Re: [boost] Unnamed namespaces?

From: Eric Niebler (eric_at_[hidden])
Date: 2007-06-14 18:21:21

David Abrahams wrote:
> on Thu Jun 14 2007, Eric Niebler <eric-AT-boost-consulting.com> wrote:
>> I also seem to recall that there was still some question as to whether 
>> the use of the reference violated the ODR, if the reference is not 
>> optimized away. I don't think we ever got an answer to that question.
> 
> I don't think there ever was any question about that.  At least, I
> never had a question about it.  References don't have any identity
> distinct from the object they reference.

Funny you should say that, since you were the one who sent the "Are 
references subject to ODR?" question to the std reflector:

> David Abrahams <dave_at_[hidden]>
> 4/1/06 
> 	reply-to	c++std-core_at_[hidden]	 
> 	to		undisclosed-recipients <>	 
> 	date		Apr 1, 2006 9:02 AM	 
> 	subject		Are references subject to ODR?	 
> To: C++ core language mailing list
> Message c++std-core-11390
> 
> Is the following program legal?
> 
>  // a.cpp
>  int x;
>  int& y = x;
> 
>  // b.cpp
>  extern int x;
>  int& y = x;
> 
> My impression is that it is not legal because references are not
> explicitly given an exemption in 3.2/5
> 
> If I am right, should it be so?  It's hard to imagine how this could
> be a problem.

The result of ensuing discussion was that a reference is a pointer, and 
so they *do* have identity.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com
The Astoria Seminar ==> http://www.astoriaseminar.com