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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__) && __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
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