Class: PERSISTENT-SLOT-MIXIN

Slots

• PERSISTENCE

  T for persistent slots, NIL for transient slots. Default value is T.

• INDEX

  An index spec designator for indexed slots, NIL for non-indexed slots. Default value is NIL.

• UNIQUE

  Only relevant for indexed slots. Can be either NIL (slot values are not unique), T (slot values are unique, and an error will be signaled for attempts to add a duplicate slot value) or :NO-ERROR (slot values are unique, but no error will be signaled for attempts to add a duplicate slot value). :NO-ERROR should only be used when speed is critical. The default value is NIL.

Hierachy

Precedence List

• STANDARD-OBJECT

Sub Classes

• PERSISTENT-EFFECTIVE-SLOT-DEFINITION
• PERSISTENT-DIRECT-SLOT-DEFINITION

Source

(defclass persistent-slot-mixin ()
  ((persistence :initarg :persistence
                :initform t
                :reader slot-persistence
                :documentation "T for persistent slots, NIL for
transient slots.  Default value is T.")
   (index :initarg :index
          :initform nil
          :reader slot-index
          :documentation "An index spec designator for indexed slots,
NIL for non-indexed slots.  Default value is NIL.")
   (unique :initarg :unique
           :initform nil
           :reader slot-unique
           :documentation "Only relevant for indexed slots.  Can be
either NIL (slot values are not unique), T (slot values are unique,
and an error will be signaled for attempts to add a duplicate slot
value) or :NO-ERROR (slot values are unique, but no error will be
signaled for attempts to add a duplicate slot value).  :NO-ERROR
should only be used when speed is critical.
  The default value is NIL.")))