: make_instance_impl<T, Holder, make_ptr_instance<T,Holder> >

{

template <class Arg>

static inline Holder* construct(void* storage, PyObject*, Arg& x)

{

#if defined(BOOST_NO_CXX11_SMART_PTR)

return new (storage) Holder(x);

#else

return new (storage) Holder(std::move(x));

#endif

}

template <class Ptr>

static inline PyTypeObject* get_class_object(Ptr const& x)

{

return get_class_object_impl(get_pointer(x));

}

#ifndef BOOST_PYTHON_NO_PY_SIGNATURES

static inline PyTypeObject const* get_pytype()

{

return converter::registered<T>::converters.get_class_object();

}

#endif

private:

template <class U>

static inline PyTypeObject* get_class_object_impl(U const volatile* p)

{

if (p == 0)

return 0; // means "return None".

PyTypeObject* derived = get_derived_class_object(

BOOST_DEDUCED_TYPENAME boost::python::detail::is_polymorphic<U>::type(), p);

if (derived)

return derived;

return converter::registered<T>::converters.get_class_object();

}

template <class U>

static inline PyTypeObject* get_derived_class_object(boost::python::detail::true_, U const volatile* x)

{

converter::registration const* r = converter::registry::query(

type_info(typeid(*x))

);

return r ? r->m_class_object : 0;

}

template <class U>

static inline PyTypeObject* get_derived_class_object(boost::python::detail::false_, U*)

{

return 0;

}