101 lines
1.9 KiB
Common Lisp
101 lines
1.9 KiB
Common Lisp
(load "../lang/dlambda.lisp")
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(defun counter (initial-count)
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(let ((count initial-count))
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(eval
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(dlambda
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(:inc ()
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(setf count (+ count 1)))
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(:dec ()
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(setf count (- count 1)))
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(:get ()
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count)
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(:set (value)
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(setf count value))))))
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(defun fruit-counter (initial-count)
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(let ((apple-counter (counter initial-count))
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(banana-counter (counter initial-count))
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(coconut-counter (counter initial-count)))
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(eval
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(dlambda
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(:inc-apples ()
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(funcall apple-counter :inc))
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(:dec-apples ()
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(funcall apple-counter :dec))
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(:get-apples ()
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(funcall apple-counter :get))
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(:set-apples (value)
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(funcall apple-counter :set value))
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(:inc-bananas ()
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(funcall banana-counter :inc))
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(:dec-bananas ()
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(funcall banana-counter :dec))
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(:get-bananas ()
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(funcall banana-counter :get))
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(:set-bananas (value)
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(funcall banana-counter :set value))
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(:inc-coconuts ()
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(funcall coconut-counter :inc))
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(:dec-coconuts ()
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(funcall coconut-counter :dec))
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(:get-coconuts ()
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(funcall coconut-counter :get))
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(:set-coconuts (value)
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(funcall coconut-counter :set value))
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(t (&rest arguments)
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(list
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(list 'apples (funcall apple-counter :get))
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(list 'bananas (funcall banana-counter :get))
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(list 'coconuts (funcall coconut-counter :get))))))))
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; Create an instance
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;
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; usage:
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; ~ (my-fruits :set-apples 23)
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; 23
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;
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(let ((instance (fruit-counter 0)))
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(defun my-fruits (&rest args) (apply instance args)))
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; Another way
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;
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; usage:
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; ~ (funcall my-fruits2 :set-apples 23)
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; 23
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;
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(setf my-fruits2 (fruit-counter 10000))
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