This makes no sense at all. A functor is a type class, it doesn't contain any state.
In C++, it makes sense: http://www.sgi.com/tech/stl/functors.html. Functors are function objects, which is to say they're a class/struct with one method, operator().
If this makes you sigh, know that you're not alone.
This makes no sense at all. A functor is a type class, it doesn't contain any state.