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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.
24 lines
852 B
Scheme
24 lines
852 B
Scheme
;; deletion.scm -- list deletion utilities
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;; Copyright (c) 2009-2012 Alex Shinn. All rights reserved.
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;; BSD-style license: http://synthcode.com/license.txt
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(define (delete x ls . o)
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(let ((eq (if (pair? o) (car o) equal?)))
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(if (eq? eq eq?)
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(let lp ((ls ls) (rev '())) ;; fast path for delq
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(let ((tail (memq x ls)))
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(if tail
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(lp (cdr tail) (take-up-to-reverse ls tail rev))
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(if (pair? rev) (append-reverse! rev ls) ls))))
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(remove (lambda (y) (eq x y)) ls))))
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(define delete! delete)
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(define (delete-duplicates ls . o)
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(let ((eq (if (pair? o) (car o) equal?)))
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(let lp ((ls ls) (res '()))
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(if (pair? ls)
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(lp (cdr ls) (if (member (car ls) res eq) res (cons (car ls) res)))
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(reverse! res)))))
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(define delete-duplicates! delete-duplicates)
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