| 1 | // Copyright David Abrahams 2002. |
|---|---|
| 2 | // Distributed under the Boost Software License, Version 1.0. (See |
| 3 | // accompanying file LICENSE_1_0.txt or copy at |
| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
| 5 | #ifndef BACK_REFERENCE_DWA2002510_HPP |
| 6 | # define BACK_REFERENCE_DWA2002510_HPP |
| 7 | |
| 8 | # include <boost/python/detail/prefix.hpp> |
| 9 | |
| 10 | # include <boost/python/object_fwd.hpp> |
| 11 | # include <boost/python/detail/dependent.hpp> |
| 12 | # include <boost/python/detail/raw_pyobject.hpp> |
| 13 | |
| 14 | namespace boost { namespace python { |
| 15 | |
| 16 | template <class T> |
| 17 | struct back_reference |
| 18 | { |
| 19 | private: // types |
| 20 | typedef typename detail::dependent<object,T>::type source_t; |
| 21 | public: |
| 22 | typedef T type; |
| 23 | |
| 24 | back_reference(PyObject*, T); |
| 25 | source_t const& source() const; |
| 26 | T get() const; |
| 27 | private: |
| 28 | source_t m_source; |
| 29 | T m_value; |
| 30 | }; |
| 31 | |
| 32 | template<typename T> |
| 33 | class is_back_reference |
| 34 | { |
| 35 | public: |
| 36 | BOOST_STATIC_CONSTANT(bool, value = false); |
| 37 | }; |
| 38 | |
| 39 | template<typename T> |
| 40 | class is_back_reference<back_reference<T> > |
| 41 | { |
| 42 | public: |
| 43 | BOOST_STATIC_CONSTANT(bool, value = true); |
| 44 | }; |
| 45 | |
| 46 | |
| 47 | // |
| 48 | // implementations |
| 49 | // |
| 50 | template <class T> |
| 51 | back_reference<T>::back_reference(PyObject* p, T x) |
| 52 | : m_source(detail::borrowed_reference(p)) |
| 53 | , m_value(x) |
| 54 | { |
| 55 | } |
| 56 | |
| 57 | template <class T> |
| 58 | typename back_reference<T>::source_t const& back_reference<T>::source() const |
| 59 | { |
| 60 | return m_source; |
| 61 | } |
| 62 | |
| 63 | template <class T> |
| 64 | T back_reference<T>::get() const |
| 65 | { |
| 66 | return m_value; |
| 67 | } |
| 68 | |
| 69 | }} // namespace boost::python |
| 70 | |
| 71 | #endif // BACK_REFERENCE_DWA2002510_HPP |
| 72 |