Marshall Clow | 98760c1 | 2014-01-16 16:58:45 +0000 | [diff] [blame^] | 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
Howard Hinnant | aa69808 | 2010-07-16 19:08:36 +0000 | [diff] [blame] | 10 | #ifndef ITERATORS_H |
| 11 | #define ITERATORS_H |
| 12 | |
| 13 | #include <iterator> |
| 14 | |
| 15 | template <class It> |
Howard Hinnant | 27405f9 | 2010-08-14 18:14:02 +0000 | [diff] [blame] | 16 | class output_iterator |
| 17 | { |
| 18 | It it_; |
| 19 | |
| 20 | template <class U> friend class output_iterator; |
| 21 | public: |
| 22 | typedef std::output_iterator_tag iterator_category; |
Marshall Clow | 304c31b | 2013-01-09 17:20:02 +0000 | [diff] [blame] | 23 | typedef void value_type; |
Howard Hinnant | 27405f9 | 2010-08-14 18:14:02 +0000 | [diff] [blame] | 24 | typedef typename std::iterator_traits<It>::difference_type difference_type; |
| 25 | typedef It pointer; |
| 26 | typedef typename std::iterator_traits<It>::reference reference; |
| 27 | |
| 28 | It base() const {return it_;} |
| 29 | |
Marshall Clow | ba1920f | 2013-01-03 02:29:29 +0000 | [diff] [blame] | 30 | output_iterator () {} |
Howard Hinnant | 27405f9 | 2010-08-14 18:14:02 +0000 | [diff] [blame] | 31 | explicit output_iterator(It it) : it_(it) {} |
| 32 | template <class U> |
| 33 | output_iterator(const output_iterator<U>& u) :it_(u.it_) {} |
| 34 | |
| 35 | reference operator*() const {return *it_;} |
| 36 | |
| 37 | output_iterator& operator++() {++it_; return *this;} |
| 38 | output_iterator operator++(int) |
| 39 | {output_iterator tmp(*this); ++(*this); return tmp;} |
| 40 | }; |
| 41 | |
| 42 | template <class It> |
Howard Hinnant | aa69808 | 2010-07-16 19:08:36 +0000 | [diff] [blame] | 43 | class input_iterator |
| 44 | { |
| 45 | It it_; |
| 46 | |
| 47 | template <class U> friend class input_iterator; |
| 48 | public: |
| 49 | typedef std::input_iterator_tag iterator_category; |
| 50 | typedef typename std::iterator_traits<It>::value_type value_type; |
| 51 | typedef typename std::iterator_traits<It>::difference_type difference_type; |
| 52 | typedef It pointer; |
| 53 | typedef typename std::iterator_traits<It>::reference reference; |
| 54 | |
| 55 | It base() const {return it_;} |
| 56 | |
| 57 | input_iterator() : it_() {} |
| 58 | explicit input_iterator(It it) : it_(it) {} |
| 59 | template <class U> |
| 60 | input_iterator(const input_iterator<U>& u) :it_(u.it_) {} |
| 61 | |
| 62 | reference operator*() const {return *it_;} |
| 63 | pointer operator->() const {return it_;} |
| 64 | |
| 65 | input_iterator& operator++() {++it_; return *this;} |
| 66 | input_iterator operator++(int) |
| 67 | {input_iterator tmp(*this); ++(*this); return tmp;} |
| 68 | |
| 69 | friend bool operator==(const input_iterator& x, const input_iterator& y) |
| 70 | {return x.it_ == y.it_;} |
| 71 | friend bool operator!=(const input_iterator& x, const input_iterator& y) |
| 72 | {return !(x == y);} |
| 73 | }; |
| 74 | |
| 75 | template <class T, class U> |
| 76 | inline |
| 77 | bool |
| 78 | operator==(const input_iterator<T>& x, const input_iterator<U>& y) |
| 79 | { |
| 80 | return x.base() == y.base(); |
| 81 | } |
| 82 | |
| 83 | template <class T, class U> |
| 84 | inline |
| 85 | bool |
| 86 | operator!=(const input_iterator<T>& x, const input_iterator<U>& y) |
| 87 | { |
| 88 | return !(x == y); |
| 89 | } |
| 90 | |
| 91 | template <class It> |
| 92 | class forward_iterator |
| 93 | { |
| 94 | It it_; |
| 95 | |
| 96 | template <class U> friend class forward_iterator; |
| 97 | public: |
| 98 | typedef std::forward_iterator_tag iterator_category; |
| 99 | typedef typename std::iterator_traits<It>::value_type value_type; |
| 100 | typedef typename std::iterator_traits<It>::difference_type difference_type; |
| 101 | typedef It pointer; |
| 102 | typedef typename std::iterator_traits<It>::reference reference; |
| 103 | |
