text: #ifndef OBJECT_INTERFACES_H
  #define OBJECT_INTERFACES_H
  
  #include "qom/object.h"
  
  #define TYPE_USER_CREATABLE "user-creatable"
  
  #define USER_CREATABLE_CLASS(klass) \
       OBJECT_CLASS_CHECK(UserCreatableClass, (klass), \
                          TYPE_USER_CREATABLE)
  #define USER_CREATABLE_GET_CLASS(obj) \
       OBJECT_GET_CLASS(UserCreatableClass, (obj), \
                        TYPE_USER_CREATABLE)
  #define USER_CREATABLE(obj) \
       INTERFACE_CHECK(UserCreatable, (obj), \
                       TYPE_USER_CREATABLE)
  
  
  typedef struct UserCreatable {
      /* <private> */
      Object Parent;
  } UserCreatable;
  
  /**
   * UserCreatableClass:
   * @parent_class: the base class
   * @complete: callback to be called after @obj's properties are set.
   *
   * Interface is designed to work with -object/object-add/object_add
   * commands.
   * Interface is mandatory for objects that are designed to be user
   * creatable (i.e. -object/object-add/object_add, will accept only
   * objects that inherit this interface).
   *
   * Interface also provides an optional ability to do the second
   * stage * initialization of the object after its properties were
   * set.
   *
   * For objects created without using -object/object-add/object_add,
   * @user_creatable_complete() wrapper should be called manually if
   * object's type implements USER_CREATABLE interface and needs
   * complete() callback to be called.
   */
  typedef struct UserCreatableClass {
      /* <private> */
      InterfaceClass parent_class;
  
      /* <public> */
      void (*complete)(UserCreatable *uc, Error **errp);
  } UserCreatableClass;
  
  /**
   * user_creatable_complete:
   * @obj: the object whose complete() method is called if defined
   * @errp: if an error occurs, a pointer to an area to store the error
   *
   * Wrapper to call complete() method if one of types it's inherited
   * from implements USER_CREATABLE interface, otherwise the call does
   * nothing.
   */
  void user_creatable_complete(Object *obj, Error **errp);
  #endif
  