[Boost-users] returning values in Boost.StateChart

I'm using statechart for a project and I'm trying to do the following without success. I want to get a new event for the statechart when an event is processed. I mean, call process_event with an event and get another event as a result. We tried with different approaches. For example, modifying the passed event (but it's const) and trying to do a custom reaction that returns something (but I had problems too.. don't remember exactly now). The solution for now was to call an interface that it is implemented in all the states.. so I have to do two calls, one for process_event and other for this interface that returns the new event.... and the question is... Is there a better way to do this? Thanks!