| 104 | It base() const {return it_;} |
| 105 | |
| 106 | forward_iterator() : it_() {} |
| 107 | explicit forward_iterator(It it) : it_(it) {} |
| 108 | template <class U> |
| 109 | forward_iterator(const forward_iterator<U>& u) :it_(u.it_) {} |
| 110 | |
| 111 | reference operator*() const {return *it_;} |
| 112 | pointer operator->() const {return it_;} |
| 113 | |
| 114 | forward_iterator& operator++() {++it_; return *this;} |
| 115 | forward_iterator operator++(int) |
| 116 | {forward_iterator tmp(*this); ++(*this); return tmp;} |
| 117 | |
| 118 | friend bool operator==(const forward_iterator& x, const forward_iterator& y) |
| 119 | {return x.it_ == y.it_;} |
| 120 | friend bool operator!=(const forward_iterator& x, const forward_iterator& y) |
| 121 | {return !(x == y);} |
| 122 | }; |
| 123 | |
| 124 | template <class T, class U> |
| 125 | inline |
| 126 | bool |
| 127 | operator==(const forward_iterator<T>& x, const forward_iterator<U>& y) |
| 128 | { |
| 129 | return x.base() == y.base(); |
| 130 | } |
| 131 | |
| 132 | template <class T, class U> |
| 133 | inline |
| 134 | bool |
| 135 | operator!=(const forward_iterator<T>& x, const forward_iterator<U>& y) |
| 136 | { |
| 137 | return !(x == y); |
| 138 | } |
| 139 | |
| 140 | template <class It> |
| 141 | class bidirectional_iterator |
| 142 | { |
| 143 | It it_; |
| 144 | |
| 145 | template <class U> friend class bidirectional_iterator; |
| 146 | public: |
| 147 | typedef std::bidirectional_iterator_tag iterator_category; |
| 148 | typedef typename std::iterator_traits<It>::value_type value_type; |
| 149 | typedef typename std::iterator_traits<It>::difference_type difference_type; |
| 150 | typedef It pointer; |
| 151 | typedef typename std::iterator_traits<It>::reference reference; |
| 152 | |
| 153 | It base() const {return it_;} |
| 154 | |
| 155 | bidirectional_iterator() : it_() {} |
| 156 | explicit bidirectional_iterator(It it) : it_(it) {} |
| 157 | template <class U> |
| 158 | bidirectional_iterator(const bidirectional_iterator<U>& u) :it_(u.it_) {} |
| 159 | |
| 160 | reference operator*() const {return *it_;} |
| 161 | pointer operator->() const {return it_;} |
| 162 | |
| 163 | bidirectional_iterator& operator++() {++it_; return *this;} |
| 164 | bidirectional_iterator operator++(int) |
| 165 | {bidirectional_iterator tmp(*this); ++(*this); return tmp;} |
| 166 | |
| 167 | bidirectional_iterator& operator--() {--it_; return *this;} |
| 168 | bidirectional_iterator operator--(int) |
| 169 | {bidirectional_iterator tmp(*this); --(*this); return tmp;} |
| 170 | }; |
| 171 | |
| 172 | template <class T, class U> |
| 173 | inline |
| 174 | bool |
| 175 | operator==(const bidirectional_iterator<T>& x, const bidirectional_iterator<U>& y) |
| 176 | { |
| 177 | return x.base() == y.base(); |
| 178 | } |
| 179 | |
| 180 | template <class T, class U> |
| 181 | inline |
| 182 | bool |
| 183 | operator!=(const bidirectional_iterator<T>& x, const bidirectional_iterator<U>& y) |
| 184 | { |
| 185 | return !(x == y); |
| 186 | } |
| 187 | |
| 188 | template <class It> |
| 189 | class random_access_iterator |
| 190 | { |
| 191 | It it_; |
| 192 | |
| 193 | template <class U> friend class random_access_iterator; |
| 194 | public: |
| 195 | typedef std::random_access_iterator_tag iterator_category; |
| 196 | typedef typename std::iterator_traits<It>::value_type value_type; |
| 197 | typedef typename std::iterator_traits<It>::difference_type difference_type; |
| 198 | typedef It pointer; |
| 199 | typedef typename std::iterator_traits<It>::reference reference; |
| 200 | |
| 201 | It base() const {return it_;} |
| 202 | |
| 203 | random_access_iterator() : it_() {} |
| 204 | explicit random_access_iterator(It it) : it_(it) {} |
| 205 | template <class U> |
| 206 | random_access_iterator(const random_access_iterator<U>& u) :it_(u.it_) {} |
