python/include/boost/python/return_internal_reference.hpp at develop · shelltdf/python

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// 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__) || 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