Re: [boost] Generating unique identifiers at compile-time

From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2007-12-04 10:36:03

> >> __LINE__ is not unique in a translation unit. For each included 
> >> header, it is restarted from 1.
> >> So if you happen to use _COUNTER in two boost header files at the 
> >> same line, and the two headers are included by the same 
> c++ file, you 
> >> end up with clashing counters.
> >> Corrado
> 
> 
> You totally missed the point!
> 
> Macros like _COUNTER are not meant to be expanded inside of 
> header files. They're designed to expand inside cpp source 
> files, or be used as part of other macros.
> 
> We all know what the limitations of __LINE__ are, we learned 
> that stuff 20 years ago!

What about using BOOST_PP_COUNTER()/BOOST_PP_UPDATE_COUNTER() ?

Regards Hartmut