Re: [Boost-users] [xpressive] un-used variables

From: Jeff Flinn (TriumphSprint2000_at_[hidden])
Date: 2007-11-06 08:02:48

hi eric,

Eric Niebler wrote:
> Jeff Flinn wrote:
>> We compile our app with -Wunused-variables on the Mac with gcc 4.0. We 
>> get several unused variable warnings  due to 
>> <boost/xpressive/regex_primitives.hpp>.
>>
>> Is there some facility for quieting these from xpressive itself? We 
>> currently are using #pragma unused ( eol, ...) to quiet the list of 
>> about 15 unused variables.
> 
> 
> Are you using the version of xpressive in 1.34, or in the latest .zip 

We're using 1.34.1.

> archive from the Boost file vault? In the latest code, I have tried to 
> stifle these warnings by adding the following to regex_primitives.hpp:
> 
> namespace detail
> {
>      inline void ignore_unused_regex_primitives()
>      {
>          ignore_unused(repeat_max);
>          ignore_unused(inf);
>          ignore_unused(epsilon);
>          ...
>          ignore_unused(keep);
>      }
> }
> 
> where ignore_unused() is merely:
> 
>      template<typename T>
>      void ignore_unused(T const &)
>      {
>      }
> 
> That seems to work for me. You might try something similar.

Aah, that looks like the trick. Will this make it into 1.35?

Thanks, Jeff Flinn