Re: [Boost-users] [serialization] conditional serialization of membersand base classes

From: Robert Ramey (ramey_at_[hidden])
Date: 2007-02-22 23:39:46

n.torrey.pines wrote:
> Hi
>
> I'm not actually worried about throwing the rest of the archive out of
> sync, because the whole file will contain only one instance of "b".
> When b::m_a does not match what's in the archive, I'll just give up on
> loading and close the file.
>
> However, I'm worried about other issues, like the ones mentioned in
> the tutorial under "Derived Classes": versioning problems, etc. Can I
> serialize with boost::serialization::base_object and deserialize with
> "&" ?
>

>>> Now, what if b is derived from a instead of containing it? Would
>>> this work?
>>>
>>> class b : public a {
>>>     vector<int> m_v; // other data
>>>
>>>     template<class Archive>
>>>     void save(Archive& ar, const unsigned version) const {
>>>         ar & boost::serialization::base_object<a>(*this);
>>>         ar & m_v;
>>>     }
>>>
>>>     template<class Archive>
>>>     void load(Archive& ar, const unsigned version) {
>>>         a tmp;
>>>         ar & tmp;
>>>         if(tmp == static_cast< const a& >(*this)) ar & m_v;
                   throw ??? // abort serialization
>>>     }
>>>
>>>     // ...
>>> };

I would expect the above to do what  think you want.

Robert Ramey