#include int main(int argc, char *argv[]) { argparse::ArgumentParser program("test"); program.add_argument("--color") .default_value(std::string{ "orange"}) // might otherwise be type const char* leading to an error // when trying program.get .help("specify the cat's fur color"); try { program.parse_args(argc, argv); // Example: ./main --color orange } catch (const std::runtime_error &err) { std::cerr << err.what() << std::endl; std::cerr << program; std::exit(1); } auto color = program.get("--color"); // "orange" auto explicit_color = program.is_used("--color"); // true, user provided orange std::cout << "Color: " << color << "\n"; std::cout << "Argument was explicitly provided by user? " << std::boolalpha << explicit_color << "\n"; }