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Returns a type convertible to bool that evaluates to true if the sequence contains an element associated with a Key, else, evaluates to false.

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template <typename Key, typename Sequence>
typename result_of::has_key<Sequence, Key>::type
has_key(Sequence const& seq);

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has_key<Key>(seq);

Return type: Convertible to bool.

Semantics: Evaluates to true if the sequence contains an element associated with Key, else, evaluates to false.

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

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set<int, char, bool> s(1, 'x', true);
assert(has_key<char>(s) == true);