source: NonGTP/Boost/boost/python/object/make_ptr_instance.hpp @ 857

Revision 857, 2.0 KB checked in by igarcia, 19 years ago (diff)
Line 
1// Copyright David Abrahams 2002.
2// Distributed under the Boost Software License, Version 1.0. (See
3// accompanying file LICENSE_1_0.txt or copy at
4// http://www.boost.org/LICENSE_1_0.txt)
5#ifndef MAKE_PTR_INSTANCE_DWA200296_HPP
6# define MAKE_PTR_INSTANCE_DWA200296_HPP
7
8# include <boost/python/object/make_instance.hpp>
9# include <boost/python/converter/registry.hpp>
10# include <boost/type_traits/is_polymorphic.hpp>
11# include <boost/get_pointer.hpp>
12# include <boost/detail/workaround.hpp>
13# include <typeinfo>
14
15namespace boost { namespace python { namespace objects {
16
17template <class T, class Holder>
18struct make_ptr_instance
19    : make_instance_impl<T, Holder, make_ptr_instance<T,Holder> >
20{
21    template <class Arg>
22    static inline Holder* construct(void* storage, PyObject*, Arg& x)
23    {
24        return new (storage) Holder(x);
25    }
26   
27    template <class Ptr>
28    static inline PyTypeObject* get_class_object(Ptr const& x)
29    {
30        return get_class_object_impl(get_pointer(x));
31    }
32
33 private:
34    template <class U>
35    static inline PyTypeObject* get_class_object_impl(U const volatile* p)
36    {
37        if (p == 0)
38            return 0; // means "return None".
39
40        PyTypeObject* derived = get_derived_class_object(
41            BOOST_DEDUCED_TYPENAME is_polymorphic<U>::type(), p);
42       
43        if (derived)
44            return derived;
45        return converter::registered<T>::converters.get_class_object();
46    }
47   
48    template <class U>
49    static inline PyTypeObject* get_derived_class_object(mpl::true_, U const volatile* x)
50    {
51        converter::registration const* r = converter::registry::query(
52            type_info(typeid(*get_pointer(x)))
53        );
54        return r ? r->m_class_object : 0;
55    }
56   
57    template <class U>
58    static inline PyTypeObject* get_derived_class_object(mpl::false_, U*)
59    {
60        return 0;
61    }
62};
63 
64
65}}} // namespace boost::python::object
66
67#endif // MAKE_PTR_INSTANCE_DWA200296_HPP
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