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  1.  
  2. #ifndef BOOST_MPL_VOID_HPP_INCLUDED
  3. #define BOOST_MPL_VOID_HPP_INCLUDED
  4.  
  5. // Copyright Aleksey Gurtovoy 2001-2004
  6. //
  7. // Distributed under the Boost Software License, Version 1.0.
  8. // (See accompanying file LICENSE_1_0.txt or copy at
  9. // http://www.boost.org/LICENSE_1_0.txt)
  10. //
  11. // See http://www.boost.org/libs/mpl for documentation.
  12.  
  13. // $Id$
  14. // $Date$
  15. // $Revision$
  16.  
  17. #include <boost/mpl/void_fwd.hpp>
  18. #include <boost/mpl/bool.hpp>
  19. #include <boost/mpl/aux_/na_spec.hpp>
  20. #include <boost/mpl/aux_/config/msvc.hpp>
  21. #include <boost/mpl/aux_/config/workaround.hpp>
  22.  
  23. BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
  24.  
  25. //  [JDG Feb-4-2003] made void_ a complete type to allow it to be
  26. //  instantiated so that it can be passed in as an object that can be
  27. //  used to select an overloaded function. Possible use includes signaling
  28. //  a zero arity functor evaluation call.
  29. struct void_ { typedef void_ type; };
  30.  
  31. BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
  32.  
  33. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl {
  34.  
  35. template< typename T >
  36. struct is_void_
  37.     : false_
  38. {
  39. #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
  40.     using false_::value;
  41. #endif
  42. };
  43.  
  44. template<>
  45. struct is_void_<void_>
  46.     : true_
  47. {
  48. #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
  49.     using true_::value;
  50. #endif
  51. };
  52.  
  53. template< typename T >
  54. struct is_not_void_
  55.     : true_
  56. {
  57. #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
  58.     using true_::value;
  59. #endif
  60. };
  61.  
  62. template<>
  63. struct is_not_void_<void_>
  64.     : false_
  65. {
  66. #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
  67.     using false_::value;
  68. #endif
  69. };
  70.  
  71. BOOST_MPL_AUX_NA_SPEC(1, is_void_)
  72. BOOST_MPL_AUX_NA_SPEC(1, is_not_void_)
  73.  
  74. }}
  75.  
  76. #endif // BOOST_MPL_VOID_HPP_INCLUDED
  77.  
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