author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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permissions | -rw-r--r-- |
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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 HANDLE_DWA200269_HPP |
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# define HANDLE_DWA200269_HPP |
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# include <boost/python/detail/prefix.hpp> |
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# include <boost/python/cast.hpp> |
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# include <boost/python/errors.hpp> |
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# include <boost/python/borrowed.hpp> |
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# include <boost/python/handle_fwd.hpp> |
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# include <boost/python/refcount.hpp> |
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# include <boost/python/tag.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> struct null_ok; |
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template <class T> |
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inline null_ok<T>* allow_null(T* p) |
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{ |
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return (null_ok<T>*)p; |
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} |
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namespace detail |
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{ |
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template <class T> |
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inline T* manage_ptr(detail::borrowed<null_ok<T> >* p, int) |
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{ |
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return python::xincref((T*)p); |
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} |
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template <class T> |
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inline T* manage_ptr(null_ok<detail::borrowed<T> >* p, int) |
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{ |
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return python::xincref((T*)p); |
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} |
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template <class T> |
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inline T* manage_ptr(detail::borrowed<T>* p, long) |
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{ |
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return python::incref(expect_non_null((T*)p)); |
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} |
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template <class T> |
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inline T* manage_ptr(null_ok<T>* p, long) |
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{ |
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return (T*)p; |
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} |
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template <class T> |
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inline T* manage_ptr(T* p, ...) |
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{ |
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return expect_non_null(p); |
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} |
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} |
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template <class T> |
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class handle |
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{ |
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typedef T* (handle::* bool_type )() const; |
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public: // types |
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typedef T element_type; |
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public: // member functions |
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handle(); |
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~handle(); |
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template <class Y> |
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explicit handle(Y* p) |
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: m_p( |
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python::upcast<T>( |
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detail::manage_ptr(p, 0) |
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) |
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) |
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{ |
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} |
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handle& operator=(handle const& r) |
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{ |
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python::xdecref(m_p); |
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m_p = python::xincref(r.m_p); |
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return *this; |
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} |
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#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300) |
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template<typename Y> |
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handle& operator=(handle<Y> const & r) // never throws |
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{ |
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python::xdecref(m_p); |
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m_p = python::xincref(python::upcast<T>(r.get())); |
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return *this; |
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} |
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#endif |
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template <typename Y> |
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handle(handle<Y> const& r) |
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: m_p(python::xincref(python::upcast<T>(r.get()))) |
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{ |
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} |
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handle(handle const& r) |
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: m_p(python::xincref(r.m_p)) |
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{ |
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} |
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T* operator-> () const; |
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T& operator* () const; |
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T* get() const; |
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T* release(); |
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void reset(); |
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operator bool_type() const // never throws |
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{ |
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return m_p ? &handle<T>::get : 0; |
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} |
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bool operator! () const; // never throws |
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public: // implementation details -- do not touch |
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// Defining this in the class body suppresses a VC7 link failure |
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inline handle(detail::borrowed_reference x) |
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: m_p( |
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python::incref( |
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downcast<T>((PyObject*)x) |
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)) |
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{ |
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} |
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private: // data members |
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T* m_p; |
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}; |
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#ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP |
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} // namespace python |
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#endif |
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template<class T> inline T * get_pointer(python::handle<T> const & p) |
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{ |
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return p.get(); |
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} |
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#ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP |
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namespace python { |
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#else |
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// We don't want get_pointer above to hide the others |
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using boost::get_pointer; |
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#endif |
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typedef handle<PyTypeObject> type_handle; |
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// |
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// Compile-time introspection |
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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_handle |
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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_handle<handle<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 |
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namespace detail |
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{ |
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typedef char (&yes_handle_t)[1]; |
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typedef char (&no_handle_t)[2]; |
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no_handle_t is_handle_test(...); |
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template<typename T> |
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yes_handle_t is_handle_test(boost::type< handle<T> >); |
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} |
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template<typename T> |
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class is_handle |
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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_handle_test(boost::type<T>())) |
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== sizeof(detail::yes_handle_t))); |
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}; |
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# endif |
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// |
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// implementations |
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// |
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template <class T> |
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inline handle<T>::handle() |
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: m_p(0) |
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{ |
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} |
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template <class T> |
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inline handle<T>::~handle() |
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{ |
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python::xdecref(m_p); |
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} |
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template <class T> |
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inline T* handle<T>::operator->() const |
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{ |
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return m_p; |
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} |
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template <class T> |
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inline T& handle<T>::operator*() const |
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return *m_p; |
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} |
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template <class T> |
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inline T* handle<T>::get() const |
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return m_p; |
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} |
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template <class T> |
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inline bool handle<T>::operator!() const |
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return m_p == 0; |
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} |
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template <class T> |
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inline T* handle<T>::release() |
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{ |
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T* result = m_p; |
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m_p = 0; |
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return result; |
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} |
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template <class T> |
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inline void handle<T>::reset() |
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{ |
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python::xdecref(m_p); |
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m_p = 0; |
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} |
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// Because get_managed_object must return a non-null PyObject*, we |
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// return Py_None if the handle is null. |
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template <class T> |
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inline PyObject* get_managed_object(handle<T> const& h, tag_t) |
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return h.get() ? python::upcast<PyObject>(h.get()) : Py_None; |
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} |
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}} // namespace boost::python |
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#endif // HANDLE_DWA200269_HPP |