source: trunk/abcl/src/org/armedbear/lisp/map-into.lisp @ 14215

Last change on this file since 14215 was 11391, checked in by vvoutilainen, 12 years ago

ABCL license is GPL + Classpath exception. This was intended
by Peter Graves, the original author. For reference, see
http://sourceforge.net/mailarchive/forum.php?thread_name=20040721115302.839%40prufrock&forum_name=armedbear-j-announce

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.1 KB
Line 
1;;; map-into.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: map-into.lisp 11391 2008-11-15 22:38:34Z vvoutilainen $
5;;;
6;;; This program is free software; you can redistribute it and/or
7;;; modify it under the terms of the GNU General Public License
8;;; as published by the Free Software Foundation; either version 2
9;;; of the License, or (at your option) any later version.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14;;; GNU General Public License for more details.
15;;;
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19;;;
20;;; As a special exception, the copyright holders of this library give you
21;;; permission to link this library with independent modules to produce an
22;;; executable, regardless of the license terms of these independent
23;;; modules, and to copy and distribute the resulting executable under
24;;; terms of your choice, provided that you also meet, for each linked
25;;; independent module, the terms and conditions of the license of that
26;;; module.  An independent module is a module which is not derived from
27;;; or based on this library.  If you modify this library, you may extend
28;;; this exception to your version of the library, but you are not
29;;; obligated to do so.  If you do not wish to do so, delete this
30;;; exception statement from your version.
31
32(in-package "COMMON-LISP")
33
34(export 'map-into)
35
36;;; MAP-INTO (from CMUCL)
37
38(defun map-into (result-sequence function &rest sequences)
39  (let* ((fp-result
40    (and (arrayp result-sequence)
41         (array-has-fill-pointer-p result-sequence)))
42   (len (apply #'min
43         (if fp-result
44       (array-dimension result-sequence 0)
45       (length result-sequence))
46         (mapcar #'length sequences))))
47
48    (when fp-result
49      (setf (fill-pointer result-sequence) len))
50
51    (dotimes (index len)
52      (setf (elt result-sequence index)
53      (apply function
54       (mapcar #'(lambda (seq) (elt seq index))
55         sequences)))))
56  result-sequence)
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