| 1 | // Copyright David Abrahams 2002. |
|---|---|
| 2 | // Distributed under the Boost Software License, Version 1.0. (See |
| 3 | // accompanying file LICENSE_1_0.txt or copy at |
| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
| 5 | #ifndef RETURN_INTERNAL_REFERENCE_DWA2002131_HPP |
| 6 | # define RETURN_INTERNAL_REFERENCE_DWA2002131_HPP |
| 7 | |
| 8 | # include <boost/python/detail/prefix.hpp> |
| 9 | |
| 10 | # include <boost/python/default_call_policies.hpp> |
| 11 | # include <boost/python/reference_existing_object.hpp> |
| 12 | # include <boost/python/with_custodian_and_ward.hpp> |
| 13 | # include <boost/mpl/if.hpp> |
| 14 | |
| 15 | namespace boost { namespace python { |
| 16 | |
| 17 | namespace detail |
| 18 | { |
| 19 | template <std::size_t> |
| 20 | struct return_internal_reference_owner_arg_must_be_greater_than_zero |
| 21 | # if defined(__GNUC__) || defined(__EDG__) |
| 22 | {} |
| 23 | # endif |
| 24 | ; |
| 25 | } |
| 26 | |
| 27 | template <std::size_t owner_arg = 1, class BasePolicy_ = default_call_policies> |
| 28 | struct return_internal_reference |
| 29 | : with_custodian_and_ward_postcall<0, owner_arg, BasePolicy_> |
| 30 | { |
| 31 | private: |
| 32 | BOOST_STATIC_CONSTANT(bool, legal = owner_arg > 0); |
| 33 | public: |
| 34 | typedef typename mpl::if_c< |
| 35 | legal |
| 36 | , reference_existing_object |
| 37 | , detail::return_internal_reference_owner_arg_must_be_greater_than_zero<owner_arg> |
| 38 | >::type result_converter; |
| 39 | }; |
| 40 | |
| 41 | }} // namespace boost::python |
| 42 | |
| 43 | #endif // RETURN_INTERNAL_REFERENCE_DWA2002131_HPP |
| 44 |