| // Copyright David Abrahams 2002. |
| // Distributed under the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| #ifndef DEFAULT_CALL_POLICIES_DWA2002131_HPP |
| # define DEFAULT_CALL_POLICIES_DWA2002131_HPP |
| |
| # include <boost/python/detail/prefix.hpp> |
| # include <boost/mpl/if.hpp> |
| # include <boost/python/to_python_value.hpp> |
| # include <boost/python/detail/value_arg.hpp> |
| # include <boost/type_traits/transform_traits.hpp> |
| # include <boost/type_traits/is_pointer.hpp> |
| # include <boost/type_traits/is_reference.hpp> |
| # include <boost/mpl/or.hpp> |
| # include <boost/mpl/front.hpp> |
| |
| namespace boost { namespace python { |
| |
| template <class T> struct to_python_value; |
| |
| namespace detail |
| { |
| // for "readable" error messages |
| template <class T> struct specify_a_return_value_policy_to_wrap_functions_returning |
| # if defined(__GNUC__) && __GNUC__ >= 3 || defined(__EDG__) |
| {} |
| # endif |
| ; |
| } |
| |
| struct default_result_converter; |
| |
| struct default_call_policies |
| { |
| // Ownership of this argument tuple will ultimately be adopted by |
| // the caller. |
| template <class ArgumentPackage> |
| static bool precall(ArgumentPackage const&) |
| { |
| return true; |
| } |
| |
| // Pass the result through |
| template <class ArgumentPackage> |
| static PyObject* postcall(ArgumentPackage const&, PyObject* result) |
| { |
| return result; |
| } |
| |
| typedef default_result_converter result_converter; |
| typedef PyObject* argument_package; |
| |
| template <class Sig> |
| struct extract_return_type : mpl::front<Sig> |
| { |
| }; |
| |
| }; |
| |
| struct default_result_converter |
| { |
| template <class R> |
| struct apply |
| { |
| typedef typename mpl::if_< |
| mpl::or_<is_pointer<R>, is_reference<R> > |
| , detail::specify_a_return_value_policy_to_wrap_functions_returning<R> |
| , boost::python::to_python_value< |
| typename detail::value_arg<R>::type |
| > |
| >::type type; |
| }; |
| }; |
| |
| // Exceptions for c strings an PyObject*s |
| template <> |
| struct default_result_converter::apply<char const*> |
| { |
| typedef boost::python::to_python_value<char const*const&> type; |
| }; |
| |
| template <> |
| struct default_result_converter::apply<PyObject*> |
| { |
| typedef boost::python::to_python_value<PyObject*const&> type; |
| }; |
| |
| }} // namespace boost::python |
| |
| #endif // DEFAULT_CALL_POLICIES_DWA2002131_HPP |