#include <map>
using namespace std;

#include <boost/mpl/map.hpp>
#include <boost/mpl/at.hpp>
#include <boost/mpl/int.hpp>
using namespace boost;

typedef mpl::map<pair<mpl::int_<0>,int> > Map_t;
mpl::at<Map_t,mpl::int_<0> >::type i;

int main()
{
	return 0;
}

1>c:\boost\include\boost-1_34\boost\mpl\map\aux_\preprocessed\plain\map10.hpp(35) : error C2143: syntax error : missing ',' before 'std::pair<_Ty1,_Ty2>::first'
1> with
1> [
1> _Ty1=boost::mpl::int_<0>,
1> Ty2=int
1> ]
1> c:\boost\include\boost-1_34\boost\mpl\aux_\preprocessed\plain\map.hpp(44) : see reference to class template instantiation 'boost::mpl::map1<P0>' being compiled
1> with
1> [
1> P0=std::pair<boost::mpl::int<0>,int>
1> ]
1> c:\boost\include\boost-1_34\boost\mpl\aux_\has_tag.hpp(20) : see reference to class template instantiation 'boost::mpl::map<T0>' being compiled
1> with
1> [
1> T0=std::pair<boost::mpl::int_<0>,int>
1> ]
1> c:\boost\include\boost-1_34\boost\mpl\sequence_tag.hpp(112) : see reference to class template instantiation 'boost::mpl::aux::has_tag<T>' being compiled
1> with
1> [
1> T=Map_t
1> ]
1> c:\boost\include\boost-1_34\boost\mpl\at.hpp(32) : see reference to class template instantiation 'boost::mpl::sequence_tag<Sequence>' being compiled
1> with
1> [
1> Sequence=Map_t
1> ]
1> d:\visual studio projects\test\main.cpp(10) : see reference to class template instantiation 'boost::mpl::at<Sequence,N>' being compiled
1> with
1> [
1> Sequence=Map_t,
1> N=boost::mpl::int_<0>
1> ]
1>c:\boost\include\boost-1_34\boost\mpl\map\aux_\preprocessed\plain\map10.hpp(36) : error C2143: syntax error : missing ',' before 'std::pair<_Ty1,_Ty2>::second'
1> with
1> [
1> _Ty1=boost::mpl::int_<0>,
1> _Ty2=int
1> ]
1>c:\boost\include\boost-1_34\boost\mpl\map\aux_\preprocessed\plain\map10.hpp(37) : error C2977: 'boost::mpl::m_item' : too many template arguments
1> c:\boost\include\boost-1_34\boost\mpl\map\aux_\item.hpp(79) : see declaration of 'boost::mpl::m_item'
1>c:\boost\include\boost-1_34\boost\mpl\map\aux_\preprocessed\plain\map10.hpp(38) : error C2955: 'boost::mpl::m_item' : use of class template requires template argument list
1> c:\boost\include\boost-1_34\boost\mpl\map\aux_\item.hpp(79) : see declaration of 'boost::mpl::m_item'
1>c:\boost\include\boost-1_34\boost\mpl\map\aux_\preprocessed\plain\map10.hpp(38) : error C2504: 'boost::mpl::m_item' : base class undefined

wird durch zu

typedef mpl::map<std::pair<mpl::int_<0>,int> > Map_t;

um das zu verhindern:

typedef mpl::map<mpl::pair<mpl::int_<0>,int> > Map_t;

Maik