Segmentation fault when parsing double

[pfeatherstone]

 argparse::ArgumentParser args("Demo");
 args.add_argument("--gain").help("Gain").required().default_value(40.0);

try {
        args.parse_args(argc, argv);
    }
    catch (const std::runtime_error& err) {
        std::cerr << err.what() << std::endl;
        std::cerr << args;
        std::exit(1);
    }

auto val = args.get<double>("--gain");
    printf("%f\n", val);

By default, it runs fine and prints 40.000.
If i run with --gain 30.0, I get a segmentation fault

[LAhmos]

same with int

[skrobinson]

Fortunately, this is a simple fix for double, int, and all numeric types. The segfault is because --gain is a std::string wrapped in a std::any and .get<double>("--gain") asks for the string to be cast to a double.

The fix is to use .scan<'g', double>() when adding the Argument. Or use .scan<'i', int>() for an int.

See Converting to Numeric Types for details.

[lingerer]

#225 is related