31   function() : invoker (0) { }  in function()
32   function(const function& other) : invoker(0) {   in function()
33     if (other.invoker)  in function()
34       invoker = other.invoker->clone();  in function()
37   template<typename F> function(const F& f) : invoker(0) {  in function()
38     invoker = new functor_invoker<F, R, Args...>(f);  in function()
42     if (invoker)  in ~function()
43       delete invoker;  in ~function()
58     invoker_base<R, Args...>* tmp = invoker;   in swap()
59     invoker = other.invoker;   in swap()
60     other.invoker = tmp;  in swap()
64     return invoker->invoke(args...);  in operator ()()
68   invoker_base<R, Args...>* invoker;  member in function