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 REFERENCE_EXISTING_OBJECT_DWA200222_HPP
Chris@16: # define REFERENCE_EXISTING_OBJECT_DWA200222_HPP
Chris@16: 
Chris@16: # include <boost/python/detail/prefix.hpp>
Chris@16: # include <boost/python/detail/indirect_traits.hpp>
Chris@16: # include <boost/mpl/if.hpp>
Chris@16: # include <boost/python/to_python_indirect.hpp>
Chris@16: # include <boost/type_traits/composite_traits.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { 
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:   template <class R>
Chris@16:   struct reference_existing_object_requires_a_pointer_or_reference_return_type
Chris@16: # if defined(__GNUC__) && __GNUC__ >= 3 || defined(__EDG__)
Chris@16:   {}
Chris@16: # endif
Chris@16:   ;
Chris@16: }
Chris@16: 
Chris@16: template <class T> struct to_python_value;
Chris@16: 
Chris@16: struct reference_existing_object
Chris@16: {
Chris@16:     template <class T>
Chris@16:     struct apply
Chris@16:     {
Chris@16:         BOOST_STATIC_CONSTANT(
Chris@16:             bool, ok = is_pointer<T>::value || is_reference<T>::value);
Chris@16:         
Chris@16:         typedef typename mpl::if_c<
Chris@16:             ok
Chris@16:             , to_python_indirect<T, detail::make_reference_holder>
Chris@16:             , detail::reference_existing_object_requires_a_pointer_or_reference_return_type<T>
Chris@16:         >::type type;
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: }} // namespace boost::python
Chris@16: 
Chris@16: #endif // REFERENCE_EXISTING_OBJECT_DWA200222_HPP