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Returns the result type of empty.
template<typename Seq> struct empty { typedef unspecified type; };
Table 1.21. Parameters
|
Parameter |
Requirement |
Description |
|---|---|---|
|
|
A model of Forward Sequence |
Argument sequence |
result_of::empty<Seq>::type
Return type: An MPL Integral Constant
Semantics: Returns mpl::true_
if Seq has zero elements,
mpl::false_ otherwise.
/sequence/intrinsic/empty.hpp>
typedefvector<> empty_vec; typedefvector<int,float,char> vec; BOOST_MPL_ASSERT((result_of::empty<empty_vec>)); BOOST_MPL_ASSERT_NOT((result_of::empty<vec>));