Does boost::program_options support requiring one of a series of alternatives?

I'm using the boost::program_options to specify the arguments to my C++ application. Is there a way to specify that one argument is required from a set of alternatives? ``` <application> [--one int-value1 | --two string-value2 | --three] ``` In the above, the user must pass exactly one of the alternatives: `--one`, `--two`, or `--three`. I could do this manually, but hope there is a built-in mechanism instead of this: ``` #include <boost/program_options.hpp> namespace po = boost::program_options; int main(int argc, char *argv[]) { po::options_description options; int band; std::string titles_path; options.add_options() ("one", po::value<int>(&band)->default_value(1)) ("two", po::value<std::string>(&titles_path)) ("three"); po::variables_map vm; po::store(po::parse_command_line(argc, argv, options), vm); if (1 != (vm.count("one") + vm.count("two") + vm.count("three"))) { std::cerr << options << std::endl; return -11; } return 0; } ``` Is there a better way to do this with boost options?