Re: [Boost-users] How can we serialize pointer of type baseabstractclass pointing to Derived concrete class

From: Alan Afif (alan.afif_at_[hidden])
Date: 2007-01-18 04:29:42

Jeff Flinn <TriumphSprint2000 <at> hotmail.com> writes:

> 
> 
> Piyush,
> Â 
> Could you post in plain text please. It's difficult 
> to avoid top positing otherwise.
> Â 
> 
> > I could not find any documents for Reference >> 
> Pointers >> Pointers to Objects of Derived Classes ??
> > Can you please send html link, thanks
> http://www.boost.org/libs/serialization/doc/index.html
> Will get you to the serialization docs. This looks like it changed since I 
> first responded. There is a tree on the left side. Expand Reference >> 
> Serializable Concept >> Pointers >> Pointers to Objects of Derived 
> Classes to get to the pertinent section. The html organization and/or 
Internet 
> Explorer are not allowing me to easily get you a more detailed link.
> Jeff Flinn
> 
> Â 
> Â 
> Â 
> 
> 
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Piyush

I have had the same problem using a polymorphic collection of boost shared 
pointers. The collection contains (boost shared) pointers to the abstract base 
class which point to derived concrete classes. I use boost version 1.32 and 
MSVC version 7.

At first I included the macro BOOST_CLASS_EXPORT_GUID for each derived concrete 
class. Tracing through with the debugger, I saw that although the derived 
concrete class was being serialized, an unregistered class exception was being 
thrown subsequently when boost tried to serialize the reference count part of 
the shared pointer itself. This is a structure which, it turns out, also needs 
to be registered.

The solution was to use the macro BOOST_SHARED_POINTER_EXPORT instead of the 
previous macro. This correctly serializes both the object and the shared 
pointer to the object.

I hope this helps you.

Regards

Alan Afif