Re: [boost] none.hpp

From: Fernando Cacciola (fernando_cacciola_at_[hidden])
Date: 2006-07-25 09:32:29

Martin Wille wrote:
> Joe Gottman wrote:
> 
>>In order to avoid having an unnamed namespace inside a header file, none.hpp 
>>has been rewritten as
>>
>>    namespace boost {
>>        none_t const none = ((none_t)0) ;
>>    } // namespace
>>
>>But if two source files contain none.hpp won't this violate the 
>>one-definition rule?
> 
> 
> none would have internal linkage according to 7.1.5.1/2. So it wouldn't
> violate the ODR. But a pointer to none from one translation unit would
> differ from a pointer to none from a different TU.
> 
Does this difference matter?

Fernando Cacciola