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Returns the type of the data property associated with the element referenced by an associative iterator references.
template< typename I > struct value_of_data { typedef unspecified type; };
Table 1.20. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                     | Model of Associative Iterator | Operation's argument | 
result_of::value_of_data<I>::type
Return type: Any type
          Semantics: Returns the type of the data
          property associated with the element referenced by an associative iterator
          I.
        
#include <boost/fusion/iterator/value_of_data.hpp> #include <boost/fusion/include/value_of_data.hpp>
typedefmap<pair<float,int> > vec; typedefresult_of::begin<vec>::type first; BOOST_MPL_ASSERT((boost::is_same<result_of::value_of_data<first>::type, int>));