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Lecture 17

Lecture 17. OO, the notion of inheritance. Stacks in OO style. ( define (make-stack) (let ((top-ptr '())) (define (empty?) (null? top-ptr)) (define (delete!) (if (null? top-ptr) (error . . .) (set! top-ptr (cdr top-ptr))) top-ptr )

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Lecture 17

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CSE 341 Lecture 21

CSE 341 Lecture 21. delayed evaluation; thunks; streams slides created by Marty Stepp http://www.cs.washington.edu/341/. Lazy evaluation. lazy evaluation : delaying a computation until it is needed (or skipping it entirely, if its result is never used)

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(defmacro (delay x) (list 'lambda () x)) (define (force (promise <function>)) (promise))

(defmacro (delay x) (list 'lambda () x)) (define (force (promise <function>)) (promise)) ==> (define p (delay (print "hello"))) ==> (force p) hello. (defclass <stream> ()) (defclass <null-stream> (<stream>)) (defclass <cons-stream> (<stream>) (head-stream :accessor head-stream

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Cons stream - PowerPoint PPT Presentation

Lecture 17

Lecture 17

CSE 341 Lecture 21

(defmacro (delay x) (list 'lambda () x)) (define (force (promise &lt;function&gt;)) (promise))

(defmacro (delay x) (list 'lambda () x)) (define (force (promise <function>)) (promise))