[boost] [fusion] empty boost::tuple

From: shunsuke (pstade.mb_at_[hidden])
Date: 2007-09-17 07:36:28

Hi,

Some algorithms doesn't work with empty boost::tuple.
See...

#include <boost/fusion/algorithm/query/find.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/fusion/sequence/container/vector.hpp>
#include <boost/fusion/sequence/adapted/boost_tuple.hpp>
#include <boost/fusion/algorithm/query/count.hpp>

int main()
{
    {
        boost::fusion::vector<> v;
        boost::fusion::begin(v);
        boost::fusion::find<int>(v);
        boost::fusion::count(v, 1);
    }
    {
        boost::tuples::tuple<> t;
        boost::fusion::begin(t);
        //boost::fusion::count(t, 1); // doesn't compile.
        //boost::fusion::find<int>(t);// doesn't compile.
    }
}

(tested on msvc-8.0 and gcc3.4)

I don't know why; errors are very complicated :-(

Regards,

-- 
Shunsuke Sogame