Peter M. Groen / CLI11

#include <CLI/CLI.hpp>

enum Level : std::int32_t {
    High,
    Medium,
    Low
};

int main(int argc, char** argv) {
    CLI::App app;

    Level level;
    app.add_set("-l,--level", level, {High, Medium, Low}, "Level settings")
        ->set_type_name("enum/Level in {High=0, Medium=1, Low=2}");

    try {
        app.parse(argc, argv);
    } catch (CLI::Error const& e) {
        app.exit(e);
    }
    return 0;
}