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            Returns the result type of at[7].
          
template< typename Seq, typename M> struct at { typedef unspecified type; };
Table 1.28. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Random Access Sequence | Argument sequence | 
| 
                       | Index of element | 
result_of::at<Seq, M>::type
Return type: Any type.
            Precondition: 0
            <= M::value <  (where result_of::size<Seq>::valueSeq
            is not Unbounded
            Sequence)
          
            Semantics: Returns the result type of
            using at to access the Mth element of Seq.
          
#include <boost/fusion/sequence/intrinsic/at.hpp> #include <boost/fusion/include/at.hpp>
typedefvector<int,float,char> vec; BOOST_MPL_ASSERT((boost::is_same<result_of::at<vec, boost::mpl::int_<1> >::type, float&>));
[7] 
              result_of::at reflects the actual return
              type of the function at. Sequence(s)
              typically return references to its elements via the at function. If you want to
              get the actual element type, use result_of::value_at