(defstruct name-and-options &rest slot-descriptions) | Function: DEFSTRUCT {Name | (Name Option*)} {Slot | (Slot [Default] {Key Value}*)} Define the structure type Name. Instances are created by MAKE-<name>, which takes &KEY arguments allowing initial slot values to the specified. A SETF'able function <name>-<slot> is defined for each slot to read and write slot values. <name>-p is a type predicate. Popular DEFSTRUCT options (see manual for others): (:CONSTRUCTOR Name) (:PREDICATE Name) Specify the name for the constructor or predicate. (:CONSTRUCTOR Name Lambda-List) Specify the name and arguments for a BOA constructor (which is more efficient when keyword syntax isn't necessary.) (:INCLUDE Supertype Slot-Spec*) Make this type a subtype of the structure type Supertype. The optional Slot-Specs override inherited slot options. Slot options: :TYPE Type-Spec Asserts that the value of this slot is always of the specified type. :READ-ONLY {T | NIL} If true, no setter function is defined for this slot.
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