source: NonGTP/Boost/boost/python/to_python_value.hpp @ 857

Revision 857, 3.6 KB checked in by igarcia, 19 years ago (diff)
RevLine 
[857]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 TO_PYTHON_VALUE_DWA200221_HPP
6# define TO_PYTHON_VALUE_DWA200221_HPP
7
8# include <boost/python/detail/prefix.hpp>
9
10# include <boost/python/refcount.hpp>
11# include <boost/python/tag.hpp>
12
13# include <boost/python/converter/registry.hpp>
14# include <boost/python/converter/registered.hpp>
15# include <boost/python/converter/builtin_converters.hpp>
16# include <boost/python/converter/object_manager.hpp>
17# include <boost/python/converter/object_manager.hpp>
18# include <boost/python/converter/shared_ptr_to_python.hpp>
19
20# include <boost/python/detail/value_is_shared_ptr.hpp>
21# include <boost/python/detail/value_arg.hpp>
22
23# include <boost/type_traits/transform_traits.hpp>
24
25# include <boost/mpl/if.hpp>
26# include <boost/mpl/or.hpp>
27
28namespace boost { namespace python {
29
30namespace detail
31{
32  template <class T>
33  struct object_manager_to_python_value
34  {
35      typedef typename value_arg<T>::type argument_type;
36   
37      PyObject* operator()(argument_type) const;
38
39      // This information helps make_getter() decide whether to try to
40      // return an internal reference or not. I don't like it much,
41      // but it will have to serve for now.
42      BOOST_STATIC_CONSTANT(bool, uses_registry = false);
43  };
44
45 
46  template <class T>
47  struct registry_to_python_value
48  {
49      typedef typename value_arg<T>::type argument_type;
50   
51      PyObject* operator()(argument_type) const;
52
53      // This information helps make_getter() decide whether to try to
54      // return an internal reference or not. I don't like it much,
55      // but it will have to serve for now.
56      BOOST_STATIC_CONSTANT(bool, uses_registry = true);
57  };
58
59  template <class T>
60  struct shared_ptr_to_python_value
61  {
62      typedef typename value_arg<T>::type argument_type;
63   
64      PyObject* operator()(argument_type) const;
65
66      // This information helps make_getter() decide whether to try to
67      // return an internal reference or not. I don't like it much,
68      // but it will have to serve for now.
69      BOOST_STATIC_CONSTANT(bool, uses_registry = false);
70  };
71}
72
73template <class T>
74struct to_python_value
75    : mpl::if_<
76          detail::value_is_shared_ptr<T>
77        , detail::shared_ptr_to_python_value<T>
78        , typename mpl::if_<
79              mpl::or_<
80                  converter::is_object_manager<T>
81                , converter::is_reference_to_object_manager<T>
82              >
83            , detail::object_manager_to_python_value<T>
84            , detail::registry_to_python_value<T>
85          >::type
86      >::type
87{
88};
89
90//
91// implementation
92//
93namespace detail
94{
95  template <class T>
96  inline PyObject* registry_to_python_value<T>::operator()(argument_type x) const
97  {
98      typedef converter::registered<argument_type> r;
99# if BOOST_WORKAROUND(__GNUC__, < 3)
100      // suppresses an ICE, somehow
101      (void)r::converters;
102# endif
103      return converter::registered<argument_type>::converters.to_python(&x);
104  }
105
106  template <class T>
107  inline PyObject* object_manager_to_python_value<T>::operator()(argument_type x) const
108  {
109      return python::upcast<PyObject>(
110          python::xincref(
111              get_managed_object(x, tag))
112          );
113  }
114
115  template <class T>
116  inline PyObject* shared_ptr_to_python_value<T>::operator()(argument_type x) const
117  {
118      return converter::shared_ptr_to_python(x);
119  }
120}
121
122}} // namespace boost::python
123
124#endif // TO_PYTHON_VALUE_DWA200221_HPP
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