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            Returns the result type of empty.
          
template<typename Seq> struct empty { typedef unspecified type; };
Table 1.24. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Forward Sequence | Argument sequence | 
result_of::empty<Seq>::type
Return type: An MPL Integral Constant
            Semantics: Returns mpl::true_
            if Seq has zero elements,
            mpl::false_ otherwise.
          
#include <boost/fusion/sequence/intrinsic/empty.hpp> #include <boost/fusion/include/empty.hpp>
typedefvector<> empty_vec; typedefvector<int,float,char> vec; BOOST_MPL_ASSERT((result_of::empty<empty_vec>)); BOOST_MPL_ASSERT_NOT((result_of::empty<vec>));