source: trunk/j/src/org/armedbear/lisp/multiple-value-setq.lisp @ 11135

Last change on this file since 11135 was 11135, checked in by piso, 14 years ago

MULTIPLE-VALUE-SETQ: return the primary value of the value-form, even if varlist is empty (Eric Marsden).

File size: 1.3 KB
Line 
1;;; multiple-value-setq.lisp
2;;;
3;;; Copyright (C) 2004-2007 Peter Graves
4;;; $Id: multiple-value-setq.lisp,v 1.2 2007-02-15 11:37:08 piso Exp $
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;; Adapted from CMUCL.
21
22(in-package "SYSTEM")
23
24(defmacro multiple-value-setq (varlist value-form)
25  (unless (and (listp varlist) (every #'symbolp varlist))
26    (error "~S is not a list of symbols." varlist))
27  ;; MULTIPLE-VALUE-SETQ is required always to return the primary value of the
28  ;; value-form, even if varlist is empty.
29  (if varlist
30    `(values (setf (values ,@varlist) ,value-form))
31    `(values ,value-form)))
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