C++11 Wrapper Pattern - via Herb Sutters talk

template class wrap {
private:
   T t; // wrapped object
   ::: // wrapper-specific state
public:
   wrap( T t_ = T{} ) : t{t_} { }
   template
   auto operator()( F f ) -> decltype(f(t)) { // strategy: take any code (!)
   // wrapper work
   auto ret = f(t); // pass the wrapped object to it
   // more wrapper work
   return ret; // and return the result
}

From Herbs talk : video link
                            Slides (Example above from page 9)