...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< plus_action >, boost::units::absolute< Y >, Y>
// In header: <boost/units/lambda.hpp> template<typename Y> struct plain_return_type_2<arithmetic_action< plus_action >, boost::units::absolute< Y >, Y> { // types typedef boost::units::absolute< Y > type; };