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Eric S. Raymond 1992-05-30 21:11:25 +00:00
parent d501f51645
commit c88ab9ce4a
40 changed files with 280 additions and 120 deletions
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24
lisp/emacs-lisp/ring.el
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@ -1,5 +1,23 @@
;;; Ring Code
;;;============================================================================
;;; ring.el --- handle rings of marks
;; Copyright (C) 1992 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 1, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; This code defines a ring data structure. A ring is a
;;; (hd-index tl-index . vector)
;;; list. You can insert to, remove from, and rotate a ring. When the ring
@ -99,3 +117,5 @@ Answer is guaranteed to be non-negative, and less than m."
(vec-index (comint-mod (+ index hd)
(length vec))))
(aref vec vec-index)))))
;;; ring.el ends here