1 // -*- C++ -*- 2 3 // Copyright (C) 2007-2013 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, 44 typename _IteratorCategory> 45 class _IteratorPair : public std::pair<_Iterator1, _Iterator2> 46 { 47 private: 48 typedef std::pair<_Iterator1, _Iterator2> _Base; 49 50 public: 51 typedef _IteratorCategory iterator_category; 52 typedef void value_type; 53 54 typedef std::iterator_traits<_Iterator1> _TraitsType; 55 typedef typename _TraitsType::difference_type difference_type; 56 typedef _IteratorPair* pointer; 57 typedef _IteratorPair& reference; 58 59 _IteratorPair() { } 60 61 _IteratorPair(const _Iterator1& __first, const _Iterator2& __second) 62 : _Base(__first, __second) { } 63 64 // Pre-increment operator. 65 _IteratorPair& 66 operator++() 67 { 68 ++_Base::first; 69 ++_Base::second; 70 return *this; 71 } 72 73 // Post-increment operator. 74 const _IteratorPair 75 operator++(int) 76 { return _IteratorPair(_Base::first++, _Base::second++); } 77 78 // Pre-decrement operator. 79 _IteratorPair& 80 operator--() 81 { 82 --_Base::first; 83 --_Base::second; 84 return *this; 85 } 86 87 // Post-decrement operator. 88 const _IteratorPair 89 operator--(int) 90 { return _IteratorPair(_Base::first--, _Base::second--); } 91 92 // Type conversion. 93 operator _Iterator2() const 94 { return _Base::second; } 95 96 _IteratorPair& 97 operator=(const _IteratorPair& __other) 98 { 99 _Base::first = __other.first; 100 _Base::second = __other.second; 101 return *this; 102 } 103 104 _IteratorPair 105 operator+(difference_type __delta) const 106 { return _IteratorPair(_Base::first + __delta, _Base::second + __delta); 107 } 108 109 difference_type 110 operator-(const _IteratorPair& __other) const 111 { return _Base::first - __other.first; } 112 }; 113 114 115 /** @brief A triple of iterators. The usual iterator operations are 116 applied to all three child iterators. 117 */ 118 template<typename _Iterator1, typename _Iterator2, typename _Iterator3, 119 typename _IteratorCategory> 120 class _IteratorTriple 121 { 122 public: 123 typedef _IteratorCategory iterator_category; 124 typedef void value_type; 125 typedef typename std::iterator_traits<_Iterator1>::difference_type 126 difference_type; 127 typedef _IteratorTriple* pointer; 128 typedef _IteratorTriple& reference; 129 130 _Iterator1 _M_first; 131 _Iterator2 _M_second; 132 _Iterator3 _M_third; 133 134 _IteratorTriple() { } 135 136 _IteratorTriple(const _Iterator1& __first, const _Iterator2& __second, 137 const _Iterator3& __third) 138 { 139 _M_first = __first; 140 _M_second = __second; 141 _M_third = __third; 142 } 143 144 // Pre-increment operator. 145 _IteratorTriple& 146 operator++() 147 { 148 ++_M_first; 149 ++_M_second; 150 ++_M_third; 151 return *this; 152 } 153 154 // Post-increment operator. 155 const _IteratorTriple 156 operator++(int) 157 { return _IteratorTriple(_M_first++, _M_second++, _M_third++); } 158 159 // Pre-decrement operator. 160 _IteratorTriple& 161 operator--() 162 { 163 --_M_first; 164 --_M_second; 165 --_M_third; 166 return *this; 167 } 168 169 // Post-decrement operator. 170 const _IteratorTriple 171 operator--(int) 172 { return _IteratorTriple(_M_first--, _M_second--, _M_third--); } 173 174 // Type conversion. 175 operator _Iterator3() const 176 { return _M_third; } 177 178 _IteratorTriple& 179 operator=(const _IteratorTriple& __other) 180 { 181 _M_first = __other._M_first; 182 _M_second = __other._M_second; 183 _M_third = __other._M_third; 184 return *this; 185 } 186 187 _IteratorTriple 188 operator+(difference_type __delta) const 189 { return _IteratorTriple(_M_first + __delta, _M_second + __delta, 190 _M_third + __delta); } 191 192 difference_type 193 operator-(const _IteratorTriple& __other) const 194 { return _M_first - __other._M_first; } 195 }; 196 } 197 198 #endif /* _GLIBCXX_PARALLEL_ITERATOR_H */ 199
