Wrapping classes with pure virtual functions

[[EMAIL PROTECTED]]

Hi,
I'm having problems wrapping a hierarchy of classes, actually having
problems wrapping the base class. I don't need to use the WrapClass
mechanism since I don't want to override classes in Python. My code
boils down to:

class Base
{
public:
        virtual ~Base()
        {}

        virtual void f() = 0;
};

class Derived :
        public Base
{
public:
        virtual void f()
        {}

        void g()
        {}
};

int main()
{
        boost::python::class_<Base> class_base("Base");
        boost::python::class_<Derived> class_derived("Derived");
        return 0;
}

The first line inside main (the one exporting Base) is causing the
compile time error:
error C2259: 'Base' : cannot instantiate abstract class...
The probem seems to be that struct value_holder<Base> holds a Base
member instance by value, and this is not possible since Base can't be
instantiated.
I'm using Visual Studio 2005 and boost 1.33.1.
Thanks

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