text: 
  #ifndef BOOST_MPL_ALWAYS_HPP_INCLUDED
  #define BOOST_MPL_ALWAYS_HPP_INCLUDED
  
  // 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.
  
  // $Id$
  // $Date$
  // $Revision$
  
  #include <boost/mpl/aux_/preprocessor/default_params.hpp>
  #include <boost/mpl/aux_/na.hpp>
  #include <boost/mpl/aux_/arity_spec.hpp>
  
  namespace boost { namespace mpl {
  
  template< typename Value > struct always
  {
      template<
          BOOST_MPL_PP_DEFAULT_PARAMS(BOOST_MPL_LIMIT_METAFUNCTION_ARITY, typename T, na)
          >
      struct apply
      {
          typedef Value type;
      };
  };
  
  BOOST_MPL_AUX_ARITY_SPEC(0, always)
  
  }}
  
  #endif // BOOST_MPL_ALWAYS_HPP_INCLUDED
  