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    Log::Fatal << "Caught exception from parsing command line: " << ex.what()
        << std::endl;
  }

  // Now iterate through the filled vmap, and overwrite default values with
  // anything that's found on the command line.
  for (variables_map::iterator i = vmap.begin(); i != vmap.end(); ++i)
  {
    // There is not a possibility of an unknown option, since
    // boost::program_options would have already thrown an exception.  Because
    // some names may be mapped, we have to look through each ParamData object
    // and get its boost name.
    const std::string identifier = boostNameMap[i->first];
    util::ParamData& param = parameters[identifier];
    param.wasPassed = true;
    CLI::GetSingleton().functionMap[param.tname]["SetParam"](param,
        (void*) &vmap[i->first].value(), NULL);
  }

  // Flush the buffer, make sure changes are propagated to vmap.
  notify(vmap);

  // If the user specified any of the default options (--help, --version, or
  // --info), handle those.

  // --version is prioritized over --help.
  if (CLI::HasParam("version"))
  {
    std::cout << CLI::GetSingleton().ProgramName() << ": part of "
        << util::GetVersion() << "." << std::endl;
    exit(0); // Don't do anything else.
  }

  // Default help message.
  if (CLI::HasParam("help"))
  {
    Log::Info.ignoreInput = false;
    PrintHelp();
    exit(0); // The user doesn't want to run the program, he wants help.
  }

  // Info on a specific parameter.
  if (CLI::HasParam("info"))
  {
    Log::Info.ignoreInput = false;
    std::string str = CLI::GetParam<std::string>("info");

    // The info node should always be there, but the user may not have specified
    // anything.
    if (str != "")
    {
      PrintHelp(str);
      exit(0);
    }

    // Otherwise just print the generalized help.
    PrintHelp();
    exit(0);
  }

  // Print whether or not we have debugging symbols.  This won't show anything
  // if we have not compiled in debugging mode.
  Log::Debug << "Compiled with debugging symbols." << std::endl;

  if (CLI::HasParam("verbose"))
  {
    // Give [INFO ] output.
    Log::Info.ignoreInput = false;
  }

  // Now, issue an error if we forgot any required options.
  for (std::map<std::string, util::ParamData>::const_iterator iter =
       parameters.begin(); iter != parameters.end(); ++iter)
  {
    const util::ParamData d = iter->second;
    if (d.required)
    {
      const std::string boostName;
      CLI::GetSingleton().functionMap[d.tname]["MapParameterName"](d, NULL,
          (void*) &boostName);

      if (!vmap.count(boostName))
      {
        Log::Fatal << "Required option --" << boostName << " is undefined."
            << std::endl;
      }
    }
  }
}

} // namespace cli
} // namespace bindings
} // namespace mlpack

#endif