Ticket #2982: required.cpp

#include <boost/program_options.hpp>
#include <string>
#include <iostream>
#include <fstream>

using namespace boost::program_options;
using namespace std;

int main(int argc, char *argv[])
{
  options_description           opts;
  opts.add_options()
    ("cfgfile,c", value<string>()->required(), "the configfile")
    ("fritz,f", value<string>()->default_value("/other/file"), "the output file")
   ;

   variables_map vm;
   ifstream strm("options.ini");

   try {
       store(parse_command_line(argc, argv, opts), vm);
       if (strm) {
          store(parse_config_file(strm, opts), vm);
       }
       notify(vm);
   }
   catch (required_option& e) {   // new exception type
       cout << "required option: " << e.what() << endl;
       return -1;
   }
   catch (...) {
       cout << "other exception: " << endl;
       return -1;
   }

   cout << "count (cfgfile): " << vm.count("cfgfile") << endl;
   if (vm.count("cfgfile")) {
      cout << "is empty (cfgfile): " << (vm["cfgfile"].empty() ? "true": "false") << endl;
      cout << "value: " << vm["cfgfile"].as< string >() << endl;
   }
   return 0;
}