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  1. // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
  2. // Copyright (C) 2014 Andrzej Krzemienski.
  3. //
  4. // Distributed under the Boost Software License, Version 1.0.
  5. // (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_17SEP2003_HPP
  14. #define BOOST_NONE_17SEP2003_HPP
  15.  
  16. #include "boost/none_t.hpp"
  17.  
  18. // NOTE: Borland users have to include this header outside any precompiled headers
  19. // (bcc<=5.64 cannot include instance data in a precompiled header)
  20. //  -- * To be verified, now that there's no unnamed namespace
  21.  
  22. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost {
  23.  
  24. #ifdef BOOST_OPTIONAL_USE_OLD_DEFINITION_OF_NONE
  25.  
  26. none_t const none = (static_cast<none_t>(0)) ;
  27.  
  28. #elif defined BOOST_OPTIONAL_USE_SINGLETON_DEFINITION_OF_NONE
  29.  
  30. namespace detail { namespace optional_detail {
  31.  
  32.   // the trick here is to make mars_boost::none defined once as a global but in a header file
  33.   template <typename T>
  34.   struct none_instance
  35.   {
  36.     static const T instance;
  37.   };
  38.  
  39.   template <typename T>
  40.   const T none_instance<T>::instance = T(); // global, but because 'tis a template, no cpp file required
  41.  
  42. } } // namespace detail::optional_detail
  43.  
  44.  
  45. namespace {
  46.   // TU-local
  47.   const none_t& none = detail::optional_detail::none_instance<none_t>::instance;
  48. }
  49.  
  50. #else
  51.  
  52. const none_t none ((none_t::init_tag()));
  53.  
  54. #endif // older definitions
  55.  
  56. } // namespace mars_boost
  57.  
  58. #endif // header guard
  59.  
  60.  
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