Macro: COMMON-LISP:DEFSTRUCT

DEFSTRUCT {Name | (Name Option)} [Documentation] {Slot | (Slot [Default] {Key Value})} Define the structure type Name. Instances are created by MAKE-, which takes &KEY arguments allowing initial slot values to the specified. A SETF’able function - is defined for each slot to read and write slot values. -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.

Lambda list

(sb-kernel::name-and-options &rest sb-kernel::slot-descriptions)