...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::proto::functional::pop_back::result<This(Seq &)>
// In header: <boost/proto/functional/fusion/pop_back.hpp> template<typename This, typename Seq> struct result<This(Seq &)> : fusion::result_of::pop_back< Seq > { };