text: #ifndef ENTT_ENTITY_FWD_HPP
  #define ENTT_ENTITY_FWD_HPP
  
  
  #include "../core/fwd.hpp"
  
  
  namespace entt {
  
  
  /*! @class basic_registry */
  template <typename>
  class basic_registry;
  
  /*! @class basic_view */
  template<typename...>
  class basic_view;
  
  /*! @class basic_runtime_view */
  template<typename>
  class basic_runtime_view;
  
  /*! @class basic_group */
  template<typename...>
  class basic_group;
  
  /*! @class basic_observer */
  template<typename>
  class basic_observer;
  
  /*! @struct basic_actor */
  template <typename>
  struct basic_actor;
  
  /*! @class basic_snapshot */
  template<typename>
  class basic_snapshot;
  
  /*! @class basic_snapshot_loader */
  template<typename>
  class basic_snapshot_loader;
  
  /*! @class basic_continuous_loader */
  template<typename>
  class basic_continuous_loader;
  
  /*! @class entity */
  enum class entity: id_type;
  
  /*! @brief Alias declaration for the most common use case. */
  using registry = basic_registry<entity>;
  
  /*! @brief Alias declaration for the most common use case. */
  using observer = basic_observer<entity>;
  
  /*! @brief Alias declaration for the most common use case. */
  using actor = basic_actor<entity>;
  
  /*! @brief Alias declaration for the most common use case. */
  using snapshot = basic_snapshot<entity>;
  
  /*! @brief Alias declaration for the most common use case. */
  using snapshot_loader = basic_snapshot_loader<entity>;
  
  /*! @brief Alias declaration for the most common use case. */
  using continuous_loader = basic_continuous_loader<entity>;
  
  /**
   * @brief Alias declaration for the most common use case.
   * @tparam Types Types of components iterated by the view.
   */
  template<typename... Types>
  using view = basic_view<entity, Types...>;
  
  /*! @brief Alias declaration for the most common use case. */
  using runtime_view = basic_runtime_view<entity>;
  
  /**
   * @brief Alias declaration for the most common use case.
   * @tparam Types Types of components iterated by the group.
   */
  template<typename... Types>
  using group = basic_group<entity, Types...>;
  
  
  }
  
  
  #endif
  