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// Copyright David Abrahams 2006. Distributed under the Boost

// Software License, Version 1.0. (See accompanying

// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#include <boost/python.hpp>

#include <boost/enable_shared_from_this.hpp>

#include <boost/shared_ptr.hpp>

using namespace boost;

class A : public enable_shared_from_this<A> {

public:

A() : val(0) {};

int val;

typedef shared_ptr<A> A_ptr;

A_ptr self() {

A_ptr self;

self = shared_from_this();

return self;

}

};

class B {

public:

B() {

a = A::A_ptr(new A());

}

void set(A::A_ptr _a) {

this->a = _a;

}

A::A_ptr get() {

return a;

}

A::A_ptr a;

};

template <class T>

void hold_python(shared_ptr<T>& x)

{

x = python::extract<shared_ptr<T> >( python::object(x) );

}

A::A_ptr get_b_a(shared_ptr<B> b)

{

hold_python(b->a);

return b->get();

}

BOOST_PYTHON_MODULE(andreas_beyer_ext) {

python::class_<A, noncopyable> ("A")

.def("self", &A::self)

.def_readwrite("val", &A::val)

;

python::register_ptr_to_python< A::A_ptr >();

python::class_<B>("B")

.def("set", &B::set)

// .def("get", &B::get)

.def("get", get_b_a)

;

}