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文件: /usr/share/guile/3.0/ice-9/list.scm
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;;;; List functions not provided in R5RS or srfi-1 ;;; Copyright (C) 2003, 2006 Free Software Foundation, Inc. ;;; ;;;; This library is free software; you can redistribute it and/or ;;;; modify it under the terms of the GNU Lesser General Public ;;;; License as published by the Free Software Foundation; either ;;;; version 3 of the License, or (at your option) any later version. ;;;; ;;;; This library 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 ;;;; Lesser General Public License for more details. ;;;; ;;;; You should have received a copy of the GNU Lesser General Public ;;;; License along with this library; if not, write to the Free Software ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA (define-module (ice-9 list) :export (rassoc rassv rassq)) (define (generic-rassoc key alist =) (let loop ((ls alist)) (and (not (null? ls)) (if (= key (cdar ls)) (car ls) (loop (cdr ls)))))) (define (rassoc key alist . =) (generic-rassoc key alist (if (null? =) equal? (car =)))) (define (rassv key alist) (generic-rassoc key alist eqv?)) (define (rassq key alist) (generic-rassoc key alist eq?))
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