#include <string>
#include <vector>
#include <iostream>
#include <iomanip>
#include <boost/program_options/options_description.hpp>
#include <boost/program_options/variables_map.hpp>
#include <boost/program_options/parsers.hpp>

namespace boostpo = boost::program_options;

boost::program_options::options_description desc("options");

void usage()
{
  std::cout << "program_options_tester help" << std::endl;
  std::cout << "this program demonstrates the boost program_options library" << std::endl;
  std::cout << desc << std::endl;
}

int main(int argc, char** argv) 
{ 

  desc.add_options()
  ("help",        "display usage")
  ("mint,i",      boostpo::value<int>(),                          "my int ")       // --mint or -i
  ("mdouble",     boostpo::value<double>(),                       "my double")
  ("mstring",     boostpo::value<std::string>(),                  "my string")
  ("mnames,n",    boostpo::value<std::vector<std::string> >(),    "vector of strings")
  ;

  boostpo::variables_map vm;
  try
  {
    boostpo::store(boostpo::parse_command_line(argc, argv, desc), vm);
  }
  catch(boostpo::error& e)
  {
    std::cerr << e.what() << std::endl;
    return 1;
  }

  boostpo::notify(vm);

  if (vm.count("help")) 
  {
    usage();
    return 1;
  }

  std::cout << std::left;

  if (vm.count("mint"))
  {
    std::cout << std::setw(20) << "mint: "     << vm["mint"].as<int>() << std::endl;
  }
  if (vm.count("mdouble"))
  {
    std::cout << std::setw(20) << "mdouble: "  << vm["mdouble"].as<double>() << std::endl;
  }
  if (vm.count("mstring"))
  {
    std::cout << std::setw(20) << "mmstring: " << vm["mstring"].as<std::string>() << std::endl;
  }
  if (vm.count("mnames"))
  {
    std::cout << std::setw(20) << "mnames count: " << vm["mnames"].as< std::vector<std::string> >().size() << std::endl;
    std::cout << std::setw(20) << "mnames: ";

    std::vector<std::string>::const_iterator end = vm["mnames"].as< std::vector<std::string> >().end();

    for (std::vector<std::string>::const_iterator iter = vm["mnames"].as< std::vector<std::string> >().begin(); iter != end; ++iter)
    {
      std::cout << *iter << " ";
    }

    std::cout << std::endl;
  }

  return 0;
}