I've got a system where

class A
{
A();
A(const string&);
virtual ~A();
};

class C : public A
{
    C();
    C(const A&, float);
    virtual ~C();
};

BOOST_CLASS_EXPORT( A )
BOOST_CLASS_EXPORT( C )

main()
{

...

const A* a = new a("stuff");

const C* c = new c(*a, 52.54390f);

{

ofstream ofs("dump.bin");

boost::archive::text_oarchive oa(ofs);

oa<<a<<c;

}

...

A* a2=NULL;

C* c2=NULL;

try

{

        ifstream ifs("dump.bin");
        boost::archive::text_iarchive ia(ifs);
        ia>>a2;
        ia>>c2;

}

catch(boost::archive::archive_exception& ae)
{
cout<<ae.what();
}

}

This works just fine. If I replace

A* a2=NULL;

C* c2=NULL;

with

A* a2=NULL;

A* c2=NULL;

Then it throws an unregistered_class exception. If I change the iarchive to take:

const A* a = new A("I'm cool");
const A* c = new C(*a,54.2f);

then I can unarchive it with a pair of A*.

Is this by design? Seriously? I can't save derived pointers and unarchive base pointers?

Larry