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Returns a type convertible to bool that evaluates to true if the sequence is empty, else, evaluates to false.

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template <typename Sequence>
typename result_of::empty<Sequence>::type
empty(Sequence const& seq);

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empty(seq);

Return type: Convertible to bool.

Semantics: Evaluates to true if the sequence is empty, else, evaluates to false.

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

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vector<int, int, int> v(1, 2, 3);
assert(empty(v) == false);