A metafunction which checks whether the invoked macro metafunction generated by BOOST_TTI_MEMBER_TYPE ( BOOST_TTI_TRAIT_MEMBER_TYPE ) hold a valid type.
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template<class TTI_METAFUNCTION>
struct boost::tti::valid_member_metafunction< TTI_METAFUNCTION >
A metafunction which checks whether the invoked macro metafunction generated by BOOST_TTI_MEMBER_TYPE ( BOOST_TTI_TRAIT_MEMBER_TYPE ) hold a valid type.
template<class TTI_METAFUNCTION> struct valid_member_metafunction { static const value = unspecified; typedef mpl::bool_<true-or-false> type; };
The metafunction types and return:
TTI_METAFUNCTION = The invoked macro metafunction generated by BOOST_TTI_MEMBER_TYPE ( BOOST_TTI_TRAIT_MEMBER_TYPE ).
returns = 'value' is true if the nested type of the invoked metafunction is valid, otherwise 'value' is false. A valid type means that the invoked metafunction's inner 'type' is not the marker type.