From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.org!not-for-mail
From: Joseph Brenner <doom@kzsu.stanford.edu>
Newsgroups: gmane.emacs.help
Subject: Re: [ELISP] How do you turn an array of chars into a string?
Date: Tue, 03 Aug 2010 13:57:44 -0700
Message-ID: <877hk776t3.fsf@kzsu.stanford.edu>
References: <87wrsae07o.fsf@kzsu.stanford.edu>
	<jwviq3s1zn2.fsf-monnier+gnu.emacs.help@gnu.org>
NNTP-Posting-Host: lo.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Trace: dough.gmane.org 1291854839 24651 80.91.229.12 (9 Dec 2010 00:33:59 GMT)
X-Complaints-To: usenet@dough.gmane.org
NNTP-Posting-Date: Thu, 9 Dec 2010 00:33:59 +0000 (UTC)
To: help-gnu-emacs@gnu.org
Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Dec 09 01:33:55 2010
Return-path: <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Envelope-to: geh-help-gnu-emacs@m.gmane.org
Original-Received: from lists.gnu.org ([199.232.76.165])
	by lo.gmane.org with esmtp (Exim 4.69)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>)
	id 1PQUSH-0006fK-EX
	for geh-help-gnu-emacs@m.gmane.org; Thu, 09 Dec 2010 01:33:53 +0100
Original-Received: from localhost ([127.0.0.1]:40791 helo=lists.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43)
	id 1PQUSG-0000iw-NE
	for geh-help-gnu-emacs@m.gmane.org; Wed, 08 Dec 2010 19:33:52 -0500
Original-Path: usenet.stanford.edu!news.glorb.com!news2.glorb.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.posted.rawbandwidth!news.posted.rawbandwidth.POSTED!not-for-mail
Original-NNTP-Posting-Date: Tue, 03 Aug 2010 15:57:32 -0500
Original-Newsgroups: gnu.emacs.help
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)
Cancel-Lock: sha1:rxc4UifxkWcrFcSi6/04iw5bFak=
Original-Lines: 30
X-Usenet-Provider: http://www.giganews.com
Original-NNTP-Posting-Host: 198.144.208.84
Original-X-Trace: sv3-jRauu5s7v56fo2STwToh9hJEyYQjoMJPRsvHqG1nV7NpEogTZUEKW/taS/8aWgQJBPIqS3x4a0Q0dqn!1DISH7QA39tMji4Lw06ZTOdUTckhIngfjgZbu8sqNi8sSP7vaeFk3KfcBN/R5WuttHrXSeBN57k=
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint
	properly
X-Postfilter: 1.3.40
Original-Xref: usenet.stanford.edu gnu.emacs.help:180326
X-BeenThere: help-gnu-emacs@gnu.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Users list for the GNU Emacs text editor <help-gnu-emacs.gnu.org>
List-Unsubscribe: <http://lists.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/help-gnu-emacs>
List-Post: <mailto:help-gnu-emacs@gnu.org>
List-Help: <mailto:help-gnu-emacs-request@gnu.org?subject=help>
List-Subscribe: <http://lists.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=subscribe>
Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org
Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org
Xref: news.gmane.org gmane.emacs.help:76303
Archived-At: <http://permalink.gmane.org/gmane.emacs.help/76303>


Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> What if you want to convert an array-of-chars into a string?
>
> A string *is* an array of chars.

Yes, I've heard that, but:

  (let ((mah-array  [?c ?a ?t])
        (mah-string "cat"))
        (equal mah-array mah-string))  ;; ==> nil

  (let ((mah-array  [?c ?a ?t])
        (mah-string "cat"))
        (string= mah-array mah-string))
   ;; Lisp error: (wrong-type-argument stringp [99 97 116])

Though on the other hand:

  (equal
    (aref [?c ?a ?t] 2)
    (aref "cat" 2))      ;; ==> t

In any case, it doesn't exactly make sense to me to just say
that "a string is an array of chars".

I suppose you might say "a string is an array of chars, with a type
of 'string'".