Re: [boost] [accumulator] A lot of unused "parameter" warnings

Subject: Re: [boost] [accumulator] A lot of unused "parameter" warnings
From: Roland Bock (rbock_at_[hidden])
Date: 2011-10-01 17:37:13

On 10/01/2011 08:51 PM, Vicente J. Botet Escriba wrote:
> Le 01/10/11 20:03, Eric Niebler a écrit :
>> On 10/1/2011 9:29 AM, Vicente J. Botet Escriba wrote:
>>> Would you accept a patch that resolve them by commenting the
>>> parameter name?
>> Patches gladly accepted. Just open a ticket on svn.boost.org and
>> attach the patch. Thanks!
>>
> Well, I have reached to remove the warnings in Boost.Parameter and
> Boost.Fusion.
>
> The warnings in Boost.Accumulators are related to static variables
> included in a unnamed namespace such as
>
> ../../../boost/accumulators/numeric/functional_fwd.hpp:187:38:
> warning: unused variable 'min_assign' [-Wunused-variable]
>         extern op::min_assign const &min_assign;
>
> Unfortunately, I don't know how to silent these warnings :(
>
> Have you an idea how to silent them?
>
> Best,
> Vicente
>

I had the same problem with some other library. I used the following
method to silence the warnings (replaced namespaces):

namespace boost
{
  template<class T> void touch(const T&) {}
}

#define BOOST_TOUCH_FUNC(WHAT) \
  namespace\
  {\
     template<class T> void touch_WHAT()\
     { boost::touch(WHAT); }\
  }

#define BOOST_TOUCH_VAL(WHAT) boost::touch(WHAT);

If you find that useful, too, maybe it could be added to boost utility? There is similar stuff in some libraries, but none of it is documented, I think.

Regards,

Roland