text: 
  #ifndef BOOST_MPL_AUX_CONTAINS_IMPL_HPP_INCLUDED
  #define BOOST_MPL_AUX_CONTAINS_IMPL_HPP_INCLUDED
  
  // Copyright Eric Friedman 2002
  // Copyright Aleksey Gurtovoy 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.
  
  // $Id: contains_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
  // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
  // $Revision: 49267 $
  
  #include <boost/mpl/contains_fwd.hpp>
  #include <boost/mpl/begin_end.hpp>
  #include <boost/mpl/find.hpp>
  #include <boost/mpl/not.hpp>
  #include <boost/mpl/aux_/traits_lambda_spec.hpp>
  #include <boost/mpl/aux_/config/forwarding.hpp>
  #include <boost/mpl/aux_/config/static_constant.hpp>
  
  #include <boost/type_traits/is_same.hpp>
  
  namespace boost { namespace mpl {
  
  template< typename Tag >
  struct contains_impl
  {
      template< typename Sequence, typename T > struct apply
  #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
          : not_< is_same<
                typename find<Sequence,T>::type
              , typename end<Sequence>::type
              > >
      {
  #else
      {
          typedef not_< is_same<
                typename find<Sequence,T>::type
              , typename end<Sequence>::type
              > > type;
  
          BOOST_STATIC_CONSTANT(bool, value = 
                (not_< is_same<
                    typename find<Sequence,T>::type
                  , typename end<Sequence>::type
                  > >::value)
              );
  #endif
      };
  };
  
  BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2,contains_impl)
  
  }}
  
  #endif // BOOST_MPL_AUX_CONTAINS_IMPL_HPP_INCLUDED
  