...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::flatten::result<This(Expr)>
// In header: <boost/proto/fusion.hpp> template<typename This, typename Expr> struct result<This(Expr)> : result< This(Expr const &) > { };