[boost] [review][fusion] trouble with a small fusion program.

From: Ronald Garcia (garcia_at_[hidden])
Date: 2006-05-08 11:51:02

I based the program below on the Fusion docs, and it will not compile  
under
powerpc-apple-darwin8-g++-4.0.0 (GCC) 4.0.0 20041026 (Apple Computer,  
Inc. build 4061).  The error I get is:

.../fusion/boost/fusion/sequence/view/filter_view/ 
filter_view_iterator.hpp:40: error: 'call' is not a member of  
'boost::fusion::detail::static_find_if<boost::fusion::vector_iterator<co 
nst boost::fusion::vector<int*, char, std::string,  
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,  
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,  
boost::fusion::void_>, 0>, boost::fusion::vector_iterator<const  
boost::fusion::vector<int*, char, std::string, boost::fusion::void_,  
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,  
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>,  
3>, boost::is_pointer<boost::fusion::vector<int*, char, std::string,  
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,  
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,  
boost::fusion::void_> > >'

Is there an obvious error in the program below?

Thanks,

ron

------------<snip>------------------

#include <boost/fusion/sequence.hpp>
#include <boost/fusion/algorithm.hpp>
#include <boost/type_traits/is_pointer.hpp>

struct nop {
   template <typename T>
   void operator()(T const& x) const { }
};

template <typename Sequence>
void pointer_nop(Sequence const& seq) {
   using boost::fusion::filter_if;
   for_each(filter_if<boost::is_pointer<Sequence> >(seq), nop 
());  /// <<------ Instantiation of this line triggers the error
}

int main() {
   using boost::fusion::vector;
   using boost::fusion::at_c;
   vector<int*,char,std::string> stuff(0,'x', "howdy");
   pointer_nop(stuff);
}