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 15:40:46 +1200
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Xref: panix comp.lang.c++:1085999
On 06/ 4/11 02:40 PM, Ruben Safir wrote:
> Ian Collins wrote:
>> On 06/ 3/11 06:29 PM, ruben safir wrote:
>>> On 06/02/2011 10:54 PM, 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.
>>>
>>> please expand?
>>
>> One way to look at the anonymous namespace is to consider it a namespace
>> with a cryptic name. That name is only known within the current
>> compilation unit. Thus anything declared within the namespace can't
>> been seen elsewhere because the namespace name is unknown.
>>
>> So I could write
>>
>> namespace { int n; }
>>
>> and n would only be visible within the current compilation unit whereas
>>
>> int n;
>>
>> would be globally visible.
>
> so the annonymous name space must be in the same file as main?
No, it can be an any compilation unit, that's one of the reasons for its
existence.
I could have write "namespace { int n; }" in a dozen source files (or a
header they include) and there would be a dozen unique instances of n.
--
Ian Collins
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