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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 |