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#### deref_data

###### Description

Returns the type that will be returned by dereferencing the data property referenced by an associative iterator.

###### Synopsis

    template<
        typename I
        >
    struct deref_data
    {
        typedef unspecified type;
    };

Table 1.21. Parameters

Parameter | Requirement | Description
--- | --- | ---
`I` | Model of Associative Iterator | Operation's argument

###### Expression Semantics

    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`.

###### Header

    #include <boost/fusion/iterator/deref_data.hpp>
    #include <boost/fusion/include/deref_data.hpp>

###### Example

    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));