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The C and C++ Include Header Files
/usr/include/c++/13/debug/safe_iterator.tcc
$ cat -n /usr/include/c++/13/debug/safe_iterator.tcc 1 // Debugging iterator implementation (out of line) -*- C++ -*- 2 3 // Copyright (C) 2003-2023 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 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU 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 debug/safe_iterator.tcc 26 * This file is a GNU debug extension to the Standard C++ Library. 27 */ 28 29 #ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 30 #define _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 1 31 32 #include <bits/stl_algobase.h> 33 34 namespace __gnu_debug 35 { 36 template<typename _Iterator, typename _Sequence, typename _Category> 37 typename _Distance_traits<_Iterator>::__type 38 _Safe_iterator<_Iterator, _Sequence, _Category>:: 39 _M_get_distance_from_begin() const 40 { 41 typedef _Sequence_traits<_Sequence> _SeqTraits; 42 43 // No need to consider before_begin as this function is only used in 44 // _M_can_advance which won't be used for forward_list iterators. 45 if (_M_is_begin()) 46 return std::make_pair(0, __dp_exact); 47 48 if (_M_is_end()) 49 return _SeqTraits::_S_size(*_M_get_sequence()); 50 51 typename _Distance_traits<_Iterator>::__type __res 52 = __get_distance(_M_get_sequence()->_M_base().begin(), base()); 53 54 if (__res.second == __dp_equality) 55 return std::make_pair(1, __dp_sign); 56 57 return __res; 58 } 59 60 template<typename _Iterator, typename _Sequence, typename _Category> 61 typename _Distance_traits<_Iterator>::__type 62 _Safe_iterator<_Iterator, _Sequence, _Category>:: 63 _M_get_distance_to_end() const 64 { 65 typedef _Sequence_traits<_Sequence> _SeqTraits; 66 67 // No need to consider before_begin as this function is only used in 68 // _M_can_advance which won't be used for forward_list iterators. 69 if (_M_is_begin()) 70 return _SeqTraits::_S_size(*_M_get_sequence()); 71 72 if (_M_is_end()) 73 return std::make_pair(0, __dp_exact); 74 75 typename _Distance_traits<_Iterator>::__type __res 76 = __get_distance(base(), _M_get_sequence()->_M_base().end()); 77 78 if (__res.second == __dp_equality) 79 return std::make_pair(1, __dp_sign); 80 81 return __res; 82 } 83 84 template<typename _Iterator, typename _Sequence, typename _Category> 85 bool 86 _Safe_iterator<_Iterator, _Sequence, _Category>:: 87 _M_can_advance(difference_type __n, bool __strict) const 88 { 89 if (this->_M_value_initialized() && __n == 0) 90 return true; 91 92 if (this->_M_singular()) 93 return false; 94 95 if (__n == 0) 96 return true; 97 98 std::pair<difference_type, _Distance_precision> __dist = __n < 0 99 ? _M_get_distance_from_begin() 100 : _M_get_distance_to_end(); 101 102 if (__n < 0) 103 __n = -__n; 104 105 return __dist.second > __dp_sign 106 ? __dist.first >= __n 107 : !__strict && __dist.first > 0; 108 } 109 110 template<typename _Iterator, typename _Sequence, typename _Category> 111 template<typename _Diff> 112 bool 113 _Safe_iterator<_Iterator, _Sequence, _Category>:: 114 _M_can_advance(const std::pair<_Diff, _Distance_precision>& __dist, 115 int __way) const 116 { 117 return __dist.second == __dp_exact 118 ? _M_can_advance(__way * __dist.first) 119 : _M_can_advance(__way * (__dist.first == 0 120 ? 0 121 : __dist.first < 0 ? -1 : 1)); 122 } 123 124 template<typename _Iterator, typename _Sequence, typename _Category> 125 typename _Distance_traits<_Iterator>::__type 126 _Safe_iterator<_Iterator, _Sequence, _Category>:: 127 _M_get_distance_to(const _Safe_iterator& __rhs) const 128 { 129 typedef typename _Distance_traits<_Iterator>::__type _Dist; 130 typedef _Sequence_traits<_Sequence> _SeqTraits; 131 132 _Dist __base_dist = __get_distance(this->base(), __rhs.base()); 133 if (__base_dist.second == __dp_exact) 134 return __base_dist; 135 136 _Dist __seq_dist = _SeqTraits::_S_size(*this->_M_get_sequence()); 137 if (this->_M_is_before_begin()) 138 { 139 if (__rhs._M_is_begin()) 140 return std::make_pair(1, __dp_exact); 141 142 return __seq_dist.second == __dp_exact 143 ? std::make_pair(__seq_dist.first + 1, __dp_exact) 144 : __seq_dist; 145 } 146 147 if (this->_M_is_begin()) 148 { 149 if (__rhs._M_is_before_begin()) 150 return std::make_pair(-1, __dp_exact); 151 152 if (__rhs._M_is_end()) 153 return __seq_dist; 154 155 return std::make_pair(__seq_dist.first, 156 __seq_dist.second == __dp_exact 157 ? __dp_sign_max_size : __seq_dist.second); 158 } 159 160 if (this->_M_is_end()) 161 { 162 if (__rhs._M_is_before_begin()) 163 return __seq_dist.second == __dp_exact 164 ? std::make_pair(-__seq_dist.first - 1, __dp_exact) 165 : std::make_pair(-__seq_dist.first, __dp_sign); 166 167 if (__rhs._M_is_begin()) 168 return std::make_pair(-__seq_dist.first, __seq_dist.second); 169 170 return std::make_pair(-__seq_dist.first, 171 __seq_dist.second == __dp_exact 172 ? __dp_sign_max_size : __seq_dist.second); 173 } 174 175 if (__rhs._M_is_before_begin()) 176 return __seq_dist.second == __dp_exact 177 ? std::make_pair(__seq_dist.first - 1, __dp_exact) 178 : std::make_pair(-__seq_dist.first, __dp_sign); 179 180 if (__rhs._M_is_begin()) 181 return std::make_pair(-__seq_dist.first, 182 __seq_dist.second == __dp_exact 183 ? __dp_sign_max_size : __seq_dist.second); 184 185 if (__rhs._M_is_end()) 186 return std::make_pair(__seq_dist.first, 187 __seq_dist.second == __dp_exact 188 ? __dp_sign_max_size : __seq_dist.second); 189 190 return std::make_pair(1, __dp_equality); 191 } 192 193 template<typename _Iterator, typename _Sequence, typename _Category> 194 bool 195 _Safe_iterator<_Iterator, _Sequence, _Category>:: 196 _M_valid_range(const _Safe_iterator& __rhs, 197 std::pair<difference_type, _Distance_precision>& __dist, 198 bool __check_dereferenceable) const 199 { 200 if (_M_value_initialized() && __rhs._M_value_initialized()) 201 { 202 __dist = std::make_pair(0, __dp_exact); 203 return true; 204 } 205 206 if (_M_singular() || __rhs._M_singular() || !_M_can_compare(__rhs)) 207 return false; 208 209 /* Determine iterators order */ 210 __dist = _M_get_distance_to(__rhs); 211 if (__dist.second != __dp_equality) 212 { 213 // If range is not empty first iterator must be dereferenceable. 214 return __dist.first == 0 215 || (__dist.first > 0 216 && (!__check_dereferenceable || _M_dereferenceable())); 217 } 218 219 // Assume that this is a valid range; we can't check anything else. 220 return true; 221 } 222 223 template<typename _Iterator, typename _Sequence> 224 bool 225 _Safe_iterator<_Iterator, _Sequence, std::random_access_iterator_tag>:: 226 _M_valid_range(const _Safe_iterator& __rhs, 227 std::pair<difference_type, 228 _Distance_precision>& __dist) const 229 { 230 if (this->_M_value_initialized() && __rhs._M_value_initialized()) 231 { 232 __dist = std::make_pair(0, __dp_exact); 233 return true; 234 } 235 236 if (this->_M_singular() || __rhs._M_singular() 237 || !this->_M_can_compare(__rhs)) 238 return false; 239 240 /* Determine iterators order */ 241 __dist = std::make_pair(__rhs.base() - this->base(), __dp_exact); 242 243 // If range is not empty first iterator must be dereferenceable. 244 return __dist.first == 0 245 || (__dist.first > 0 && this->_M_dereferenceable()); 246 } 247 } // namespace __gnu_debug 248 249 namespace std _GLIBCXX_VISIBILITY(default) 250 { 251 _GLIBCXX_BEGIN_NAMESPACE_VERSION 252 253 template<typename _Ite, typename _Seq> 254 _Ite 255 __niter_base(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, 256 std::random_access_iterator_tag>& __it) 257 { return __it.base(); } 258 259 template<bool _IsMove, 260 typename _Ite, typename _Seq, typename _Cat, typename _OI> 261 _OI 262 __copy_move_a( 263 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first, 264 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __last, 265 _OI __result) 266 { 267 typename ::__gnu_debug::_Distance_traits<_Ite>::__type __dist; 268 __glibcxx_check_valid_range2(__first, __last, __dist); 269 __glibcxx_check_can_increment_dist(__result, __dist, 1); 270 271 if (__dist.second > ::__gnu_debug::__dp_equality) 272 return std::__copy_move_a<_IsMove>(__first.base(), __last.base(), 273 __result); 274 275 return std::__copy_move_a1<_IsMove>(__first, __last, __result); 276 } 277 278 template<bool _IsMove, 279 typename _II, typename _Ite, typename _Seq, typename _Cat> 280 __gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat> 281 __copy_move_a(_II __first, _II __last, 282 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __result) 283 { 284 typename ::__gnu_debug::_Distance_traits<_II>::__type __dist; 285 __glibcxx_check_valid_range2(__first, __last, __dist); 286 __glibcxx_check_can_increment_dist(__result, __dist, 1); 287 288 if (__dist.second > ::__gnu_debug::__dp_sign 289 && __result._M_can_advance(__dist.first, true)) 290 return ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>( 291 std::__copy_move_a<_IsMove>(__first, __last, __result.base()), 