Required and Optional Arguments Using Boost Library Program Options

Question

I\'m using Boost Program Options Library to parse the command line arguments.

I have the following requirements:

1. Once \"help\" is provided, all the oth

Answer 1

    std::string conn_mngr_id;
    std::string conn_mngr_channel;
    int32_t priority;
    int32_t timeout;

    boost::program_options::options_description p_opts_desc("Program options");
    boost::program_options::variables_map p_opts_vm;

    try {

        p_opts_desc.add_options()
            ("help,h", "produce help message")
            ("id,i", boost::program_options::value(&conn_mngr_id)->required(), "Id used to connect to ConnectionManager")
            ("channel,c", boost::program_options::value(&conn_mngr_channel)->required(), "Channel to attach with ConnectionManager")
            ("priority,p", boost::program_options::value(&priority)->default_value(1), "Channel to attach with ConnectionManager")
            ("timeout,t", boost::program_options::value(&timeout)->default_value(15000), "Channel to attach with ConnectionManager")
        ;

        boost::program_options::store(boost::program_options::parse_command_line(argc, argv, p_opts_desc), p_opts_vm);

        boost::program_options::notify(p_opts_vm);

        if (p_opts_vm.count("help")) {
            std::cout << p_opts_desc << std::endl;
            return 1;
        }

    } catch (const boost::program_options::required_option & e) {
        if (p_opts_vm.count("help")) {
            std::cout << p_opts_desc << std::endl;
            return 1;
        } else {
            throw e;
        }
    }