Re: [boost] Unnamed namespaces?

From: Arkadiy Vertleyb (vertleyb_at_[hidden])
Date: 2007-06-12 14:31:36

"Bryan Ewbank" <ewbank_at_[hidden]> wrote

> To say this another way, there is never an unnamed namespace; any 
> namespace
> for which you do not specify a name is effectively given a randomly
> generated name.  That means each time you include a header file with an
> "unnamed" namespace, you are creating a separate instance of everything in
> that namespace.

Which by itself is not a problem, unless it is used in the definition of yet 
another class, defined in a header and _not_ inside unnamed namespace.  This 
another class, when #included from different TUs, becomes defined 
differently in different TUs, hence ODR violation.

Regards,
Arkadiy

>
> On 6/10/07, Arkadiy Vertleyb <vertleyb_at_[hidden]> wrote:
>>
>> "Gennadiy Rozental" <gennadiy.rozental_at_[hidden]> wrote
>>
>> > Are there any problems with unnamed namespace usage within Boost.Test?
>>
>> Using unnamed namespace inside a header represents a potential ODR
>> violation.  See if you have this kind of usage.
>>
>> Regards,
>> Arkadiy
>>
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