...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< divide_action >, X, boost::units::quantity< Unit, X >>
// In header: <boost/units/lambda.hpp> template<typename Unit, typename X> struct plain_return_type_2<arithmetic_action< divide_action >, X, boost::units::quantity< Unit, X >> { // types typedef boost::units::divide_typeof_helper< X, boost::units::quantity< Unit, X > >::type type; };