[Boost-users] [units] meta_multiply units?

Hello, I cannot seem to figure out how to make a composite unit out of two existing units from the same system. For example, say I have a functor F which takes an argument of type F::arg_type = quantity<time> and returns a value of type F::ret_type = quantity<velocity> Now I want to write an integration function, which should return the correct type, something like template<class F> F::ret_type*F::arg_type // only conceptually integrate(F& f, typename F::arg_type a, typename F::arg_type b); so instantiating this with the above functor should produce a return type quantity. How can I combine F::arg_type and F::ret_type to produce the correct return type for the function template? Thank you, Rupert -- Rupert Mazzucco Research Scholar, Evolution and Ecology Program IIASA - Institute for Applied Systems Analysis Schlossplatz 1, 2361 Laxenburg, Austria Phone: +43 2236 807 522 Fax: +43 2236 713 13