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8b5eb68238
They can be close()d explicitly with close-file-descriptor, and will close() on gc, but only explicitly closing the last port on them will close the fileno. Notably needed for network sockets where we open separate input and output ports on the same socket.
49 lines
1 KiB
Scheme
49 lines
1 KiB
Scheme
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(import (chibi) (chibi memoize) (chibi filesystem) (chibi test))
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(test-begin "memoize")
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(define-memoized (fib n)
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(if (<= n 1)
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1
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(+ (fib (- n 1)) (fib (- n 2)))))
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(test 1 (fib 1))
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(test 573147844013817084101 (fib 100))
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(define-memoized (ack m n)
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(cond
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((= m 0) (+ n 1))
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((= n 0) (ack (- m 1) 1))
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(else (ack (- m 1) (ack m (- n 1))))))
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(test 29 (ack 3 2))
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(test 61 (ack 3 3))
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(let ((n 0))
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(let ((f (memoize (lambda (x) (set! n (+ n 1)) (* x x)))))
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(test 0 n)
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(test 9 (f 3))
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(test 1 n)
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(test 9 (f 3))
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(test 1 n)))
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(let ((n 0))
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(let ((f (memoize (lambda (x) (set! n (+ n 1)) (* x x))
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'size-limit: #f)))
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(test 0 n)
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(test 9 (f 3))
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(test 1 n)
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(test 9 (f 3))
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(test 1 n)))
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(letrec ((fib (lambda (n)
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(if (<= n 1)
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1
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(+ (fib (- n 1)) (fib (- n 2)))))))
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(let ((f (memoize-to-file fib 'memo-dir: "/tmp/memo.d/")))
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(test 89 (f 10))
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(test-assert (file-exists? "/tmp/memo.d/10.memo"))
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(test 89 (f 10))))
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(test-end)
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