#ifndef BOOST_MPL_IDENTITY_HPP_INCLUDED

 #define BOOST_MPL_IDENTITY_HPP_INCLUDED

 // Copyright Aleksey Gurtovoy 2000-2004

 //

 // 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/identity.hpp,v $

 // $Date: 2004/09/02 15:40:41 $

 // $Revision: 1.4 $

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

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

 namespace boost { namespace mpl {

 template<

       typename BOOST_MPL_AUX_NA_PARAM(T)

     >

 struct identity

 {

     typedef T type;

     BOOST_MPL_AUX_LAMBDA_SUPPORT(1, identity, (T))

 };

 template<

       typename BOOST_MPL_AUX_NA_PARAM(T)

     >

 struct make_identity

 {

     typedef identity<T> type;

     BOOST_MPL_AUX_LAMBDA_SUPPORT(1, make_identity, (T))

 };

 BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, identity)

 BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, make_identity)

 }}

 #endif // BOOST_MPL_IDENTITY_HPP_INCLUDED