#if !defined(BOOST_PP_IS_ITERATING)

 ///// header body

 #ifndef BOOST_MPL_ARG_HPP_INCLUDED

 #define BOOST_MPL_ARG_HPP_INCLUDED

 // Copyright Peter Dimov 2001-2002

 // Copyright Aleksey Gurtovoy 2001-2004

 //

 // 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)

 //

 // See http://www.boost.org/libs/mpl for documentation.

 // $Source: /cvsroot/boost/boost/boost/mpl/arg.hpp,v $

 // $Date: 2004/09/21 13:48:07 $

 // $Revision: 1.12 $

 #if !defined(BOOST_MPL_PREPROCESSING_MODE)

 #   include <boost/mpl/arg_fwd.hpp>

 #   include <boost/mpl/aux_/na.hpp>

 #   include <boost/mpl/aux_/na_assert.hpp>

 #   include <boost/mpl/aux_/arity_spec.hpp>

 #   include <boost/mpl/aux_/arg_typedef.hpp>

 #endif

 #include <boost/mpl/aux_/config/static_constant.hpp>

 #include <boost/mpl/aux_/config/use_preprocessed.hpp>

 #if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \

     && !defined(BOOST_MPL_PREPROCESSING_MODE)

 #   define BOOST_MPL_PREPROCESSED_HEADER arg.hpp

 #   include <boost/mpl/aux_/include_preprocessed.hpp>

 #else

 #   include <boost/mpl/limits/arity.hpp>

 #   include <boost/mpl/aux_/preprocessor/default_params.hpp>

 #   include <boost/mpl/aux_/preprocessor/params.hpp>

 #   include <boost/mpl/aux_/config/lambda.hpp>

 #   include <boost/mpl/aux_/config/dtp.hpp>

 #   include <boost/mpl/aux_/nttp_decl.hpp>

 #   include <boost/preprocessor/iterate.hpp>

 #   include <boost/preprocessor/inc.hpp>

 #   include <boost/preprocessor/cat.hpp>

 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN

 // local macro, #undef-ined at the end of the header

 #if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)

 #   define AUX778076_ARG_N_DEFAULT_PARAMS(param,value) \

     BOOST_MPL_PP_DEFAULT_PARAMS( \

           BOOST_MPL_LIMIT_METAFUNCTION_ARITY \

         , param \

         , value \

         ) \

     /**/

 #else

 #   define AUX778076_ARG_N_DEFAULT_PARAMS(param,value) \

     BOOST_MPL_PP_PARAMS( \

           BOOST_MPL_LIMIT_METAFUNCTION_ARITY \

         , param \

         ) \

     /**/

 #endif

 #define BOOST_PP_ITERATION_PARAMS_1 \

     (3,(0, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, <boost/mpl/arg.hpp>))

 #include BOOST_PP_ITERATE()

 #   undef AUX778076_ARG_N_DEFAULT_PARAMS

 BOOST_MPL_AUX_NONTYPE_ARITY_SPEC(1,int,arg)

 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE

 #endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS

 #endif // BOOST_MPL_ARG_HPP_INCLUDED

 ///// iteration

 #else

 #define i_ BOOST_PP_FRAME_ITERATION(1)

 #if i_ > 0

 template<> struct arg<i_>

 {

     BOOST_STATIC_CONSTANT(int, value = i_);

     typedef arg<BOOST_PP_INC(i_)> next;

     BOOST_MPL_AUX_ARG_TYPEDEF(na, tag)

     BOOST_MPL_AUX_ARG_TYPEDEF(na, type)

     template<

           AUX778076_ARG_N_DEFAULT_PARAMS(typename U, na)

         >

     struct apply

     {

         typedef BOOST_PP_CAT(U,i_) type;

         BOOST_MPL_AUX_ASSERT_NOT_NA(type);

     };

 };

 #else

 template<> struct arg<-1>

 {

     BOOST_STATIC_CONSTANT(int, value = -1);

     BOOST_MPL_AUX_ARG_TYPEDEF(na, tag)

     BOOST_MPL_AUX_ARG_TYPEDEF(na, type)

     template<

           AUX778076_ARG_N_DEFAULT_PARAMS(typename U, na)

         >

     struct apply

     {

         typedef U1 type;

         BOOST_MPL_AUX_ASSERT_NOT_NA(type);

     };

 };

 #endif // i_ > 0

 #undef i_

 #endif // BOOST_PP_IS_ITERATING