...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::nfp::param_type — param_type
// 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 > { };