// 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 |