MESSAGE
| DATE | 2011-06-05 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] (fwd) Re: Anonymous namespace
|
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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
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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
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