79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
// 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 MAKE_INSTANCE_DWA200296_HPP
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# define MAKE_INSTANCE_DWA200296_HPP
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# include <boost/python/detail/prefix.hpp>
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# include <boost/python/object/instance.hpp>
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# include <boost/python/converter/registered.hpp>
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# include <boost/python/detail/decref_guard.hpp>
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# include <boost/python/detail/none.hpp>
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# include <boost/mpl/assert.hpp>
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# include <boost/mpl/or.hpp>
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# include <boost/type_traits/is_union.hpp>
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namespace boost { namespace python { namespace objects {
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template <class T, class Holder, class Derived>
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struct make_instance_impl
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{
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typedef objects::instance<Holder> instance_t;
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template <class Arg>
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static inline PyObject* execute(Arg& x)
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{
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BOOST_MPL_ASSERT((mpl::or_<is_class<T>, is_union<T> >));
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PyTypeObject* type = Derived::get_class_object(x);
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if (type == 0)
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return python::detail::none();
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PyObject* raw_result = type->tp_alloc(
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type, objects::additional_instance_size<Holder>::value);
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if (raw_result != 0)
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{
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python::detail::decref_guard protect(raw_result);
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instance_t* instance = (instance_t*)raw_result;
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// construct the new C++ object and install the pointer
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// in the Python object.
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Derived::construct(&instance->storage, (PyObject*)instance, x)->install(raw_result);
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// Note the position of the internally-stored Holder,
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// for the sake of destruction
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Py_SIZE(instance) = offsetof(instance_t, storage);
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// Release ownership of the python object
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protect.cancel();
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}
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return raw_result;
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}
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};
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template <class T, class Holder>
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struct make_instance
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: make_instance_impl<T, Holder, make_instance<T,Holder> >
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{
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template <class U>
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static inline PyTypeObject* get_class_object(U&)
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{
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return converter::registered<T>::converters.get_class_object();
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}
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static inline Holder* construct(void* storage, PyObject* instance, reference_wrapper<T const> x)
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{
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return new (storage) Holder(instance, x);
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}
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};
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}}} // namespace boost::python::object
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#endif // MAKE_INSTANCE_DWA200296_HPP
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