...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::lambda::plain_return_type_2<arithmetic_action< multiply_action >, Y, boost::units::unit< Dim, System >>
// In header: <boost/units/lambda.hpp> template<typename System, typename Dim, typename Y> struct plain_return_type_2<arithmetic_action< multiply_action >, Y, boost::units::unit< Dim, System >> { // types typedef boost::units::multiply_typeof_helper< Y, boost::units::unit< Dim, System > >::type type; };