| // 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 |