source: trunk/j/src/org/armedbear/lisp/multiple-value-setq.lisp @ 11391

Last change on this file since 11391 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

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.0 KB
[6396]1;;; multiple-value-setq.lisp
[11135]3;;; Copyright (C) 2004-2007 Peter Graves
[11297]4;;; $Id: multiple-value-setq.lisp 11391 2008-11-15 22:38:34Z vvoutilainen $
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.
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14;;; GNU General Public License for more details.
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.
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.
32;; Adapted from CMUCL.
34(in-package "SYSTEM")
36(defmacro multiple-value-setq (varlist value-form)
37  (unless (and (listp varlist) (every #'symbolp varlist))
38    (error "~S is not a list of symbols." varlist))
[11135]39  ;; MULTIPLE-VALUE-SETQ is required always to return the primary value of the
40  ;; value-form, even if varlist is empty.
41  (if varlist
42    `(values (setf (values ,@varlist) ,value-form))
43    `(values ,value-form)))
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