// Copyright David Abrahams 2002.

// 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)

#ifndef BACK_REFERENCE_DWA2002510_HPP

# define BACK_REFERENCE_DWA2002510_HPP

# include <boost/python/detail/prefix.hpp>

# include <boost/python/object_fwd.hpp>

# include <boost/python/detail/dependent.hpp>

# include <boost/python/detail/raw_pyobject.hpp>

namespace boost { namespace python {

template <class T>

struct back_reference

{

private: // types

typedef typename detail::dependent<object,T>::type source_t;

public:

typedef T type;

back_reference(PyObject*, T);

source_t const& source() const;

T get() const;

private:

source_t m_source;

T m_value;

};

template<typename T>

class is_back_reference

{

public:

BOOST_STATIC_CONSTANT(bool, value = false);

};

template<typename T>

class is_back_reference<back_reference<T> >

{

public:

BOOST_STATIC_CONSTANT(bool, value = true);

};

//

// implementations

//

template <class T>

back_reference<T>::back_reference(PyObject* p, T x)

: m_source(detail::borrowed_reference(p))

, m_value(x)

{

}

template <class T>

typename back_reference<T>::source_t const& back_reference<T>::source() const

{

return m_source;

}

template <class T>

T back_reference<T>::get() const

{

return m_value;

}

}} // namespace boost::python

#endif // BACK_REFERENCE_DWA2002510_HPP