home *** CD-ROM | disk | FTP | other *** search
- ;;; installed-scm-file
-
- ;;;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
- ;;;;
- ;;;; 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
- ;;;;
- ;;;; As a special exception, the Free Software Foundation gives permission
- ;;;; for additional uses of the text contained in its release of GUILE.
- ;;;;
- ;;;; The exception is that, if you link the GUILE library with other files
- ;;;; to produce an executable, this does not by itself cause the
- ;;;; resulting executable to be covered by the GNU General Public License.
- ;;;; Your use of that executable is in no way restricted on account of
- ;;;; linking the GUILE library code into it.
- ;;;;
- ;;;; This exception does not however invalidate any other reasons why
- ;;;; the executable file might be covered by the GNU General Public License.
- ;;;;
- ;;;; This exception applies only to the code released by the
- ;;;; Free Software Foundation under the name GUILE. If you copy
- ;;;; code from other Free Software Foundation releases into a copy of
- ;;;; GUILE, as the General Public License permits, the exception does
- ;;;; not apply to the code that you add in this way. To avoid misleading
- ;;;; anyone as to the status of such modified files, you must delete
- ;;;; this exception notice from them.
- ;;;;
- ;;;; If you write modifications of your own for GUILE, it is your choice
- ;;;; whether to permit this exception to apply to your modifications.
- ;;;; If you do not wish that, delete this exception notice.
- ;;;;
-
-
- ;;;; This software is a derivative work of other copyrighted softwares; the
- ;;;; copyright notices of these softwares are placed in the file COPYRIGHTS
- ;;;;
- ;;;; This file is based upon active-slot.stklos from the STk
- ;;;; distribution by Erick Gallesio <eg@unice.fr>.
- ;;;;
-
- (define-module (oop goops active-slot)
- :use-module (oop goops internal)
- :export (<active-class>))
-
- (define-class <active-class> (<class>))
-
- (define-method (compute-get-n-set (class <active-class>) slot)
- (if (eq? (slot-definition-allocation slot) #:active)
- (let* ((index (slot-ref class 'nfields))
- (name (car slot))
- (s (cdr slot))
- (env (class-environment class))
- (before-ref (get-keyword #:before-slot-ref s #f))
- (after-ref (get-keyword #:after-slot-ref s #f))
- (before-set! (get-keyword #:before-slot-set! s #f))
- (after-set! (get-keyword #:after-slot-set! s #f))
- (unbound (make-unbound)))
- (slot-set! class 'nfields (+ index 1))
- (list (lambda (o)
- (if before-ref
- (if (before-ref o)
- (let ((res (%fast-slot-ref o index)))
- (and after-ref (not (eqv? res unbound)) (after-ref o))
- res)
- (make-unbound))
- (let ((res (%fast-slot-ref o index)))
- (and after-ref (not (eqv? res unbound)) (after-ref o))
- res)))
-
- (lambda (o v)
- (if before-set!
- (if (before-set! o v)
- (begin
- (%fast-slot-set! o index v)
- (and after-set! (after-set! o v))))
- (begin
- (%fast-slot-set! o index v)
- (and after-set! (after-set! o v)))))))
- (next-method)))
-