[boost] serialization: automatic undo/redo

From: Li Lirong (lirong_at_[hidden])
Date: 2004-01-03 03:32:28

I'm trying to use the serialization library to implement the undo/redo 
functionality.  Basically, the idea is like this:

Object* pObject;
redo_archive ar;

// create the object...

// before modify the object, save it first.
ar << pObject;

// modify the object...

// undo the modification from the archive
ar >> pObject;

The problem is that after the undo, pObject will point to a newly 
created object instead of the originally. (The same applies some pointer 
fields of the object.)

Any quick solution? (Maybe, when loading a pointer, the library will not 
create a new object if the pointer is not equal to 0?)

Regards,
Lirong