sl@0: // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
sl@0: // Copyright (C) 2007, Anthony Williams
sl@0: // Copyright (C) 2007, Steven Watanabe, Richard Smith
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0.
sl@0: // (See accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/lib/optional/ for documentation.
sl@0: //
sl@0: // You are welcome to contact the author at:
sl@0: // fernando.cacciola@gmail.com
sl@0: //
sl@0: #ifndef BOOST_NONE_17SEP2003_HPP
sl@0: #define BOOST_NONE_17SEP2003_HPP
sl@0: 
sl@0: namespace boost
sl@0: {
sl@0:   namespace detail
sl@0:   {
sl@0:     class none_helper;
sl@0:   }
sl@0: 
sl@0:   inline void none(detail::none_helper);
sl@0: 
sl@0:   namespace detail
sl@0:   {
sl@0:     class none_helper
sl@0:     {
sl@0:     private:
sl@0:       
sl@0:       none_helper( none_helper const& ) {}
sl@0:       
sl@0:       friend void boost::none(none_helper);
sl@0:     };
sl@0:   }
sl@0: 
sl@0:   typedef void (*none_t)(detail::none_helper);
sl@0: 
sl@0:   inline void none(detail::none_helper) {}
sl@0: }
sl@0: 
sl@0: #endif