292 __result._M_sequence); 293 294 return std::__copy_move_a1<_IsMove>(__first, __last, __result); 295 } 296 297 template<bool _IsMove, 298 typename _IIte, typename _ISeq, typename _ICat, 299 typename _OIte, typename _OSeq, typename _OCat> 300 ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat> 301 __copy_move_a( 302 const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __first, 303 const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __last, 304 const ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>& __result) 305 { 306 typename ::__gnu_debug::_Distance_traits<_IIte>::__type __dist; 307 __glibcxx_check_valid_range2(__first, __last, __dist); 308 __glibcxx_check_can_increment_dist(__result, __dist, 1); 309 310 if (__dist.second > ::__gnu_debug::__dp_equality) 311 { 312 if (__dist.second > ::__gnu_debug::__dp_sign 313 && __result._M_can_advance(__dist.first, true)) 314 return ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>( 315 std::__copy_move_a<_IsMove>(__first.base(), __last.base(), 316 __result.base()), 317 __result._M_sequence); 318 319 return std::__copy_move_a<_IsMove>(__first.base(), __last.base(), 320 __result); 321 } 322 323 return std::__copy_move_a1<_IsMove>(__first, __last, __result); 324 } 325 326 template<bool _IsMove, 327 typename _Ite, typename _Seq, typename _Cat, typename _OI> 328 _OI 329 __copy_move_backward_a( 330 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first, 331 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __last, 332 _OI __result) 333 { 334 typename ::__gnu_debug::_Distance_traits<_Ite>::__type __dist; 335 __glibcxx_check_valid_range2(__first, __last, __dist); 336 __glibcxx_check_can_increment_dist(__result, __dist, -1); 337 338 if (__dist.second > ::__gnu_debug::__dp_equality) 339 return std::__copy_move_backward_a<_IsMove>( 340 __first.base(), __last.base(), __result); 341 342 return std::__copy_move_backward_a1<_IsMove>(__first, __last, __result); 343 } 344 345 template<bool _IsMove, 346 typename _II, typename _Ite, typename _Seq, typename _Cat> 347 __gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat> 348 __copy_move_backward_a(_II __first, _II __last, 349 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __result) 350 { 351 typename ::__gnu_debug::_Distance_traits<_II>::__type __dist; 352 __glibcxx_check_valid_range2(__first, __last, __dist); 353 __glibcxx_check_can_increment_dist(__result, __dist, -1); 354 355 if (__dist.second > ::__gnu_debug::__dp_sign 356 && __result._M_can_advance(-__dist.first, true)) 357 return ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>( 358 std::__copy_move_backward_a<_IsMove>(__first, __last, 359 __result.base()), 360 __result._M_sequence); 361 362 return std::__copy_move_backward_a1<_IsMove>(__first, __last, __result); 363 } 364 365 template<bool _IsMove, 366 typename _IIte, typename _ISeq, typename _ICat, 367 typename _OIte, typename _OSeq, typename _OCat> 368 ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat> 369 __copy_move_backward_a( 370 const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __first, 371 const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __last, 372 const ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>& __result) 373 { 374 typename ::__gnu_debug::_Distance_traits<_IIte>::__type __dist; 375 __glibcxx_check_valid_range2(__first, __last, __dist); 376 __glibcxx_check_can_increment_dist(__result, __dist, -1); 377 378 if (__dist.second > ::__gnu_debug::__dp_equality) 379 { 380 if (__dist.second > ::__gnu_debug::__dp_sign 381 && __result._M_can_advance(-__dist.first, true)) 382 return ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>( 383 std::__copy_move_backward_a<_IsMove>(__first.base(), __last.base(), 384 __result.base()), 385 __result._M_sequence); 386 387 return std::__copy_move_backward_a<_IsMove>( 388 __first.base(), __last.base(), __result); 389 } 390 391 return std::__copy_move_backward_a1<_IsMove>(__first, __last, __result); 392 } 393 394 template<typename _Ite, typename _Seq, typename _Cat, typename _Tp> 395 void 396 __fill_a(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first, 397 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __last, 398 const _Tp& __value) 399 { 400 typename ::__gnu_debug::_Distance_traits<_Ite>::__type __dist; 401 __glibcxx_check_valid_range2(__first, __last, __dist); 402 403 if (__dist.second > ::__gnu_debug::__dp_equality) 404 std::__fill_a(__first.base(), __last.base(), __value); 