| // 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 RETURN_INTERNAL_REFERENCE_DWA2002131_HPP |
| # define RETURN_INTERNAL_REFERENCE_DWA2002131_HPP |
| |
| # include <boost/python/detail/prefix.hpp> |
| |
| # include <boost/python/default_call_policies.hpp> |
| # include <boost/python/reference_existing_object.hpp> |
| # include <boost/python/with_custodian_and_ward.hpp> |
| # include <boost/mpl/if.hpp> |
| |
| namespace boost { namespace python { |
| |
| namespace detail |
| { |
| template <std::size_t> |
| struct return_internal_reference_owner_arg_must_be_greater_than_zero |
| # if defined(__GNUC__) && __GNUC__ >= 3 || defined(__EDG__) |
| {} |
| # endif |
| ; |
| } |
| |
| template <std::size_t owner_arg = 1, class BasePolicy_ = default_call_policies> |
| struct return_internal_reference |
| : with_custodian_and_ward_postcall<0, owner_arg, BasePolicy_> |
| { |
| private: |
| BOOST_STATIC_CONSTANT(bool, legal = owner_arg > 0); |
| public: |
| typedef typename mpl::if_c< |
| legal |
| , reference_existing_object |
| , detail::return_internal_reference_owner_arg_must_be_greater_than_zero<owner_arg> |
| >::type result_converter; |
| }; |
| |
| }} // namespace boost::python |
| |
| #endif // RETURN_INTERNAL_REFERENCE_DWA2002131_HPP |