Chris@16: // Copyright David Abrahams 2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef DEFAULT_CALL_POLICIES_DWA2002131_HPP
Chris@16: # define DEFAULT_CALL_POLICIES_DWA2002131_HPP
Chris@16: 
Chris@16: # include <boost/python/detail/prefix.hpp>
Chris@16: # include <boost/mpl/if.hpp>
Chris@16: # include <boost/python/to_python_value.hpp>
Chris@16: # include <boost/python/detail/value_arg.hpp>
Chris@16: # include <boost/type_traits/transform_traits.hpp>
Chris@16: # include <boost/type_traits/is_pointer.hpp>
Chris@16: # include <boost/type_traits/is_reference.hpp>
Chris@16: # include <boost/mpl/or.hpp>
Chris@16: # include <boost/mpl/front.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { 
Chris@16: 
Chris@16: template <class T> struct to_python_value;
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16: // for "readable" error messages
Chris@16:   template <class T> struct specify_a_return_value_policy_to_wrap_functions_returning
Chris@16: # if defined(__GNUC__) && __GNUC__ >= 3 || defined(__EDG__)
Chris@16:   {}
Chris@16: # endif 
Chris@16:   ;
Chris@16: }
Chris@16: 
Chris@16: struct default_result_converter;
Chris@16: 
Chris@16: struct default_call_policies
Chris@16: {
Chris@16:     // Ownership of this argument tuple will ultimately be adopted by
Chris@16:     // the caller.
Chris@16:     template <class ArgumentPackage>
Chris@16:     static bool precall(ArgumentPackage const&)
Chris@16:     {
Chris@16:         return true;
Chris@16:     }
Chris@16: 
Chris@16:     // Pass the result through
Chris@16:     template <class ArgumentPackage>
Chris@16:     static PyObject* postcall(ArgumentPackage const&, PyObject* result)
Chris@16:     {
Chris@16:         return result;
Chris@16:     }
Chris@16: 
Chris@16:     typedef default_result_converter result_converter;
Chris@16:     typedef PyObject* argument_package;
Chris@16: 
Chris@16:     template <class Sig> 
Chris@16:     struct extract_return_type : mpl::front<Sig>
Chris@16:     {
Chris@16:     };
Chris@16: 
Chris@16: };
Chris@16: 
Chris@16: struct default_result_converter
Chris@16: {
Chris@16:     template <class R>
Chris@16:     struct apply
Chris@16:     {
Chris@16:         typedef typename mpl::if_<
Chris@16:             mpl::or_<is_pointer<R>, is_reference<R> >
Chris@16:           , detail::specify_a_return_value_policy_to_wrap_functions_returning<R>
Chris@16:           , boost::python::to_python_value<
Chris@16:                 typename detail::value_arg<R>::type
Chris@16:             >
Chris@16:         >::type type;
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: // Exceptions for c strings an PyObject*s
Chris@16: template <>
Chris@16: struct default_result_converter::apply<char const*>
Chris@16: {
Chris@16:     typedef boost::python::to_python_value<char const*const&> type;
Chris@16: };
Chris@16: 
Chris@16: template <>
Chris@16: struct default_result_converter::apply<PyObject*>
Chris@16: {
Chris@16:     typedef boost::python::to_python_value<PyObject*const&> type;
Chris@16: };
Chris@16: 
Chris@16: }} // namespace boost::python
Chris@16: 
Chris@16: #endif // DEFAULT_CALL_POLICIES_DWA2002131_HPP