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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 1.21. 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>));