| 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 |
| 92 |