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(defpackage #:mulk.protocols-examples
(:nicknames #:protocols-examples)
(:use #:cl #:protocols))
(in-package #:mulk.protocols-examples)
(define-protocol printable ()
((print-object * stream)))
(define-protocol serialisable ()
((serialise * stream)))
(define-protocol additive ()
((add * *)
(negate *)))
(define-protocol multiplicative ()
((multiply * *)
(invert *)))
(define-protocol field (additive multiplicative) ())
(define-protocol serialisable-field (serialisable field) ())
(defgeneric serialise (x stream))
(defgeneric add (x y))
(defgeneric negate (x))
(defgeneric multiply (x stream))
(defgeneric invert (x))
(defclass a () ())
;; Note the style warnings signalled by the following.
(implement-protocols a (additive multiplicative serialisable)
(defmethod add ((x a) (y a)))
(defmethod negate ((x a)))
(defmethod multiply ((x a) y)))
(print (conforms-to-p 'a 'additive))
(print (really-conforms-to-p 'a 'additive))
(print (conforms-to-p 'a 'multiplicative))
(print (really-conforms-to-p 'a 'multiplicative))
(print (conforms-to-p 'a 'printable))
(print (really-conforms-to-p 'a 'printable))
(implement-protocols a (printable))
(print (conforms-to-p 'a 'printable))
(print (really-conforms-to-p 'a 'printable))
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