Boost C++ Libraries

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value_of_data

Description

Returns the type of the data property associated with the element referenced by an associative iterator references.

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

Table 1.21. Parameters

Parameter

Requirement

Description

I

Model of Associative Iterator

Operation's argument


Expression Semantics
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.

Header
#include <boost/fusion/iterator/value_of_data.hpp>
#include <boost/fusion/include/value_of_data.hpp>
Example
typedef map<pair<float,int> > vec;
typedef result_of::begin<vec>::type first;

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

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