[Boost-users] [boost-users][multi-index] passing modifier by reference/pointer?

Hello, Is there a simple way to pass a modifier by reference/pointer in the following expression: my_multi_index_container.modify(somePos, modifier); "modifier" is a functor that has some internal state, so I wouldn't like it to be copied. Is it possible to do this without an explicit creation of a binder that binds operator() and &modifier (or so)? Thanks.