Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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deref_data

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));