| 207 | |
| 208 | reference operator*() const {return *it_;} |
| 209 | pointer operator->() const {return it_;} |
| 210 | |
| 211 | random_access_iterator& operator++() {++it_; return *this;} |
| 212 | random_access_iterator operator++(int) |
| 213 | {random_access_iterator tmp(*this); ++(*this); return tmp;} |
| 214 | |
| 215 | random_access_iterator& operator--() {--it_; return *this;} |
| 216 | random_access_iterator operator--(int) |
| 217 | {random_access_iterator tmp(*this); --(*this); return tmp;} |
| 218 | |
| 219 | random_access_iterator& operator+=(difference_type n) {it_ += n; return *this;} |
| 220 | random_access_iterator operator+(difference_type n) const |
| 221 | {random_access_iterator tmp(*this); tmp += n; return tmp;} |
| 222 | friend random_access_iterator operator+(difference_type n, random_access_iterator x) |
| 223 | {x += n; return x;} |
| 224 | random_access_iterator& operator-=(difference_type n) {return *this += -n;} |
| 225 | random_access_iterator operator-(difference_type n) const |
| 226 | {random_access_iterator tmp(*this); tmp -= n; return tmp;} |
| 227 | |
| 228 | reference operator[](difference_type n) const {return it_[n];} |
| 229 | }; |
| 230 | |
| 231 | template <class T, class U> |
| 232 | inline |
| 233 | bool |
| 234 | operator==(const random_access_iterator<T>& x, const random_access_iterator<U>& y) |
| 235 | { |
| 236 | return x.base() == y.base(); |
| 237 | } |
| 238 | |
| 239 | template <class T, class U> |
| 240 | inline |
| 241 | bool |
| 242 | operator!=(const random_access_iterator<T>& x, const random_access_iterator<U>& y) |
| 243 | { |
| 244 | return !(x == y); |
| 245 | } |
| 246 | |
| 247 | template <class T, class U> |
| 248 | inline |
| 249 | bool |
| 250 | operator<(const random_access_iterator<T>& x, const random_access_iterator<U>& y) |
| 251 | { |
| 252 | return x.base() < y.base(); |
| 253 | } |
| 254 | |
| 255 | template <class T, class U> |
| 256 | inline |
| 257 | bool |
| 258 | operator<=(const random_access_iterator<T>& x, const random_access_iterator<U>& y) |
| 259 | { |
| 260 | return !(y < x); |
| 261 | } |
| 262 | |
| 263 | template <class T, class U> |
| 264 | inline |
| 265 | bool |
| 266 | operator>(const random_access_iterator<T>& x, const random_access_iterator<U>& y) |
| 267 | { |
| 268 | return y < x; |
| 269 | } |
| 270 | |
| 271 | template <class T, class U> |
| 272 | inline |
| 273 | bool |
| 274 | operator>=(const random_access_iterator<T>& x, const random_access_iterator<U>& y) |
| 275 | { |
| 276 | return !(x < y); |
| 277 | } |
| 278 | |
| 279 | template <class T, class U> |
| 280 | inline |
| 281 | typename std::iterator_traits<T>::difference_type |
| 282 | operator-(const random_access_iterator<T>& x, const random_access_iterator<U>& y) |
| 283 | { |
| 284 | return x.base() - y.base(); |
| 285 | } |
| 286 | |
Marshall Clow | 8226d0b | 2013-01-04 18:24:04 +0000 | [diff] [blame] | 287 | template <class Iter> |
| 288 | inline Iter base(output_iterator<Iter> i) { return i.base(); } |
| 289 | |
| 290 | template <class Iter> |
| 291 | inline Iter base(input_iterator<Iter> i) { return i.base(); } |
| 292 | |
| 293 | template <class Iter> |
| 294 | inline Iter base(forward_iterator<Iter> i) { return i.base(); } |
| 295 | |
| 296 | template <class Iter> |
| 297 | inline Iter base(bidirectional_iterator<Iter> i) { return i.base(); } |
| 298 | |
| 299 | template <class Iter> |
| 300 | inline Iter base(random_access_iterator<Iter> i) { return i.base(); } |
| 301 | |
Howard Hinnant | 171771a | 2013-07-08 21:06:38 +0000 | [diff] [blame] | 302 | template <class Iter> // everything else |
Marshall Clow | 8226d0b | 2013-01-04 18:24:04 +0000 | [diff] [blame] | 303 | inline Iter base(Iter i) { return i; } |
| 304 | |
Howard Hinnant | bbd8086 | 2010-08-22 00:45:01 +0000 | [diff] [blame] | 305 | #endif // ITERATORS_H |