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select.hpp

select.hpp 3.0 KB
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  1. // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
    2. 

  2. // (C) Copyright 2003-2007 Jonathan Turkanis
    3. 

  3. // Distributed under the Boost Software License, Version 1.0. (See accompanying
    4. 

  4. // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
    5. 

  5. 

  6. // See http://www.boost.org/libs/iostreams for documentation.
    7. 

  7. 

  8. // Contains the metafunction select, which mimics the effect of a chain of
    9. 

  9. // nested mpl if_'s.
    10. 

  10. //
    11. 

  11. // -----------------------------------------------------------------------------
    12. 

  12. //
    13. 

  13. // Usage:
    14. 

  14. //      
    15. 

  15. // typedef typename select<
    16. 

  16. //                      case1,  type1,
    17. 

  17. //                      case2,  type2,
    18. 

  18. //                      ...
    19. 

  19. //                      true_,  typen
    20. 

  20. //                  >::type selection;
    21. 

  21. //
    22. 

  22. // Here case1, case2, ... are models of MPL::IntegralConstant with value type
    23. 

  23. // bool, and n <= 12.
    24. 

  24. 

  25. #ifndef BOOST_IOSTREAMS_SELECT_HPP_INCLUDED
    26. 

  26. #define BOOST_IOSTREAMS_SELECT_HPP_INCLUDED   
    27. 

  27. 

  28. #if defined(_MSC_VER) && (_MSC_VER >= 1020)
    29. 

  29. # pragma once
    30. 

  30. #endif                  
    31. 

  31.  
    32. 

  32. #include <boost/type_traits/is_base_and_derived.hpp>
    33. 

  33. #include <boost/mpl/eval_if.hpp>
    34. 

  34. #include <boost/mpl/identity.hpp>
    35. 

  35. #include <boost/mpl/if.hpp>
    36. 

  36. #include <boost/mpl/void.hpp>
    37. 

  37. 

  38. namespace boost { namespace iostreams { 
    39. 

  39. 

  40. typedef mpl::true_ else_;
    41. 

  41. 

  42. template< typename Case1 = mpl::true_,
    43. 

  43.           typename Type1 = mpl::void_,
    44. 

  44.           typename Case2 = mpl::true_,
    45. 

  45.           typename Type2 = mpl::void_,
    46. 

  46.           typename Case3 = mpl::true_,
    47. 

  47.           typename Type3 = mpl::void_,
    48. 

  48.           typename Case4 = mpl::true_,
    49. 

  49.           typename Type4 = mpl::void_,
    50. 

  50.           typename Case5 = mpl::true_,
    51. 

  51.           typename Type5 = mpl::void_,
    52. 

  52.           typename Case6 = mpl::true_,
    53. 

  53.           typename Type6 = mpl::void_,
    54. 

  54.           typename Case7 = mpl::true_,
    55. 

  55.           typename Type7 = mpl::void_,
    56. 

  56.           typename Case8 = mpl::true_,
    57. 

  57.           typename Type8 = mpl::void_,
    58. 

  58.           typename Case9 = mpl::true_,
    59. 

  59.           typename Type9 = mpl::void_,
    60. 

  60.           typename Case10 = mpl::true_,
    61. 

  61.           typename Type10 = mpl::void_,
    62. 

  62.           typename Case11 = mpl::true_,
    63. 

  63.           typename Type11 = mpl::void_,
    64. 

  64.           typename Case12 = mpl::true_,
    65. 

  65.           typename Type12 = mpl::void_ >
    66. 

  66. struct select {
    67. 

  67.     typedef typename
    68. 

  68.             mpl::eval_if<
    69. 

  69.                 Case1, mpl::identity<Type1>, mpl::eval_if<
    70. 

  70.                 Case2, mpl::identity<Type2>, mpl::eval_if<
    71. 

  71.                 Case3, mpl::identity<Type3>, mpl::eval_if<
    72. 

  72.                 Case4, mpl::identity<Type4>, mpl::eval_if<
    73. 

  73.                 Case5, mpl::identity<Type5>, mpl::eval_if<
    74. 

  74.                 Case6, mpl::identity<Type6>, mpl::eval_if<
    75. 

  75.                 Case7, mpl::identity<Type7>, mpl::eval_if<
    76. 

  76.                 Case8, mpl::identity<Type8>, mpl::eval_if<
    77. 

  77.                 Case9, mpl::identity<Type9>, mpl::eval_if<
    78. 

  78.                 Case10, mpl::identity<Type10>, mpl::eval_if<
    79. 

  79.                 Case11, mpl::identity<Type11>, mpl::if_<
    80. 

  80.                 Case12, Type12, mpl::void_ > > > > > > > > > > >
    81. 

  81.             >::type type;
    82. 

  82. };
    83. 

  83. 

  84. } } // End namespaces iostreams, boost.
    85. 

  85. 

  86. #endif // #ifndef BOOST_IOSTREAMS_SELECT_HPP_INCLUDED
    87.