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