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Struct template param_type

boost::nfp::param_type — param_type<Params,Keyword,Default>::type is the type of the parameter corresponding to the Keyword (if parameter is present) or Default


// In header: <boost/test/utils/named_params.hpp>

template<typename NP, typename Keyword, typename DefaultType = void> 
struct param_type : public mpl::if_< is_same< NP::id, Keyword::id >::type, remove_cv< NP::data_type >::type, DefaultType >