gcc44: add forgotten file
[dragonfly.git] / contrib / gcc-4.4 / libstdc++-v3 / include / parallel / iterator.h
1 // -*- C++ -*-
2
3 // Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library.  This library is free
6 // software; you can redistribute it and/or modify it under the terms
7 // of the GNU General Public License as published by the Free Software
8 // Foundation; either version 3, or (at your option) any later
9 // version.
10
11 // This library is distributed in the hope that it will be useful, but
12 // WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 // General Public License for more details.
15
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23 // <http://www.gnu.org/licenses/>.
24
25 /** @file parallel/iterator.h
26  * @brief Helper iterator classes for the std::transform() functions.
27  *  This file is a GNU parallel extension to the Standard C++ Library.
28  */
29
30 // Written by Johannes Singler.
31
32 #ifndef _GLIBCXX_PARALLEL_ITERATOR_H
33 #define _GLIBCXX_PARALLEL_ITERATOR_H 1
34
35 #include <parallel/basic_iterator.h>
36 #include <bits/stl_pair.h>
37
38 namespace __gnu_parallel
39 {
40   /** @brief A pair of iterators. The usual iterator operations are
41    *  applied to both child iterators.
42    */
43   template<typename Iterator1, typename Iterator2, typename IteratorCategory>
44     class iterator_pair : public std::pair<Iterator1, Iterator2>
45     {
46     private:
47       typedef iterator_pair<Iterator1, Iterator2, IteratorCategory> type;
48       typedef std::pair<Iterator1, Iterator2> base_type;
49
50     public:
51       typedef IteratorCategory iterator_category;
52       typedef void value_type;
53
54       typedef std::iterator_traits<Iterator1> traits_type;
55       typedef typename traits_type::difference_type difference_type;
56       typedef type* pointer;
57       typedef type& reference;
58
59       iterator_pair() { }
60
61       iterator_pair(const Iterator1& first, const Iterator2& second) 
62       : base_type(first, second) { }
63
64       // Pre-increment operator.
65       type&
66       operator++()
67       {
68         ++base_type::first;
69         ++base_type::second;
70         return *this;
71       }
72
73       // Post-increment operator.
74       const type
75       operator++(int)
76       { return type(base_type::first++, base_type::second++); }
77
78       // Pre-decrement operator.
79       type&
80       operator--()
81       {
82         --base_type::first;
83         --base_type::second;
84         return *this;
85       }
86
87       // Post-decrement operator.
88       const type
89       operator--(int)
90       { return type(base_type::first--, base_type::second--); }
91
92       // Type conversion.
93       operator Iterator2() const
94       { return base_type::second; }
95
96       type&
97       operator=(const type& other)
98       {
99         base_type::first = other.first;
100         base_type::second = other.second;
101         return *this;
102       }
103
104       type
105       operator+(difference_type delta) const
106       { return type(base_type::first + delta, base_type::second + delta); }
107
108       difference_type
109       operator-(const type& other) const
110       { return base_type::first - other.first; }
111   };
112
113
114   /** @brief A triple of iterators. The usual iterator operations are
115       applied to all three child iterators.
116    */
117   template<typename Iterator1, typename Iterator2, typename Iterator3,
118            typename IteratorCategory>
119     class iterator_triple
120     {
121     private:
122       typedef iterator_triple<Iterator1, Iterator2, Iterator3,
123                               IteratorCategory> type;
124
125     public:
126       typedef IteratorCategory iterator_category;
127       typedef void value_type;
128       typedef typename std::iterator_traits<Iterator1>::difference_type
129                                                             difference_type;
130       typedef type* pointer;
131       typedef type& reference;
132
133       Iterator1 first;
134       Iterator2 second;
135       Iterator3 third;
136
137       iterator_triple() { }
138
139       iterator_triple(const Iterator1& _first, const Iterator2& _second,
140                       const Iterator3& _third)
141       {
142         first = _first;
143         second = _second;
144         third = _third;
145       }
146
147       // Pre-increment operator.
148       type&
149       operator++()
150       {
151         ++first;
152         ++second;
153         ++third;
154         return *this;
155       }
156
157       // Post-increment operator.
158       const type
159       operator++(int)
160       { return type(first++, second++, third++); }
161
162       // Pre-decrement operator.
163       type&
164       operator--()
165       {
166         --first;
167         --second;
168         --third;
169         return *this;
170       }
171
172       // Post-decrement operator.
173       const type
174       operator--(int)
175       { return type(first--, second--, third--); }
176
177       // Type conversion.
178       operator Iterator3() const
179       { return third; }
180
181       type&
182       operator=(const type& other)
183       {
184         first = other.first;
185         second = other.second;
186         third = other.third;
187         return *this;
188       }
189
190       type
191       operator+(difference_type delta) const
192       { return type(first + delta, second + delta, third + delta); }
193
194       difference_type
195       operator-(const type& other) const
196       { return first - other.first; }
197   };
198 }
199
200 #endif /* _GLIBCXX_PARALLEL_ITERATOR_H */