// 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