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
24namespace boost { namespace mpl {
25
26#if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
27
28template<
29 typename T
30 , typename Base
31 , int at_front = 0
32 >
33struct 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
48template<
49 typename T
50 , typename Base
51 >
52struct 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
66template<
67 typename Base
68 , int at_front
69 >
70struct 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
83template<
84 typename Base
85 >
86struct 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

source code of include/boost/mpl/vector/aux_/item.hpp