#ifndef BOOST_MPL_SWITCH_HPP_INCLUDED

 #define BOOST_MPL_SWITCH_HPP_INCLUDED

 // Copyright Aleksey Gurtovoy 2003-2004

 //

 // 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/switch.hpp,v $

 // $Date: 2004/09/02 15:40:42 $

 // $Revision: 1.3 $

 #include <boost/mpl/find_if.hpp>

 #include <boost/mpl/deref.hpp>

 #include <boost/mpl/lambda.hpp>

 #include <boost/mpl/apply.hpp>

 #include <boost/mpl/pair.hpp>

 #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(Body)

     , typename BOOST_MPL_AUX_NA_PARAM(T)

     >

 struct switch_

 {

     typedef typename find_if<

           Body

         , apply1< lambda< first<_1> >, T >

         >::type iter_;

     typedef typename deref<iter_>::type pair_;

     typedef typename lambda< typename second<pair_>::type >::type f_;

     typedef typename apply1<f_,T>::type type;

     BOOST_MPL_AUX_LAMBDA_SUPPORT(2,switch_,(Body,T))

 };

 BOOST_MPL_AUX_NA_SPEC(2, switch_)

 }}

 #endif // BOOST_MPL_SWITCH_HPP_INCLUDED