[boost] [program_options] simple question

So far I see examples where the result of using program_options parsers is to store something into a variable map. Is it possible to directly store results into variables? For example, assume: int main (int argc, char** argv) { double value = 10.; mythical_parser (...); }; How do I use program_options to set "value"? Any examples? So far the only way I know is: po::options_description desc("Allowed options"); desc.add_options() ("help", "produce help message") ("value", po::value<int>()) ; po::variables_map vm; po::store(po::parse_command_line(argc, argv, desc), vm); po::notify(vm); if (vm.count("value")) value = vm["value"].as<int>();