[857] | 1 | // Copyright David Abrahams 2002.
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See
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| 3 | // accompanying file LICENSE_1_0.txt or copy at
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| 4 | // http://www.boost.org/LICENSE_1_0.txt)
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| 5 | #ifndef BACK_REFERENCE_DWA2002510_HPP
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| 6 | # define BACK_REFERENCE_DWA2002510_HPP
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| 7 |
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| 8 | # include <boost/python/detail/prefix.hpp>
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| 9 |
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| 10 | # include <boost/python/object_fwd.hpp>
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| 11 | # include <boost/python/detail/dependent.hpp>
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| 12 | # include <boost/python/detail/raw_pyobject.hpp>
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| 13 |
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| 14 | namespace boost { namespace python {
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| 15 |
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| 16 | template <class T>
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| 17 | struct back_reference
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| 18 | {
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| 19 | private: // types
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| 20 | typedef typename detail::dependent<object,T>::type source_t;
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| 21 | public:
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| 22 | typedef T type;
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| 23 |
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| 24 | back_reference(PyObject*, T);
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| 25 | source_t const& source() const;
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| 26 | T get() const;
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| 27 | private:
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| 28 | source_t m_source;
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| 29 | T m_value;
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| 30 | };
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| 31 |
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| 32 | # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 33 | template<typename T>
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| 34 | class is_back_reference
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| 35 | {
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| 36 | public:
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| 37 | BOOST_STATIC_CONSTANT(bool, value = false);
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| 38 | };
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| 39 |
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| 40 | template<typename T>
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| 41 | class is_back_reference<back_reference<T> >
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| 42 | {
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| 43 | public:
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| 44 | BOOST_STATIC_CONSTANT(bool, value = true);
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| 45 | };
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| 46 |
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| 47 | # else // no partial specialization
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| 48 |
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| 49 | }} // namespace boost::python
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| 50 |
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| 51 | #include <boost/type.hpp>
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| 52 |
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| 53 | namespace boost { namespace python {
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| 54 |
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| 55 | namespace detail
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| 56 | {
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| 57 | typedef char (&yes_back_reference_t)[1];
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| 58 | typedef char (&no_back_reference_t)[2];
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| 59 |
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| 60 | no_back_reference_t is_back_reference_test(...);
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| 61 |
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| 62 | template<typename T>
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| 63 | yes_back_reference_t is_back_reference_test(boost::type< back_reference<T> >);
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| 64 | }
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| 65 |
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| 66 | template<typename T>
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| 67 | class is_back_reference
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| 68 | {
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| 69 | public:
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| 70 | BOOST_STATIC_CONSTANT(
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| 71 | bool, value = (
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| 72 | sizeof(detail::is_back_reference_test(boost::type<T>()))
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| 73 | == sizeof(detail::yes_back_reference_t)));
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| 74 | };
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| 75 |
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| 76 | # endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 77 |
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| 78 | //
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| 79 | // implementations
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| 80 | //
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| 81 | template <class T>
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| 82 | back_reference<T>::back_reference(PyObject* p, T x)
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| 83 | : m_source(detail::borrowed_reference(p))
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| 84 | , m_value(x)
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| 85 | {
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| 86 | }
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| 87 |
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| 88 | template <class T>
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| 89 | typename back_reference<T>::source_t const& back_reference<T>::source() const
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| 90 | {
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| 91 | return m_source;
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| 92 | }
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| 93 |
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| 94 | template <class T>
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| 95 | T back_reference<T>::get() const
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| 96 | {
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| 97 | return m_value;
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| 98 | }
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| 99 |
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| 100 | }} // namespace boost::python
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| 101 |
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| 102 | #endif // BACK_REFERENCE_DWA2002510_HPP
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