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  1. // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
  2. // Copyright (C) 2014 Andrzej Krzemienski.
  3. //
  4. // Use, modification, and distribution is subject to the Boost Software
  5. // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  6. // http://www.boost.org/LICENSE_1_0.txt)
  7. //
  8. // See http://www.boost.org/libs/optional for documentation.
  9. //
  10. // You are welcome to contact the author at:
  11. //  fernando_cacciola@hotmail.com
  12. //
  13. #ifndef BOOST_NONE_T_17SEP2003_HPP
  14. #define BOOST_NONE_T_17SEP2003_HPP
  15.  
  16. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost {
  17.  
  18. #ifdef BOOST_OPTIONAL_USE_OLD_DEFINITION_OF_NONE
  19.  
  20. namespace detail { struct none_helper{}; }
  21. typedef int detail::none_helper::*none_t ;
  22.  
  23. #elif defined BOOST_OPTIONAL_USE_SINGLETON_DEFINITION_OF_NONE
  24.  
  25. class none_t {};
  26.  
  27. #else
  28.  
  29. struct none_t
  30. {
  31.   struct init_tag{};
  32.   explicit none_t(init_tag){} // to prevent default constructor
  33. };
  34.  
  35. #endif // old implementation workarounds
  36.  
  37. } // namespace mars_boost
  38.  
  39. #endif // header guard
  40.  
  41.  
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