| // 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 REFERENCE_EXISTING_OBJECT_DWA200222_HPP |
| # define REFERENCE_EXISTING_OBJECT_DWA200222_HPP |
| |
| # include <boost/python/detail/prefix.hpp> |
| # include <boost/python/detail/indirect_traits.hpp> |
| # include <boost/mpl/if.hpp> |
| # include <boost/python/to_python_indirect.hpp> |
| # include <boost/type_traits/composite_traits.hpp> |
| |
| namespace boost { namespace python { |
| |
| namespace detail |
| { |
| template <class R> |
| struct reference_existing_object_requires_a_pointer_or_reference_return_type |
| # if defined(__GNUC__) && __GNUC__ >= 3 || defined(__EDG__) |
| {} |
| # endif |
| ; |
| } |
| |
| template <class T> struct to_python_value; |
| |
| struct reference_existing_object |
| { |
| template <class T> |
| struct apply |
| { |
| BOOST_STATIC_CONSTANT( |
| bool, ok = is_pointer<T>::value || is_reference<T>::value); |
| |
| typedef typename mpl::if_c< |
| ok |
| , to_python_indirect<T, detail::make_reference_holder> |
| , detail::reference_existing_object_requires_a_pointer_or_reference_return_type<T> |
| >::type type; |
| }; |
| }; |
| |
| }} // namespace boost::python |
| |
| #endif // REFERENCE_EXISTING_OBJECT_DWA200222_HPP |