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 16:01:38 +1200
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Message-ID: <94tp12FivcU3-at-mid.individual.net>
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Xref: panix comp.lang.c++:1086001
On 06/ 4/11 02:48 PM, Ruben Safir wrote:
> Michael Doubez wrote:
>> On 3 juin, 03:53, ruben safir wrote:
>>> what is the anonymous name space and how is it accessed?
>>
>> In brief, the effect is the same as C 'static' for functions and
>> global variables.
>>
> I'm confused because i thought what static did was create a variable
> which isn't destroyed between function calls and remembers its state.
> How that was accomplished, I'm uncertain of.
The static keyword suffers from overload abuse. In the global scope, a
static variable has local linkage, at function scope it does as you say
above.
>> // not in class of function scope
>> static int N; // N is only visible in file
>>
>> static void foo(){ // foo can only be called in file
>> // ...
>> }
>>
>> The interest is that it also work on type definition.
>>
>> namespace {
>>
>> // Bar can only be seen in file
>> class Bar
>> {
>> // ...
>> };
>>
>> }
>>
>> And it has also the same side effect that, when included in multiple
>> translation unit (through a header by example), each translation unit
>> will have its own definition of the class. This means that, by
>> example, class member variables are not shared.
>
> I thought class member variables are not shared by defauult?
I assumed he was referring to the member variable declarations.
--
Ian Collins
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