[857] | 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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