value_at

value_at_key

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Returns the actual element type associated with a Key from the Sequence.

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template<
    typename Seq,
    typename Key>
struct value_at_key
{
    typedef unspecified type;
};

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Table 1.31. Parameters

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Table 1.31. Parameters

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Table 1.35. Parameters

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Table 1.35. Parameters

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Table 1.35. Parameters

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Table 1.35. Parameters

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Table 1.35. Parameters

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Parameter	Requirement	Description
`Seq`	A model of Forward Sequence	Argument sequence
`Key`	Any type	Key type

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Expression =======

Expression >>>>>>> .merge-right.r57125 Semantics

result_of::value_at_key<Seq, Key>::type

Return type: Any type.

Semantics: Returns the actual element type associated with key type Key in Seq.

Header

#include <boost/fusion/sequence/intrinsic/value_at_key.hpp>
#include <boost/fusion/include/value_at_key.hpp>

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typedef map<pair<int, char>, pair<char, char>, pair<double, char> > mymap;
BOOST_MPL_ASSERT((boost::is_same<result_of::at_key<mymap, int>::type, char>));