Re: [boost] [fusion] for_each on gcc 4.7

Subject: Re: [boost] [fusion] for_each on gcc 4.7
From: Daniel Larimer (dlarimer_at_[hidden])
Date: 2012-06-20 21:57:10

On Jun 20, 2012, at 7:36 PM, Joel de Guzman wrote:

> On 6/20/2012 1:37 PM, Daniel Larimer wrote:
>> I recently attempted to update to gcc 4.7 and code that compiled with 4.5.3 broke.
>> 
>> It appears that boost::fusion expects boost::fusion::random_access_traversal_tag to implicitly cast to mpl::bool_<false>.
>> 
>> Switching the 3rd argument from mpl::bool_<false>  to an extra template arg (that was ignored), seems to fix the compilation errors.
>> 
>> Compiled with std=c++11
> 
> Do you have a minimal test case?

#include <boost/fusion/container/vector.hpp>
#include <boost/fusion/algorithm.hpp>
#include <boost/fusion/include/make_vector.hpp>

struct visitor {
  template<typename T>
  void operator()( T t )const{}
};

int main() {
   visitor v;
   boost::fusion::for_each( boost::fusion::make_vector(5,6.6), v );
   return 0;
}

> 
> Regards,
> -- 
> Joel de Guzman
> http://www.boostpro.com
> http://boost-spirit.com
> 
> 
> 
> 
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