nulll https://blog.hatena.ne.jp/nulll/ nulll https://nulll.hatenadiary.org/ 計算機 Cで高階関数を書くには……関数ポインタかっ！と思い出したのはいいもの書き方をすっかり忘れていて死んだ、という話。SICP の Exercise 1.32 を参照。 (define (accumulate combiner null-value term next a b) (if (> a b) null-value (combiner (term a) (accumulate combiner null-value term next (next a) b)))) ;; 1-10 の総和 (accumulate + 0 (lambda (x) x) (lambda (x) (+ x 1)) … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnulll.hatenadiary.org%2Fentry%2F20060604%2Fp2" title=" - nulll" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2006-06-04 00:00:01 rich https://nulll.hatenadiary.org/entry/20060604/p2 1.0 100%