[C++-sig] How to do inheritance in boost.python?

[michael kapelko]

I have this:

#include <boost/python.hpp>
#include <iostream>
using namespace boost::python;
using namespace std;

class Base {
    public:
        virtual ~Base() {

        }
        virtual int f() = 0;
};

class BaseWrap: public Base, public wrapper<Base> {
    public:
        int f() {
            return this->get_override("f")();
        }
};

BOOST_PYTHON_MODULE(hello) {
    class_<BaseWrap, boost::noncopyable>("Base")
        .def("f", pure_virtual(&Base::f))
    ;
}

Module compiles ok into hello.so.
But then I do in Python:

 >>> import hello
 >>> base = Base();
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'Base' is not defined
 >>> class Derived(Base):
...     def f(self):
...             return 42;
...
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'Base' is not defined

What's wrong with the code?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Also, here's a code with not pure virtual func:

#include <boost/python.hpp>
#include <iostream>
using namespace boost::python;
using namespace std;

class Base {
        public:
                virtual ~Base() {

                }
                virtual int f() {
                        return 0;
                }
};

class BaseWrap: public Base, public wrapper<Base> {
        public:
                int f() {
                        if (override f = this->get_override("f"))
                                return f();
                        return Base::f();
                }
                int default_f() {
                        return this->Base::f();
                }
};

BOOST_PYTHON_MODULE(hello) {
        class_<BaseWrap, boost::noncopyable>("Base")
                .def("f", &Base::f, &BaseWrap::default_f)
        ;
}

And in Python I get the same error that Base isn't defined.
Thanks.