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  1.  
  2. #ifndef BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED
  3. #define BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED
  4.  
  5. // Copyright Aleksey Gurtovoy 2000-2004
  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/long.hpp>
  18. #include <boost/mpl/void.hpp>
  19. #include <boost/mpl/next_prior.hpp>
  20. #include <boost/mpl/aux_/type_wrapper.hpp>
  21. #include <boost/mpl/aux_/config/typeof.hpp>
  22. #include <boost/mpl/aux_/config/ctps.hpp>
  23.  
  24. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl {
  25.  
  26. #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
  27.  
  28. template<
  29.       typename T
  30.     , typename Base
  31.     , int at_front = 0
  32.     >
  33. struct v_item
  34.     : Base
  35. {
  36.     typedef typename Base::upper_bound_ index_;
  37.     typedef typename next<index_>::type upper_bound_;
  38.     typedef typename next<typename Base::size>::type size;
  39.     typedef Base base;
  40.     typedef v_item type;
  41.  
  42.     // agurt 10/sep/04: MWCW <= 9.3 workaround here and below; the compiler
  43.     // breaks if using declaration comes _before_ the new overload
  44.     static aux::type_wrapper<T> item_(index_);
  45.     using Base::item_;
  46. };
  47.  
  48. template<
  49.       typename T
  50.     , typename Base
  51.     >
  52. struct v_item<T,Base,1>
  53.     : Base
  54. {
  55.     typedef typename prior<typename Base::lower_bound_>::type index_;
  56.     typedef index_ lower_bound_;
  57.     typedef typename next<typename Base::size>::type size;
  58.     typedef Base base;
  59.     typedef v_item type;
  60.  
  61.     static aux::type_wrapper<T> item_(index_);
  62.     using Base::item_;
  63. };
  64.  
  65. // "erasure" item
  66. template<
  67.       typename Base
  68.     , int at_front
  69.     >
  70. struct v_mask
  71.     : Base
  72. {
  73.     typedef typename prior<typename Base::upper_bound_>::type index_;
  74.     typedef index_ upper_bound_;
  75.     typedef typename prior<typename Base::size>::type size;
  76.     typedef Base base;
  77.     typedef v_mask type;
  78.  
  79.     static aux::type_wrapper<void_> item_(index_);
  80.     using Base::item_;
  81. };
  82.  
  83. template<
  84.       typename Base
  85.     >
  86. struct v_mask<Base,1>
  87.     : Base
  88. {
  89.     typedef typename Base::lower_bound_ index_;
  90.     typedef typename next<index_>::type lower_bound_;
  91.     typedef typename prior<typename Base::size>::type size;
  92.     typedef Base base;
  93.     typedef v_mask type;
  94.  
  95.     static aux::type_wrapper<void_> item_(index_);
  96.     using Base::item_;
  97. };
  98.  
  99. #endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
  100.  
  101. }}
  102.  
  103. #endif // BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED
  104.  
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