template<long long lMin,long long lMax>
	class CGT
{
private:
	typedef mpl::vector<
			mpl::vector<mpl::integral_c<long long,CHAR_MIN>,
				mpl::integral_c<long long,CHAR_MAX>,
				char>,
			mpl::vector<mpl::integral_c<long long,0>,
				mpl::integral_c<long long,UCHAR_MAX>,
				unsigned char>,
			mpl::vector<mpl::integral_c<long long,SHRT_MIN>,
				mpl::integral_c<long long,SHRT_MAX>,
				short>,
			mpl::vector<mpl::integral_c<long long,0>,
				mpl::integral_c<long long,USHRT_MAX>,
				unsigned short>,
			mpl::vector<mpl::integral_c<long long,INT_MIN>,
				mpl::integral_c<long long,INT_MAX>,
				int>,
			mpl::vector<mpl::integral_c<long long,0>,
				mpl::integral_c<long long,UINT_MAX>,
				unsigned int>,
			mpl::vector<mpl::integral_c<long long,LONG_MIN>,
				mpl::integral_c<long long,LONG_MAX>,
				long>,
			mpl::vector<mpl::integral_c<long long,0>,
				mpl::integral_c<long long,ULONG_MAX>,
				unsigned long>  >IntegralTypes_t;

	typedef typename mpl::find_if<IntegralTypes_t,
		typename mpl::and_<
			typename mpl::less_equal<
				typename mpl::at_c<typename mpl::_1,0>::type,
					mpl::integral_c<long long,lMin> >,
			typename mpl::greater_equal<
				typename mpl::at_c<typename mpl::_1,1>::type,
					mpl::integral_c<long long,lMax> > > >::type
						pIntegralType_t;

public:
	typedef typename mpl::at_c<typename mpl::deref<pIntegralType_t>::type,2>::type type;	
};

Leider klappt dies so nicht Bei der Instanzierung meckert der Compiler (VC++ bei dem Code "typename mpl::at_c<typename mpl::_1,1>" mit dem Fehler "
20>C:\Boost\include\boost-1_34_1\boost/mpl/next_prior.hpp(31) : error C2039: 'next' : is not a member of 'boost::mpl::void_'". "typename mpl::at_c<typename mpl::_1,0>" klappt dagegen wunderbar.

Was ist falsch?