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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 |