[Boost-users] [Fusion] fusion::for_each with stateful functors

Hello Boost Users, More than three years ago this question arose in this list: http://lists.boost.org/boost-users/2007/03/26338.php And as I understand it was concluded that overload for non-const references should be added. But now there are only const references to functor available. Was it forgotten or there are some reasons not to have such overload? What is the best way to solve the problem? Mutable members or some proxies look quirky. Thanks!