* Makefile.am (srfi_DATA): Added srfi-10.scm and srfi-17.scm.

* srfi-10.scm: New file.

	* srfi-17.scm: New file, contributed by Matthias Koeppe.  Thanks a
	lot!
	Added `Commentary:' tag.

	* srfi-9.scm: Added `Commentary:' tag.

srfi/srfi-17.scm

@@ -0,0 +1,99 @@
+;;;; srfi-17.scm --- SRFI-17 procedures for Guile
+
+;;; Copyright (C) 2001 Free Software Foundation, Inc.
+;;; Originally by Matthias Koeppe <mkoeppe@mail.math.uni-magdeburg.de>
+;;;
+;;; 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, 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 software; see the file COPYING.  If not, write to
+;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+;;; Boston, MA 02111-1307 USA
+
+;;; Commentary:
+
+;; This is an implementation of SRFI-17: Generalized set!
+;;
+;; It exports the Guile procedure `make-procedure-with-setter' under
+;; the SRFI name `getter-with-setter' and exports the standard
+;; procedures `car', `cdr', ..., `cdddr', `string-ref' and
+;; `vector-ref' as procedures with setters, as required by the SRFI.
+;;
+;; SRFI-17 was heavily criticized during its discussion period but it
+;; was finalized anyway.  One issue was its concept of globally
+;; associating setter "properties" with (procedure) values, which is
+;; non-Schemy.  For this reason, this implementation chooses not to
+;; provide a way to set the setter of a procedure.  In fact, (set!
+;; (setter PROC) SETTER) signals an error.  The only way to attach a
+;; setter to a procedure is to create a new object (a "procedure with
+;; setter") via the `getter-with-setter' procedure. This procedure is
+;; also specified in the SRFI.  Using it avoids the described
+;; problems.
+
+;;; Code:
+
+(define-module (srfi srfi-17)
+  :export (getter-with-setter
+	   setter
+	   ;; redefined standard procedures
+	   car cdr caar cadr cdar cddr caaar caadr cadar caddr cdaar
+	   cdadr cddar cdddr caaaar caaadr caadar caaddr cadaar cadadr
+	   caddar cadddr cdaaar cdaadr cdadar cdaddr cddaar cddadr
+	   cdddar cddddr string-ref vector-ref))
+
+;;; Procedures
+
+(define getter-with-setter make-procedure-with-setter)
+
+(define setter
+  (getter-with-setter
+   setter
+   (lambda args
+     (error "Setting setters is not supported for a good reason."))))
+
+;;; Redefine R5RS procedures to appropriate procedures with setters
+
+(define (compose-setter setter location)
+  (lambda (obj value)
+    (setter (location obj) value)))
+
+(define car (getter-with-setter car set-car!))
+(define cdr (getter-with-setter cdr set-cdr!))
+(define caar (getter-with-setter caar (compose-setter set-car! car)))
+(define cadr (getter-with-setter cadr (compose-setter set-car! cdr)))
+(define cdar (getter-with-setter cdar (compose-setter set-cdr! car)))
+(define cddr (getter-with-setter cddr (compose-setter set-cdr! cdr)))
+(define caaar (getter-with-setter caaar (compose-setter set-car! caar)))
+(define caadr (getter-with-setter caadr (compose-setter set-car! cadr)))
+(define cadar (getter-with-setter cadar (compose-setter set-car! cdar)))
+(define caddr (getter-with-setter caddr (compose-setter set-car! cddr)))
+(define cdaar (getter-with-setter cdaar (compose-setter set-cdr! caar)))
+(define cdadr (getter-with-setter cdadr (compose-setter set-cdr! cadr)))
+(define cddar (getter-with-setter cddar (compose-setter set-cdr! cdar)))
+(define cdddr (getter-with-setter cdddr (compose-setter set-cdr! cddr)))
+(define caaaar (getter-with-setter caaaar (compose-setter set-car! caaar)))
+(define caaadr (getter-with-setter caaadr (compose-setter set-car! caadr)))
+(define caadar (getter-with-setter caadar (compose-setter set-car! cadar)))
+(define caaddr (getter-with-setter caaddr (compose-setter set-car! caddr)))
+(define cadaar (getter-with-setter cadaar (compose-setter set-car! cdaar)))
+(define cadadr (getter-with-setter cadadr (compose-setter set-car! cdadr)))
+(define caddar (getter-with-setter caddar (compose-setter set-car! cddar)))
+(define cadddr (getter-with-setter cadddr (compose-setter set-car! cdddr)))
+(define cdaaar (getter-with-setter cdaaar (compose-setter set-cdr! caaar)))
+(define cdaadr (getter-with-setter cdaadr (compose-setter set-cdr! caadr)))
+(define cdadar (getter-with-setter cdadar (compose-setter set-cdr! cadar)))
+(define cdaddr (getter-with-setter cdaddr (compose-setter set-cdr! caddr)))
+(define cddaar (getter-with-setter cddaar (compose-setter set-cdr! cdaar)))
+(define cddadr (getter-with-setter cddadr (compose-setter set-cdr! cdadr)))
+(define cdddar (getter-with-setter cdddar (compose-setter set-cdr! cddar)))
+(define cddddr (getter-with-setter cddddr (compose-setter set-cdr! cdddr)))
+(define string-ref (getter-with-setter string-ref string-set!))
+(define vector-ref (getter-with-setter vector-ref vector-set!))