Re: [Boost-users] Serialization of static member variables?

From: Robert Ramey (ramey_at_[hidden])
Date: 2006-01-16 17:48:58

Objects that are tracked are tracked by address regardless of whether they 
are static variables or not.  So the answer to your question is Yes - static 
pointers will be serialized only once - providing they point to tracked 
types.

However, in your example, the static object isn't a pointer - its a static 
integer.  Given that default behavior for primitive types (including 
integers) is not tracked, multiple copies of j will be stored/loaded.

Robert Ramey

Joseph Turian wrote:
> Hi,
>
> If see from the serialization documentation that if I serialize a
> pointer more than once, only one instance will appear in the archive.
>
> However, what about static member variables?
> Will they only be serialized once, even if I serialize multiple
> objects of the class type?
>
> e.g.
>
> class foo {
> private:
>   int i;
>   static int j;
>
>   friend class boost::serialization::access;
>   template<class Archive> void serialize(Archive& ar, const unsigned
> int version) {
>      ar & i;
>      ar & j;    // Will j be serialized multiple times, i.e. once per
> foo instance?
>   }
> };
>
> Thanks,
>
>   Joseph