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

Revision 857, 1.3 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 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
14namespace boost { namespace python {
15
16namespace detail
17{
18  template <class R>
19  struct reference_existing_object_requires_a_pointer_or_reference_return_type
20# if defined(__GNUC__) && __GNUC__ >= 3 || defined(__EDG__)
21  {}
22# endif
23  ;
24}
25
26template <class T> struct to_python_value;
27
28struct 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
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