MESSAGE
| DATE | 2011-06-05 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] (fwd) Re: Anonymous namespace
|
From owner-hangout-outgoing-at-mrbrklyn.com Sun Jun 5 00:27:49 2011
Return-Path:
X-Original-To: archive-at-mrbrklyn.com
Delivered-To: archive-at-mrbrklyn.com
Received: by www2.mrbrklyn.com (Postfix)
id 87DFE100BCF; Sun, 5 Jun 2011 00:27:47 -0400 (EDT)
Delivered-To: hangout-outgoing-at-www2.mrbrklyn.com
Received: by www2.mrbrklyn.com (Postfix, from userid 28)
id 7AE7C100B92; Sun, 5 Jun 2011 00:27:46 -0400 (EDT)
Delivered-To: hangout-at-nylxs.com
Received: from mailbackend.panix.com (mailbackend.panix.com [166.84.1.89])
by www2.mrbrklyn.com (Postfix) with ESMTP id 188CE100B88
for ; Sun, 5 Jun 2011 00:27:25 -0400 (EDT)
Received: from panix2.panix.com (panix2.panix.com [166.84.1.2])
by mailbackend.panix.com (Postfix) with ESMTP id 528E132F10
for ; Sun, 5 Jun 2011 00:27:38 -0400 (EDT)
Received: by panix2.panix.com (Postfix, from userid 20529)
id 3C36433C5F; Sun, 5 Jun 2011 00:27:38 -0400 (EDT)
From: Ruben Safir
To: hangout-at-nylxs.com
Subject: [NYLXS - HANGOUT] (fwd) Re: Anonymous namespace
User-Agent: tin/1.8.3-20070201 ("Scotasay") (UNIX) (NetBSD/5.1 (i386))
Message-Id: <20110605042738.3C36433C5F-at-panix2.panix.com>
Date: Sun, 5 Jun 2011 00:27:38 -0400 (EDT)
Sender: owner-hangout-at-mrbrklyn.com
Precedence: bulk
Reply-To: hangout-at-mrbrklyn.com
-- forwarded message --
Path: reader1.panix.com!panix!newsfeed-00.mathworks.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: Ian Collins
Newsgroups: comp.lang.c++
Subject: Re: Anonymous namespace
Date: Sat, 04 Jun 2011 15:57:57 +1200
Lines: 38
Message-ID: <94toq5FivcU2-at-mid.individual.net>
References: <03464db0-e118-463c-9834-171dab457e42-at-h9g2000yqk.googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Trace: individual.net hY0Mz3iNUo7f794wMToOSgENRwAXOQEmaEK3ay1ibzI3usCyzi
Cancel-Lock: sha1:/mSKmjsLAr/toxAmiU/H+cxzJPc=
User-Agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.9.2.9) Gecko/20101021 Lightning/1.0b2 Thunderbird/3.1.4
In-Reply-To:
Xref: panix comp.lang.c++:1086000
On 06/ 4/11 01:44 AM, Victor Bazarov wrote:
> On 6/3/2011 4:08 AM, gwowen wrote:
>> On Jun 3, 3:54 am, r...-at-zedat.fu-berlin.de (Stefan Ram) wrote:
>>>> What is the point of the anonymous namespace.
>>>
>>> Names can be hidden from the linker (from other translation
>>> units), even if they should have external linkage.
>>
>> Can someone give the benefits of external-but-unlinkable anon-
>> namespace variables (or functions) against old-school internal linkage
>> file-scope "static" variables and functions.
>
> The Standard prohibits the use of names with no linkage or names with
> internal linkage as template arguments. Only objects with external
> linkage are allowed. Hence you can't use a function declared 'static'
> or a local type as a predicate in 'std::sort', for instance, or as the
> functor in 'std::for_each', and so on.
I was going to answer Ruben's last question with an example, but I
couldn't find one that failed to compile with a static function!
This compiles file on everything I tried:
#include
static void test( int ) {}
static bool test1( int, int ) { return true; }
int main()
{
int arr[4] = { 2,1,5,3 };
std::for_each( arr, arr+4, test );
std::sort( arr, arr+4, test1 );
}
--
Ian Collins
-- end of forwarded message --
|
|
