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// 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__) || 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