Function to_flag_value

simcore/framework/src/cli/cli.hpp:1406–1446

Convert a flag into an integer value typically binary flags

/// Convert a flag into an integer value  typically binary flags
inline std::int64_t to_flag_value(std::string val) {
  static const std::string trueString("true");
  static const std::string falseString("false");
  if (val == trueString) {
    return 1;
  }
  if (val == falseString) {
    return -1;
  }
  val = detail::to_lower(val);
  std::int64_t ret;
  if (val.size() == 1) {
    if (val[0] >= '1' && val[0] <= '9') {
      return (static_cast<std::int64_t>(val[0]) - '0');
    }
    switch (val[0]) {
      case '0':
      case 'f':
      case 'n':
      case '-':
        ret = -1;
        break;
      case 't':
      case 'y':
      case '+':
        ret = 1;
        break;
      default:
        throw std::invalid_argument("unrecognized character");
    }
    return ret;
  }
  if (val == trueString || val == "on" || val == "yes" || val == "enable") {
    ret = 1;
  } else if (val == falseString || val == "off" || val == "no" || val == "disable") {
    ret = -1;
  } else {
    ret = std::stoll(val);
  }
  return ret;
}

/// Signed integers
template <typename T,