From mboxrd@z Thu Jan  1 00:00:00 1970
Path: main.gmane.org!not-for-mail
From: Jesper Harder <harder@myrealbox.com>
Newsgroups: gmane.emacs.help
Subject: decode-coding-string and consing
Date: Mon, 10 Feb 2003 17:47:53 +0100
Organization: http://purl.org/harder/
Sender: help-gnu-emacs-bounces+gnu-help-gnu-emacs=m.gmane.org@gnu.org
Message-ID: <m3hebc13ra.fsf@defun.localdomain>
NNTP-Posting-Host: main.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Trace: main.gmane.org 1044895789 26631 80.91.224.249 (10 Feb 2003 16:49:49 GMT)
X-Complaints-To: usenet@main.gmane.org
NNTP-Posting-Date: Mon, 10 Feb 2003 16:49:49 +0000 (UTC)
Return-path: <help-gnu-emacs-bounces+gnu-help-gnu-emacs=m.gmane.org@gnu.org>
Original-Received: from monty-python.gnu.org ([199.232.76.173])
	by main.gmane.org with esmtp (Exim 3.35 #1 (Debian))
	id 18iH7p-0006v5-00
	for <gnu-help-gnu-emacs@m.gmane.org>; Mon, 10 Feb 2003 17:49:45 +0100
Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org)
	by monty-python.gnu.org with esmtp (Exim 4.10.13)
	id 18iH8U-000708-05
	for gnu-help-gnu-emacs@m.gmane.org; Mon, 10 Feb 2003 11:50:26 -0500
Original-Path: shelby.stanford.edu!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newsfeed.stueberl.de!peernews3.colt.net!colt.net!news.tele.dk!not-for-mail
Original-Newsgroups: gnu.emacs.help
X-Face: ^RrvqCr7c,P$zTR:QED"@h9+BTm-"fjZJJ-3=OU7.)i/K]<.J88}s>'Z_$r;
	<N5ksn~%wJ@2pjF}="tV;FBsdpFarSWA<oYkZsViGf:F^SD-KXhvFxh;~]?)SWm~+u};
	0=x}<vOm&5J+?]yB2d]q4x8\0g7SX
Mail-Copies-To: never
User-Agent: Gnus/5.090016 (Oort Gnus v0.16) Emacs/21.3.50
Cancel-Lock: sha1:MmQ2MR9+F3ChSFQlS/6RD1FMdUI=
Original-Lines: 17
Original-NNTP-Posting-Host: 195.215.224.223
Original-X-Trace: 1044895802 dtext01.news.tele.dk 135 195.215.224.223
Original-X-Complaints-To: abuse@post.tele.dk
Original-Xref: shelby.stanford.edu gnu.emacs.help:110027
Original-To: help-gnu-emacs@gnu.org
X-BeenThere: help-gnu-emacs@gnu.org
X-Mailman-Version: 2.1b5
Precedence: list
List-Id: Users list for the GNU Emacs text editor <help-gnu-emacs.gnu.org>
List-Help: <mailto:help-gnu-emacs-request@gnu.org?subject=help>
List-Post: <mailto:help-gnu-emacs@gnu.org>
List-Subscribe: <http://mail.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=subscribe>
List-Archive: <http://mail.gnu.org/pipermail/help-gnu-emacs>
List-Unsubscribe: <http://mail.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=unsubscribe>
Errors-To: help-gnu-emacs-bounces+gnu-help-gnu-emacs=m.gmane.org@gnu.org
Xref: main.gmane.org gmane.emacs.help:6532
X-Report-Spam: http://spam.gmane.org/gmane.emacs.help:6532

,----[ C-h f decode-coding-string RET ]
| decode-coding-string is a built-in function.
| (decode-coding-string STRING CODING-SYSTEM &optional NOCOPY)
| 
| Decode STRING which is encoded in CODING-SYSTEM, and return the result.
| Optional arg NOCOPY non-nil means it is OK to return STRING itself
| if the decoding operation is trivial.
`----

Under what conditions is the decoding operation "trivial"?

I was hoping that something like:

  (decode-coding-string "abc" 'us-ascii t) or
  (decode-coding-string "abc" 'latin-1 t)

wouldn't cons a new string; but unfortunaley it does.