[Boost-users] Serialization of derived classes with boost 1.34.1

From: Hansi (hansipet_at_[hidden])
Date: 2008-08-21 06:01:44

Hello,

I have a problem to serialize a derived class.
In some classes I use a shared_ptr<A> which acts as a interface for some 
other classes.

Til now I had the implementation in the header and it worked fine with the
BOOST_CLASS_EXPORT(B)
declaration after at the end of the header file where B was defined.

For performance reason (compile time) I have moved the serialization 
code from the header file (there is only the declaration) to the .cpp 
file (now I use also only the polymorphic_binary_archive). There I have 
also the declaration for the polymorphic_binary_archive

template void B::serialize(boost::archive::polymorphic_iarchive& ar, 
const  unsigned int file_version);
template void B::serialize(boost::archive::polymorphic_oarchive& ar, 
const unsigned int file_version);

After linking I have now some linker errors. First for the class B which 
is derived from A and for the class A. All linker errors use the 
binary_archive.

If I declare the "BOOST_CLASS_EXPORT(B)" at the end in the .cpp file I 
get only an linker error for class A.
How I can solve this?

Best regards
Hansjörg