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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: EARRAYSIZE
Date: Fri, 04 Apr 2014 11:15:32 +0300
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> Date: Fri, 04 Apr 2014 12:06:59 +0400
> From: Dmitry Antipov <dmantipov@yandex.ru>
> CC: emacs-devel@gnu.org
> 
> On 04/04/2014 11:45 AM, Eli Zaretskii wrote:
> 
> > I suggested ALEN because we have AREF and ASIZE.  Maybe AELTS or
> > ALENGTH would be better.
> 
> IMO this will confuse the reader because AREF and ASIZE are for Lisp_Objects and not for C arrays.

It could, yes.

> What about MS-style countof (http://msdn.microsoft.com/en-us/library/ms175773%28v=VS.100%29.aspx)?

I'd prefer a capitalized name, FWIW.