For yaml-cpp: `bool isEqual(YAML::Node const &lhs, YAML::Node const &rhs)`

yaml_deep_compare.hpp

bool isEqual(YAML::Node const &lhs, YAML::Node const &rhs) {
  if (lhs == rhs) {
    return true;
  }

  YAML::NodeType::value lhs_type = lhs.Type();
  if (lhs_type != rhs.Type()) {
    return false;
  }

  if (lhs.size() != rhs.size()) {
    return false;
  }

  switch (lhs_type) {
    case YAML::NodeType::Scalar: {
      std::string const &lhs_as_string = lhs.as<std::string>();
      std::string const &rhs_as_string = rhs.as<std::string>();
      return lhs_as_string == rhs_as_string;
    }

    case YAML::NodeType::Sequence:
      return lhs.size() == rhs.size()
          && std::equal(boost::begin(lhs), boost::end(lhs), boost::begin(rhs), isEqual);

    case YAML::NodeType::Map:
      BOOST_FOREACH(yaml_map_pair const &lhs_element, lhs) {
    std::string key = lhs_element.first.as<std::string>();
    if (!isEqual(lhs_element.second, rhs[key])) {
      return false;
    }
  }
      return true;

    default:
      return false;
  }
}