class complex_item: public mstch::object {
private:
  std::string m_name;
  bool m_current;
  std::string m_url;
public:
  complex_item(const std::string& name, bool current, const std::string& url):
      m_name{name}, m_current{current}, m_url{url}
  {
    register_methods(this, {
      {"name", &complex_item::name}, {"current", &complex_item::current},
      {"url", &complex_item::url},   {"link", &complex_item::link}
    });
  }

  mstch::node current() {
    return m_current;
  }

  mstch::node url() {
    return m_url;
  }

  mstch::node name() {
    return m_name;
  }

  mstch::node link() {
    return !m_current;
  }
};

class complex: public mstch::object {
private:
  std::string m_header;
  mstch::array m_item;
public:
  complex():
      m_header{"Colors"},
      m_item{
        std::make_shared<complex_item>("red", true, "#Red"),
        std::make_shared<complex_item>("green", false, "#Green"),
        std::make_shared<complex_item>("blue", false, "#Blue")
      }
  {
    register_methods(this, {
      {"header", &complex::header}, {"item", &complex::item},
      {"list", &complex::list}, {"empty", &complex::empty}
    });
  }

  mstch::node header() {
    return m_header;
  }

  mstch::node item() {
    return m_item;
  }

  mstch::node list() {
    return m_item.size() != 0;
  }

  mstch::node empty() {
    return m_item.size() == 0;
  }
};

const auto complex_data = std::make_shared<complex>();