id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
3175,compilation error about fusion::traits::tag_of using msvc 8.0,Tang Jiang Jun <tangjiangjun@…>,Joel de Guzman,"I met a compilation error about matching the proper tag_of metafunction. The code snippet is shown as follow.

#include <boost/fusion/support.hpp>
#include <boost/fusion/container.hpp>
#include <boost/fusion/sequence.hpp>
#include <boost/fusion/algorithm.hpp>

#include <string>
#include <iostream>

using namespace std;
using namespace boost;

int _tmain(int argc, _TCHAR* argv[])
{
	typedef fusion::vector< int, char, string > VecTuple;
	VecTuple stuff( 1, 'a', ""Hello, fusion!"" );

	cout << stuff << endl;
	return 0;
}

The error message is:
1>e:\libraries\boost_1_37_0\boost\fusion\support\is_sequence.hpp(59) : error C2039: 'tag_of' : is not a member of 'boost::fusion::traits::detail'
1>        e:\libraries\boost_1_37_0\boost\utility\enable_if.hpp(36) : see reference to class template instantiation 'boost::fusion::traits::is_sequence<T>' being compiled
1>        with
1>        [
1>            T=VecTuple
1>        ]
1>        e:\samples\boost\fusion\fusion.cpp(52) : see reference to class template instantiation 'boost::enable_if<Cond,T>' being compiled
1>        with
1>        [
1>            Cond=boost::fusion::traits::is_sequence<VecTuple>,
1>            T=std::ostream &
1>        ]

I found that if adding the full namespace 'boost::fusion' before '::detail::tag_of' in the file 'is_sequence.hpp', everything will be OK. So I think that maybe is a namespace lookup error in msvc.


",Bugs,closed,Boost 1.40.0,fusion,Boost 1.39.0,Problem,fixed,tag_of is_sequence,