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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 REFERENCE_EXISTING_OBJECT_DWA200222_HPP | |
6 | # define REFERENCE_EXISTING_OBJECT_DWA200222_HPP | |
7 | ||
8 | # include <boost/python/detail/prefix.hpp> | |
9 | # include <boost/python/detail/indirect_traits.hpp> | |
10 | # include <boost/mpl/if.hpp> | |
11 | # include <boost/python/to_python_indirect.hpp> | |
12 | # include <boost/type_traits/composite_traits.hpp> | |
13 | ||
14 | namespace boost { namespace python { | |
15 | ||
16 | namespace detail | |
17 | { | |
18 | template <class R> | |
19 | struct reference_existing_object_requires_a_pointer_or_reference_return_type | |
20 | # if defined(__GNUC__) || defined(__EDG__) | |
21 | {} | |
22 | # endif | |
23 | ; | |
24 | } | |
25 | ||
26 | template <class T> struct to_python_value; | |
27 | ||
28 | struct reference_existing_object | |
29 | { | |
30 | template <class T> | |
31 | struct apply | |
32 | { | |
33 | BOOST_STATIC_CONSTANT( | |
34 | bool, ok = is_pointer<T>::value || is_reference<T>::value); | |
35 | ||
36 | typedef typename mpl::if_c< | |
37 | ok | |
38 | , to_python_indirect<T, detail::make_reference_holder> | |
39 | , detail::reference_existing_object_requires_a_pointer_or_reference_return_type<T> | |
40 | >::type type; | |
41 | }; | |
42 | }; | |
43 | ||
44 | }} // namespace boost::python | |
45 | ||
46 | #endif // REFERENCE_EXISTING_OBJECT_DWA200222_HPP |