[Boost-users] [serialization] Re-serialization ??

Is there a way to do a "re-serialization" of an object structure? Let's say I have a couple of objects, and I serialize them to "State A", then change a few things. Ideally, I'd like to just deserialize "State A" so that I get the objects back to that state, without boost::serialization creating new objects for me. Is it doable? (it is for an undo implementation) TIA /Rob