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// 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;
};
# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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);
};
# else // no partial specialization
}} // namespace boost::python
#include <boost/type.hpp>
namespace boost { namespace python {
namespace detail
{
typedef char (&yes_back_reference_t)[1];
typedef char (&no_back_reference_t)[2];
no_back_reference_t is_back_reference_test(...);
template<typename T>
yes_back_reference_t is_back_reference_test(boost::type< back_reference<T> >);
}
template<typename T>
class is_back_reference
{
public:
BOOST_STATIC_CONSTANT(
bool, value = (
sizeof(detail::is_back_reference_test(boost::type<T>()))
== sizeof(detail::yes_back_reference_t)));
};
# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
//
// 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
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