Method get_attr

include/chaiscript/dispatchkit/boxed_value.hpp:321–336

      }

      Boxed_Value get_attr(const std::string &t_name)
      {
        if (!m_data->m_attrs)
        {
          m_data->m_attrs = std::make_unique<std::map<std::string, std::shared_ptr<Data>>>();
        }

        auto &attr = (*m_data->m_attrs)[t_name];
        if (attr) {
          return Boxed_Value(attr, Internal_Construction());
        } else {
          Boxed_Value bv; //default construct a new one
          attr = bv.m_data;
          return bv;
        }
      }

      Boxed_Value &copy_attrs(const Boxed_Value &t_obj)
      {