boost/detail/none_t.hpp

   1 // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
   2 //
   3 // Use, modification, and distribution is subject to the Boost Software
   4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // See http://www.boost.org/lib/optional for documentation.
   8 //
   9 // You are welcome to contact the author at:
  10 //  fernando_cacciola@hotmail.com
  11 //
  12 #ifndef BOOST_DETAIL_NONE_T_17SEP2003_HPP
  13 #define BOOST_DETAIL_NONE_T_17SEP2003_HPP
  14
  15 namespace boost {
  16
  17 namespace detail {
  18
  19 struct none_helper{};
  20
  21 typedef int none_helper::*none_t ;
  22
  23 } // namespace detail
  24
  25 } // namespace boost
  26
  27 #endif
  28