src/thirdparty/boost_1_47_0/boost/mpl/vector/aux_/item.hpp

   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: item.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
  14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
  15 // $Revision: 49267 $
  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 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