Struct template valid_member_metafunction

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## Struct template valid_member_metafunction

boost::tti::valid_member_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.

## Synopsis

    // In header: <boost/tti/member_type.hpp>

    template<typename TTI_METAFUNCTION>
    struct valid_member_metafunction : public boost::mpl::not_< boost::is_same< TTI_METAFUNCTION::type, TTI_METAFUNCTION::boost_tti_marker_type > >
    {
    };

## Description

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.