/Src/Dependencies/Boost/boost/mpl/tag.hpp

http://hadesmem.googlecode.com/ · C++ Header · 52 lines · 32 code · 10 blank · 10 comment · 0 complexity · 35e049bbfe44447a9233045d35431c39 MD5 · raw file 

    

  1. #ifndef BOOST_MPL_TAG_HPP_INCLUDED
    2. 

  2. #define BOOST_MPL_TAG_HPP_INCLUDED
    3. 

  3. 

  4. // Copyright Aleksey Gurtovoy 2004
    5. 

  5. //
    6. 

  6. // Distributed under the Boost Software License, Version 1.0. 
    7. 

  7. // (See accompanying file LICENSE_1_0.txt or copy at 
    8. 

  8. // http://www.boost.org/LICENSE_1_0.txt)
    9. 

  9. //
    10. 

  10. // See http://www.boost.org/libs/mpl for documentation.
    11. 

  11. 

  12. // $Id: tag.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
    13. 

  13. // $Date: 2008-10-11 17:19:02 +1100 (Sat, 11 Oct 2008) $
    14. 

  14. // $Revision: 49267 $
    15. 

  15. 

  16. #include <boost/mpl/eval_if.hpp>
    17. 

  17. #include <boost/mpl/void.hpp>
    18. 

  18. #include <boost/mpl/aux_/has_tag.hpp>
    19. 

  19. #include <boost/mpl/aux_/config/eti.hpp>
    20. 

  20. 

  21. namespace boost { namespace mpl {
    22. 

  22. 

  23. namespace aux {
    24. 

  24. template< typename T > struct tag_impl
    25. 

  25. {
    26. 

  26.     typedef typename T::tag type;
    27. 

  27. };
    28. 

  28. }
    29. 

  29. 

  30. template< typename T, typename Default = void_ > struct tag
    31. 

  31. #if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
    32. 

  32.     : if_< 
    33. 

  33.           aux::has_tag<T>
    34. 

  34.         , aux::tag_impl<T>
    35. 

  35.         , Default
    36. 

  36.         >::type
    37. 

  37. {
    38. 

  38. #else
    39. 

  39. {
    40. 

  40.     typedef typename eval_if< 
    41. 

  41.           aux::has_tag<T>
    42. 

  42.         , aux::tag_impl<T>
    43. 

  43.         , Default
    44. 

  44.         >::type type;
    45. 

  45. 

  46. #endif
    47. 

  47. };
    48. 

  48. 

  49. }}
    50. 

  50. 

  51. #endif // BOOST_MPL_TAG_HPP_INCLUDED
    52.