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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

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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