Boost C++ Libraries

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deref_data

Description

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

Synposis

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

Table 1.22. 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 <boosta/fusion/iterator/deref_data.hpp>
#include <boost/fusion/include/deref_data.hpp>

Example

typedef map<pair<float,int> > map;
typedef result_of::begin<vec>::type first;

BOOST_MPL_ASSERT((boost::is_same<result_of::deref_data<first>::type, int&>));