103 lines
2.2 KiB
C++
103 lines
2.2 KiB
C++
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// Copyright David Abrahams 2002.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BACK_REFERENCE_DWA2002510_HPP
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# define BACK_REFERENCE_DWA2002510_HPP
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# include <boost/python/detail/prefix.hpp>
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# include <boost/python/object_fwd.hpp>
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# include <boost/python/detail/dependent.hpp>
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# include <boost/python/detail/raw_pyobject.hpp>
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namespace boost { namespace python {
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template <class T>
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struct back_reference
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{
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private: // types
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typedef typename detail::dependent<object,T>::type source_t;
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public:
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typedef T type;
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back_reference(PyObject*, T);
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source_t const& source() const;
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T get() const;
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private:
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source_t m_source;
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T m_value;
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};
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# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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template<typename T>
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class is_back_reference
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{
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public:
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BOOST_STATIC_CONSTANT(bool, value = false);
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};
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template<typename T>
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class is_back_reference<back_reference<T> >
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{
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public:
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BOOST_STATIC_CONSTANT(bool, value = true);
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};
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# else // no partial specialization
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}} // namespace boost::python
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#include <boost/type.hpp>
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namespace boost { namespace python {
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namespace detail
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{
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typedef char (&yes_back_reference_t)[1];
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typedef char (&no_back_reference_t)[2];
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no_back_reference_t is_back_reference_test(...);
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template<typename T>
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yes_back_reference_t is_back_reference_test(boost::type< back_reference<T> >);
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}
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template<typename T>
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class is_back_reference
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{
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public:
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BOOST_STATIC_CONSTANT(
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bool, value = (
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sizeof(detail::is_back_reference_test(boost::type<T>()))
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== sizeof(detail::yes_back_reference_t)));
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};
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# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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//
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// implementations
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//
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template <class T>
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back_reference<T>::back_reference(PyObject* p, T x)
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: m_source(detail::borrowed_reference(p))
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, m_value(x)
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{
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}
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template <class T>
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typename back_reference<T>::source_t const& back_reference<T>::source() const
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{
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return m_source;
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}
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template <class T>
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T back_reference<T>::get() const
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{
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return m_value;
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}
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}} // namespace boost::python
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#endif // BACK_REFERENCE_DWA2002510_HPP
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