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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 DEFAULT_CALL_POLICIES_DWA2002131_HPP | |
6 | # define DEFAULT_CALL_POLICIES_DWA2002131_HPP | |
7 | ||
8 | # include <boost/python/detail/prefix.hpp> | |
9 | # include <boost/mpl/if.hpp> | |
10 | # include <boost/python/to_python_value.hpp> | |
11 | # include <boost/python/detail/value_arg.hpp> | |
12 | # include <boost/type_traits/transform_traits.hpp> | |
13 | # include <boost/type_traits/is_pointer.hpp> | |
14 | # include <boost/type_traits/is_reference.hpp> | |
15 | # include <boost/mpl/or.hpp> | |
16 | # include <boost/mpl/front.hpp> | |
17 | ||
18 | namespace boost { namespace python { | |
19 | ||
20 | template <class T> struct to_python_value; | |
21 | ||
22 | namespace detail | |
23 | { | |
24 | // for "readable" error messages | |
25 | template <class T> struct specify_a_return_value_policy_to_wrap_functions_returning | |
26 | # if defined(__GNUC__) || defined(__EDG__) | |
27 | {} | |
28 | # endif | |
29 | ; | |
30 | } | |
31 | ||
32 | struct default_result_converter; | |
33 | ||
34 | struct default_call_policies | |
35 | { | |
36 | // Ownership of this argument tuple will ultimately be adopted by | |
37 | // the caller. | |
38 | template <class ArgumentPackage> | |
39 | static bool precall(ArgumentPackage const&) | |
40 | { | |
41 | return true; | |
42 | } | |
43 | ||
44 | // Pass the result through | |
45 | template <class ArgumentPackage> | |
46 | static PyObject* postcall(ArgumentPackage const&, PyObject* result) | |
47 | { | |
48 | return result; | |
49 | } | |
50 | ||
51 | typedef default_result_converter result_converter; | |
52 | typedef PyObject* argument_package; | |
53 | ||
54 | template <class Sig> | |
55 | struct extract_return_type : mpl::front<Sig> | |
56 | { | |
57 | }; | |
58 | ||
59 | }; | |
60 | ||
61 | struct default_result_converter | |
62 | { | |
63 | template <class R> | |
64 | struct apply | |
65 | { | |
66 | typedef typename mpl::if_< | |
67 | mpl::or_<is_pointer<R>, is_reference<R> > | |
68 | , detail::specify_a_return_value_policy_to_wrap_functions_returning<R> | |
69 | , boost::python::to_python_value< | |
70 | typename detail::value_arg<R>::type | |
71 | > | |
72 | >::type type; | |
73 | }; | |
74 | }; | |
75 | ||
76 | // Exceptions for c strings an PyObject*s | |
77 | template <> | |
78 | struct default_result_converter::apply<char const*> | |
79 | { | |
80 | typedef boost::python::to_python_value<char const*const&> type; | |
81 | }; | |
82 | ||
83 | template <> | |
84 | struct default_result_converter::apply<PyObject*> | |
85 | { | |
86 | typedef boost::python::to_python_value<PyObject*const&> type; | |
87 | }; | |
88 | ||
89 | }} // namespace boost::python | |
90 | ||
91 | #endif // DEFAULT_CALL_POLICIES_DWA2002131_HPP |