| [3444] | 1 | ;;; -*- mode: lisp; package: maxima; syntax: common-lisp; base: 10 -*-
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| 2 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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| 3 | ;;;
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| 4 | ;;; copyright (c) 1999, 2002, 2009, 2015 marek rychlik <rychlik@u.arizona.edu>
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| 5 | ;;;
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| 6 | ;;; this program is free software; you can redistribute it and/or modify
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| 7 | ;;; it under the terms of the gnu general public license as published by
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| 8 | ;;; the free software foundation; either version 2 of the license, or
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| 9 | ;;; (at your option) any later version.
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| 10 | ;;;
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| 11 | ;;; this program is distributed in the hope that it will be useful,
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| 12 | ;;; but without any warranty; without even the implied warranty of
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| 13 | ;;; merchantability or fitness for a particular purpose. see the
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| 14 | ;;; gnu general public license for more details.
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| 15 | ;;;
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| 16 | ;;; you should have received a copy of the gnu general public license
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| 17 | ;;; along with this program; if not, write to the free software
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| 18 | ;;; foundation, inc., 59 temple place - suite 330, boston, ma 02111-1307, usa.
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| 19 | ;;;
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| 20 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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| 21 |
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| 22 | (defpackage "COPY"
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| 23 | (:use :cl)
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| 24 | (:export "COPY-INSTANCE")
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| 25 | (:shadowing-import-from
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| 26 | #+openmcl-native-threads #:ccl
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| 27 | #+cmu #:pcl
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| 28 | #+sbcl #:sb-pcl
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| 29 | #+lispworks #:hcl
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| 30 | #+allegro #:mop
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| 31 | #+clisp #:clos
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| 32 | #:class-slots #:slot-definition-name)
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| [3457] | 33 | (:documentation "Implements generic clone operation."))
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| [3444] | 34 |
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| 35 | (in-package :copy)
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| 36 |
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| 37 |
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| 38 | ;; Source: http://stackoverflow.com/questions/11067899/is-there-a-generic-method-for-cloning-clos-objects
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| 39 | ;; NOTE: This is a shallow copy. Add an around method for classes which need deep copy of the slots.
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| 40 | (defgeneric copy-instance (object &rest initargs &key &allow-other-keys)
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| 41 | (:method ((object cons) &rest initargs &key &allow-other-keys)
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| [3445] | 42 | (declare (ignore initargs))
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| [3444] | 43 | (copy-seq object))
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| 44 | (:documentation "Makes and returns a shallow copy of OBJECT.
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| 45 |
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| 46 | An uninitialized object of the same class as OBJECT is allocated by
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| 47 | calling ALLOCATE-INSTANCE. For all slots returned by
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| 48 | CLASS-SLOTS, the returned object has the
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| 49 | same slot values and slot-unbound status as OBJECT.
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| 50 |
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| 51 | REINITIALIZE-INSTANCE is called to update the copy with INITARGS.")
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| 52 | (:method ((object standard-object) &rest initargs &key &allow-other-keys)
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| 53 | (let* ((class (class-of object))
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| 54 | (copy (allocate-instance class)))
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| 55 | (dolist (slot-name (mapcar #'slot-definition-name (class-slots class)))
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| 56 | (when (slot-boundp object slot-name)
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| 57 | (setf (slot-value copy slot-name)
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| 58 | (slot-value object slot-name))))
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| 59 | (apply #'reinitialize-instance copy initargs))))
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| [3460] | 60 |
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| 61 | #|
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| 62 | ;; A stripped-down version of shallow copy
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| 63 | ;; Source: http://stackoverflow.com/questions/11067899/is-there-a-generic-method-for-cloning-clos-objects
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| 64 | (defun shallow-copy-object (original)
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| 65 | (let* ((class (class-of original))
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| 66 | (copy (allocate-instance class)))
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| 67 | (dolist (slot (mapcar #'slot-definition-name (class-slots class)))
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| 68 | (when (slot-boundp original slot)
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| 69 | (setf (slot-value copy slot)
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| 70 | (slot-value original slot))))
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| 71 | copy))
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| 72 | |#
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