// Copyright (C) 2003, Fernando Luis Cacciola Carballal.

// Copyright (C) 2007, Anthony Williams

// Copyright (C) 2007, Steven Watanabe, Richard Smith

//

// 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/lib/optional/ for documentation.

//

// You are welcome to contact the author at:

// fernando.cacciola@gmail.com

//

#ifndef BOOST_NONE_17SEP2003_HPP

#define BOOST_NONE_17SEP2003_HPP

namespace boost

{

  namespace detail

  {

    class none_helper;

  }

  inline void none(detail::none_helper);

  namespace detail

  {

    class none_helper

    {

    private:

      none_helper( none_helper const& ) {}

      friend void boost::none(none_helper);

    };

  }

  typedef void (*none_t)(detail::none_helper);

  inline void none(detail::none_helper) {}

}

#endif