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Returns the type that will be returned by dereferencing the data property referenced by an associative iterator.
template< typename I > struct deref_data { typedef unspecified type; };
Table 1.21. Parameters
Parameter |
Requirement |
Description |
---|---|---|
|
Model of Associative Iterator |
Operation's argument |
result_of::deref_data
<I>::type
Return type: Any type
Semantics: Returns the result of dereferencing
the data property referenced by an associative iterator of type I
.
#include <boost/fusion/iterator/deref_data.hpp> #include <boost/fusion/include/deref_data.hpp>
typedef map<pair<float, int> > map_type; typedef boost::fusion::result_of::begin<map_type>::type i_type; typedef boost::fusion::result_of::deref_data<i_type>::type r_type; BOOST_STATIC_ASSERT((boost::is_same<r_type, int&>::value));