| 248 | // The iterator class |
| 249 | template <typename octet_iterator> |
| 250 | class iterator { |
| 251 | octet_iterator it; |
| 252 | octet_iterator range_start; |
| 253 | octet_iterator range_end; |
| 254 | public: |
| 255 | typedef uint32_t value_type; |
| 256 | typedef uint32_t* pointer; |
| 257 | typedef uint32_t& reference; |
| 258 | typedef std::ptrdiff_t difference_type; |
| 259 | typedef std::bidirectional_iterator_tag iterator_category; |
| 260 | iterator () {} |
| 261 | explicit iterator (const octet_iterator& octet_it, |
| 262 | const octet_iterator& rangestart, |
| 263 | const octet_iterator& rangeend) : |
| 264 | it(octet_it), range_start(rangestart), range_end(rangeend) |
| 265 | { |
| 266 | if (it < range_start || it > range_end) |
| 267 | throw std::out_of_range("Invalid utf-8 iterator position"); |
| 268 | } |
| 269 | // the default "big three" are OK |
| 270 | octet_iterator base () const { return it; } |
| 271 | uint32_t operator * () const |
| 272 | { |
| 273 | octet_iterator temp = it; |
| 274 | return utf8::next(temp, range_end); |
| 275 | } |
| 276 | bool operator == (const iterator& rhs) const |
| 277 | { |
| 278 | if (range_start != rhs.range_start || range_end != rhs.range_end) |
| 279 | throw std::logic_error("Comparing utf-8 iterators defined with different ranges"); |
| 280 | return (it == rhs.it); |
| 281 | } |
| 282 | bool operator != (const iterator& rhs) const |
| 283 | { |
| 284 | return !(operator == (rhs)); |
| 285 | } |
| 286 | iterator& operator ++ () |
| 287 | { |
| 288 | utf8::next(it, range_end); |
| 289 | return *this; |
| 290 | } |
| 291 | iterator operator ++ (int) |
| 292 | { |
| 293 | iterator temp = *this; |
| 294 | utf8::next(it, range_end); |
| 295 | return temp; |
| 296 | } |
| 297 | iterator& operator -- () |
| 298 | { |
| 299 | utf8::prior(it, range_start); |
| 300 | return *this; |
| 301 | } |
| 302 | iterator operator -- (int) |
| 303 | { |
| 304 | iterator temp = *this; |
| 305 | utf8::prior(it, range_start); |
| 306 | return temp; |
| 307 | } |