GNU bug report logs - #7088
`copy-tree' of a vector copy sharing structure.with original

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#7088: closed (`copy-tree' of a vector copy sharing
 structure.with original)
Date: Thu, 23 Sep 2010 08:46:03 +0000

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Your message dated Thu, 23 Sep 2010 10:47:36 +0200
with message-id <m3bp7oonh3.fsf <at> hase.home>
and subject line Re: bug#7088: `copy-tree' of a vector copy sharing structure.with original
has caused the GNU bug report #7088,
regarding `copy-tree' of a vector copy sharing structure.with original
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
7088: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7088
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Contact help-debbugs <at> gnu.org with problems

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From: MON KEY <monkey <at> sandpframing.com>
To: bug-gnu-emacs <at> gnu.org
Cc: 7083 <at> debbugs.gnu.org, Andreas Schwab <schwab <at> linux-m68k.org>
Subject: `copy-tree' of a vector copy sharing structure.with original
Date: Thu, 23 Sep 2010 01:28:33 -0400

When copy-tree copies vectors the copy shares structure with the original.

This is unlike the behavior of copy-tree on a list of lists:

(let ((orig '((a b) (c d) (e f) (g h)))
      new-cp)
  (setq new-cp (copy-tree orig))
  (equal (elt
          (prog1 orig
            (setf (car new-cp) "bubba")) 0)
         '(a b)))
;=> t

(let ((orig [[a b] [c d] [e f] [g h]])
      new-cp)
  (setq new-cp (copy-tree orig))
  (string-equal (aref (prog1 orig
                        (aset new-cp 0 "bubba"))
                      0)
                "bubba"))
;=> t

Shouldn't idx 0 of the orig tree still be [a b]?

Note This bug _should_ prob. have stayed with Bug7083 but that bug
report was prematurely closed.

--
/s_P\

[Message part 3 (message/rfc822, inline)]

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: MON KEY <monkey <at> sandpframing.com>
Cc: 7083 <at> debbugs.gnu.org, 7088-done <at> debbugs.gnu.org
Subject: Re: bug#7088: `copy-tree' of a vector copy sharing structure.with
	original
Date: Thu, 23 Sep 2010 10:47:36 +0200

MON KEY <monkey <at> sandpframing.com> writes:

> When copy-tree copies vectors the copy shares structure with the original.

Works as documented.  A vector is not a cons cell.

If TREE is a cons cell, this recursively copies both its car and its cdr.
             ^^^^^^^^^

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

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