;;; multiple-value-setq.lisp ;;; ;;; Copyright (C) 2004-2007 Peter Graves ;;; $Id$ ;;; ;;; This program 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 2 ;;; of the License, or (at your option) any later version. ;;; ;;; This program 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 this program; if not, write to the Free Software ;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ;;; ;;; As a special exception, the copyright holders of this library give you ;;; permission to link this library with independent modules to produce an ;;; executable, regardless of the license terms of these independent ;;; modules, and to copy and distribute the resulting executable under ;;; terms of your choice, provided that you also meet, for each linked ;;; independent module, the terms and conditions of the license of that ;;; module. An independent module is a module which is not derived from ;;; or based on this library. If you modify this library, you may extend ;;; this exception to your version of the library, but you are not ;;; obligated to do so. If you do not wish to do so, delete this ;;; exception statement from your version. ;; Adapted from CMUCL. (in-package "SYSTEM") (defmacro multiple-value-setq (varlist value-form) (unless (and (listp varlist) (every #'symbolp varlist)) (error "~S is not a list of symbols." varlist)) ;; MULTIPLE-VALUE-SETQ is required always to return the primary value of the ;; value-form, even if varlist is empty. (if varlist `(values (setf (values ,@varlist) ,value-form)) `(values ,value-form)))