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