// 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__) && __GNUC__ >= 3 || 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

