// 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 EXTRACT_DWA200265_HPP # define EXTRACT_DWA200265_HPP # include <boost/python/detail/prefix.hpp> # include <boost/python/converter/object_manager.hpp> # include <boost/python/converter/from_python.hpp> # include <boost/python/converter/rvalue_from_python_data.hpp> # include <boost/python/converter/registered.hpp> # include <boost/python/converter/registered_pointee.hpp> # include <boost/python/object_core.hpp> # include <boost/python/refcount.hpp> # include <boost/python/detail/copy_ctor_mutates_rhs.hpp> # include <boost/python/detail/void_ptr.hpp> # include <boost/python/detail/void_return.hpp> # include <boost/call_traits.hpp> #if BOOST_WORKAROUND(BOOST_INTEL_WIN, <= 900) # define BOOST_EXTRACT_WORKAROUND () #else # define BOOST_EXTRACT_WORKAROUND #endif namespace boost { namespace python { namespace api { class object; } namespace converter { template <class Ptr> struct extract_pointer { typedef Ptr result_type; extract_pointer(PyObject*); bool check() const; Ptr operator()() const; private: PyObject* m_source; void* m_result; }; template <class Ref> struct extract_reference { typedef Ref result_type; extract_reference(PyObject*); bool check() const; Ref operator()() const; private: PyObject* m_source; void* m_result; }; template <class T> struct extract_rvalue : private noncopyable { typedef typename mpl::if_< python::detail::copy_ctor_mutates_rhs<T> , T& , typename call_traits<T>::param_type >::type result_type; extract_rvalue(PyObject*); bool check() const; result_type operator()() const; private: PyObject* m_source; mutable rvalue_from_python_data<T> m_data; }; template <class T> struct extract_object_manager { typedef T result_type; extract_object_manager(PyObject*); bool check() const; result_type operator()() const; private: PyObject* m_source; }; template <class T> struct select_extract { BOOST_STATIC_CONSTANT( bool, obj_mgr = is_object_manager<T>::value); BOOST_STATIC_CONSTANT( bool, ptr = is_pointer<T>::value); BOOST_STATIC_CONSTANT( bool, ref = is_reference<T>::value); typedef typename mpl::if_c< obj_mgr , extract_object_manager<T> , typename mpl::if_c< ptr , extract_pointer<T> , typename mpl::if_c< ref , extract_reference<T> , extract_rvalue<T> >::type >::type >::type type; }; } template <class T> struct extract : converter::select_extract<T>::type { private: typedef typename converter::select_extract<T>::type base; public: typedef typename base::result_type result_type; operator result_type() const { return (*this)(); } extract(PyObject*); extract(api::object const&); }; // // Implementations // template <class T> inline extract<T>::extract(PyObject* o) : base(o) { } template <class T> inline extract<T>::extract(api::object const& o) : base(o.ptr()) { } namespace converter { template <class T> inline extract_rvalue<T>::extract_rvalue(PyObject* x) : m_source(x) , m_data( (rvalue_from_python_stage1)(x, registered<T>::converters) ) { } template <class T> inline bool extract_rvalue<T>::check() const { return m_data.stage1.convertible; } template <class T> inline typename extract_rvalue<T>::result_type extract_rvalue<T>::operator()() const { return *(T*)( // Only do the stage2 conversion once m_data.stage1.convertible == m_data.storage.bytes ? m_data.storage.bytes : (rvalue_from_python_stage2)(m_source, m_data.stage1, registered<T>::converters) ); } template <class Ref> inline extract_reference<Ref>::extract_reference(PyObject* obj) : m_source(obj) , m_result( (get_lvalue_from_python)(obj, registered<Ref>::converters) ) { } template <class Ref> inline bool extract_reference<Ref>::check() const { return m_result != 0; } template <class Ref> inline Ref extract_reference<Ref>::operator()() const { if (m_result == 0) (throw_no_reference_from_python)(m_source, registered<Ref>::converters); return python::detail::void_ptr_to_reference(m_result, (Ref(*)())0); } template <class Ptr> inline extract_pointer<Ptr>::extract_pointer(PyObject* obj) : m_source(obj) , m_result( obj == Py_None ? 0 : (get_lvalue_from_python)(obj, registered_pointee<Ptr>::converters) ) { } template <class Ptr> inline bool extract_pointer<Ptr>::check() const { return m_source == Py_None || m_result != 0; } template <class Ptr> inline Ptr extract_pointer<Ptr>::operator()() const { if (m_result == 0 && m_source != Py_None) (throw_no_pointer_from_python)(m_source, registered_pointee<Ptr>::converters); return Ptr(m_result); } template <class T> inline extract_object_manager<T>::extract_object_manager(PyObject* obj) : m_source(obj) { } template <class T> inline bool extract_object_manager<T>::check() const { return object_manager_traits<T>::check(m_source); } template <class T> inline T extract_object_manager<T>::operator()() const { return T( object_manager_traits<T>::adopt(python::incref(m_source)) ); } } }} // namespace boost::python::converter #endif // EXTRACT_DWA200265_HPP