...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::eval::result<This(Expr, Context)>
// In header: <boost/proto/eval.hpp> template<typename This, typename Expr, typename Context> struct result<This(Expr, Context)> : proto::result_of::eval< typename boost::remove_reference< Expr >::type, typename boost::remove_reference< Context >::type > { };