empty

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Returns the result type of empty.

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template<typename Seq>
struct empty
{
    typedef unspecified type;
};

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Table 1.21. Parameters

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Table 1.21. Parameters

=======

Table 1.25. Parameters

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Table 1.25. Parameters

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Table 1.25. Parameters

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Table 1.25. Parameters

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Table 1.25. Parameters

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>>>>>>> .merge-right.r57125

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

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Expression =======

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

result_of::empty<Seq>::type

Return type: An MPL Integral Constant

Semantics: Returns mpl::true_ if Seq has zero elements, mpl::false_ otherwise.

Header

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

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typedef vector<> empty_vec;
typedef vector<int,float,char> vec;

BOOST_MPL_ASSERT((result_of::empty<empty_vec>));
BOOST_MPL_ASSERT_NOT((result_of::empty<vec>));