Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2023. The current version is 1.89.0.
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 > { };