
  // Set a string command line option.
  string Solver = "GMRES";
  My_CLP.setOption("solver", &Solver, "Linear solver");
  // Set a boolean command line option.    
  bool Precondition;
       &Precondition,"Preconditioning flag");
  // Set an enumeration command line option
  const int    num_speed_values  = 3;
  const ESpeed speed_opt_values[] = { SPEED_SLOW, SPEED_MEDIUM, SPEED_FAST };
  const char*  speed_opt_names[]  = { "slow",     "medium",     "fast"     };
  ESpeed       Speed = SPEED_MEDIUM;
    "speed", &Speed,
    num_speed_values, speed_opt_values, speed_opt_names,
    "Speed of our solver"

  /* There are also two methods that control the behavior of the
     command line processor.  First, for the command line processor to
     allow an unrecognized a command line option to be ignored (and
     only have a warning printed), use:
  /* Second, by default, if the parser finds a command line option it
     doesn't recognize or finds the --help option, it will throw an
     exception.  If you want prevent a command line processor from
     throwing an exception (which is important in this program since
     we don't have an try/catch around this) when it encounters a
     unrecognized option or help is printed, use:

  /* We now parse the command line where argc and argv are passed to
     the parse method.  Note that since we have turned off exception
     throwing above we had better grab the return argument so that
     we can see what happened and act accordingly.
    parseReturn= My_CLP.parse( argc, argv );
  if( parseReturn == Teuchos::CommandLineProcessor::PARSE_HELP_PRINTED ) {
#ifdef HAVE_MPI
    return 0;
  if( parseReturn != Teuchos::CommandLineProcessor::PARSE_SUCCESSFUL   ) {
#ifdef HAVE_MPI 
    return 1; // Error!
  // Here is where you would use these command line arguments but for this example program
  // we will just print the help message with the new values of the command-line arguments.
#ifdef HAVE_MPI
  if (procRank == 0)
  std::cout << "\nPrinting help message with new values of command-line arguments ...\n\n";

  // Now we will print the option values
#ifdef HAVE_MPI
  if (procRank == 0) {
  std::cout << "\nPrinting user options after parsing ...\n\n";
  std::cout << "NumIters     = " << NumIters << std::endl;
  std::cout << "Tolerance    = " << Tolerance << std::endl;
  std::cout << "Solver       = \"" << Solver << "\"\n";
  std::cout << "Precondition = " << Precondition << std::endl;
  std::cout << "Speed        = " << Speed << std::endl;
#ifdef HAVE_MPI
  /* finalize MPI if we are running in parallel */

  return 0;

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