1
2#ifndef BOOST_MPL_AUX_VECTOR_ITERATOR_HPP_INCLUDED
3#define BOOST_MPL_AUX_VECTOR_ITERATOR_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/vector/aux_/at.hpp>
18#include <boost/mpl/iterator_tags.hpp>
19#include <boost/mpl/plus.hpp>
20#include <boost/mpl/minus.hpp>
21#include <boost/mpl/advance_fwd.hpp>
22#include <boost/mpl/distance_fwd.hpp>
23#include <boost/mpl/next.hpp>
24#include <boost/mpl/prior.hpp>
25#include <boost/mpl/aux_/nttp_decl.hpp>
26#include <boost/mpl/aux_/value_wknd.hpp>
27#include <boost/mpl/aux_/config/ctps.hpp>
28#include <boost/mpl/aux_/config/workaround.hpp>
29
30namespace boost { namespace mpl {
31
32template<
33 typename Vector
34 , BOOST_MPL_AUX_NTTP_DECL(long, n_)
35 >
36struct v_iter
37{
38 typedef aux::v_iter_tag tag;
39 typedef random_access_iterator_tag category;
40 typedef typename v_at<Vector,n_>::type type;
41
42 typedef Vector vector_;
43 typedef mpl::long_<n_> pos;
44
45#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
46 enum {
47 next_ = n_ + 1
48 , prior_ = n_ - 1
49 , pos_ = n_
50 };
51
52 typedef v_iter<Vector,next_> next;
53 typedef v_iter<Vector,prior_> prior;
54#endif
55
56};
57
58
59#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
60
61template<
62 typename Vector
63 , BOOST_MPL_AUX_NTTP_DECL(long, n_)
64 >
65struct next< v_iter<Vector,n_> >
66{
67 typedef v_iter<Vector,(n_ + 1)> type;
68};
69
70template<
71 typename Vector
72 , BOOST_MPL_AUX_NTTP_DECL(long, n_)
73 >
74struct prior< v_iter<Vector,n_> >
75{
76 typedef v_iter<Vector,(n_ - 1)> type;
77};
78
79template<
80 typename Vector
81 , BOOST_MPL_AUX_NTTP_DECL(long, n_)
82 , typename Distance
83 >
84struct advance< v_iter<Vector,n_>,Distance>
85{
86 typedef v_iter<
87 Vector
88 , (n_ + BOOST_MPL_AUX_NESTED_VALUE_WKND(long, Distance))
89 > type;
90};
91
92template<
93 typename Vector
94 , BOOST_MPL_AUX_NTTP_DECL(long, n_)
95 , BOOST_MPL_AUX_NTTP_DECL(long, m_)
96 >
97struct distance< v_iter<Vector,n_>, v_iter<Vector,m_> >
98 : mpl::long_<(m_ - n_)>
99{
100};
101
102#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
103
104template<> struct advance_impl<aux::v_iter_tag>
105{
106 template< typename Iterator, typename N > struct apply
107 {
108 enum { pos_ = Iterator::pos_, n_ = N::value };
109 typedef v_iter<
110 typename Iterator::vector_
111 , (pos_ + n_)
112 > type;
113 };
114};
115
116template<> struct distance_impl<aux::v_iter_tag>
117{
118 template< typename Iter1, typename Iter2 > struct apply
119 {
120 enum { pos1_ = Iter1::pos_, pos2_ = Iter2::pos_ };
121 typedef long_<( pos2_ - pos1_ )> type;
122 BOOST_STATIC_CONSTANT(long, value = ( pos2_ - pos1_ ));
123 };
124};
125
126#endif
127
128}}
129
130#endif // BOOST_MPL_AUX_VECTOR_ITERATOR_HPP_INCLUDED
131

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