boost::program_options

gistfile1.cpp

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

int main(int argc, char const* argv[])
{
    // add options
    boost::program_options::options_description cmdline("Command line options");
    cmdline.add_options()
        ("help,h", "show help message")
        ("list", "list available cameras")
        ("shutter,s", boost::program_options::value<int>()->default_value(10), "shutter speed");

    boost::program_options::variables_map values;

    try {
        // parse_command_line and store into variables_map
        boost::program_options::store(boost::program_options::parse_command_line(argc, argv, cmdline), values);
        std::cerr << values["shutter"].as<int>() << std::endl;

        const int shutter_speed = values["shutter"].as<int>();

    } catch (std::exception &e) {
        std::cerr << e.what() << std::endl;
    }

    // show full options
    std::cerr << cmdline << std::endl;
    return 0;
}