405 406 std::__fill_a1(__first, __last, __value); 407 } 408 409 template<typename _Ite, typename _Seq, typename _Cat, typename _Size, 410 typename _Tp> 411 ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat> 412 __fill_n_a(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first, 413 _Size __n, const _Tp& __value, 414 std::input_iterator_tag) 415 { 416 #if __cplusplus >= 201103L 417 static_assert(is_integral<_Size>{}, "fill_n must pass integral size"); 418 #endif 419 420 if (__n <= 0) 421 return __first; 422 423 __glibcxx_check_can_increment(__first, __n); 424 if (__first._M_can_advance(__n, true)) 425 return ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>( 426 std::__fill_n_a(__first.base(), __n, __value, _Cat()), 427 __first._M_sequence); 428 429 return std::__fill_n_a1(__first, __n, __value); 430 } 431 432 template<typename _II1, typename _Seq1, typename _Cat1, typename _II2> 433 bool 434 __equal_aux( 435 const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __first1, 436 const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __last1, 437 _II2 __first2) 438 { 439 typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist; 440 __glibcxx_check_valid_range2(__first1, __last1, __dist); 441 __glibcxx_check_can_increment_dist(__first2, __dist, 1); 442 443 if (__dist.second > ::__gnu_debug::__dp_equality) 444 return std::__equal_aux(__first1.base(), __last1.base(), __first2); 445 446 return std::__equal_aux1(__first1, __last1, __first2); 447 } 448 449 template<typename _II1, typename _II2, typename _Seq2, typename _Cat2> 450 bool 451 __equal_aux(_II1 __first1, _II1 __last1, 452 const ::__gnu_debug::_Safe_iterator<_II2, _Seq2, _Cat2>& __first2) 453 { 454 typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist; 455 __glibcxx_check_valid_range2(__first1, __last1, __dist); 456 __glibcxx_check_can_increment_dist(__first2, __dist, 1); 457 458 if (__dist.second > ::__gnu_debug::__dp_sign 459 && __first2._M_can_advance(__dist.first, true)) 460 return std::__equal_aux(__first1, __last1, __first2.base()); 461 462 return std::__equal_aux1(__first1, __last1, __first2); 463 } 464 465 template<typename _II1, typename _Seq1, typename _Cat1, 466 typename _II2, typename _Seq2, typename _Cat2> 467 bool 468 __equal_aux( 469 const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __first1, 470 const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __last1, 471 const ::__gnu_debug::_Safe_iterator<_II2, _Seq2, _Cat2>& __first2) 472 { 473 typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist; 474 __glibcxx_check_valid_range2(__first1, __last1, __dist); 475 __glibcxx_check_can_increment_dist(__first2, __dist, 1); 476 477 if (__dist.second > ::__gnu_debug::__dp_equality) 478 { 479 if (__dist.second > ::__gnu_debug::__dp_sign && 480 __first2._M_can_advance(__dist.first, true)) 481 return std::__equal_aux(__first1.base(), __last1.base(), 482 __first2.base()); 483 return std::__equal_aux(__first1.base(), __last1.base(), __first2); 484 } 485 486 return __equal_aux1(__first1, __last1, __first2); 487 } 488 489 template<typename _Ite1, typename _Seq1, typename _Cat1, 490 typename _II2> 491 bool 492 __lexicographical_compare_aux( 493 const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __first1, 494 const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __last1, 495 _II2 __first2, _II2 __last2) 496 { 497 typename ::__gnu_debug::_Distance_traits<_Ite1>::__type __dist1; 498 __glibcxx_check_valid_range2(__first1, __last1, __dist1); 499 __glibcxx_check_valid_range(__first2, __last2); 500 501 if (__dist1.second > ::__gnu_debug::__dp_equality) 502 return std::__lexicographical_compare_aux(__first1.base(), 503 __last1.base(), 504 __first2, __last2); 505 return std::__lexicographical_compare_aux1(__first1, __last1, 506 __first2, __last2); 507 } 508 509 template<typename _II1, 510 typename _Ite2, typename _Seq2, typename _Cat2> 511 bool 512 __lexicographical_compare_aux( 513 _II1 __first1, _II1 __last1, 514 const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __first2, 515 const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __last2) 516 { 517 __glibcxx_check_valid_range(__first1, __last1); 518 typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist2; 519 __glibcxx_check_valid_range2(__first2, __last2, __dist2); 520 521 if (__dist2.second > ::__gnu_debug::__dp_equality) 522 return std::__lexicographical_compare_aux(__first1, __last1, 523 __first2.base(), 524 __last2.base()); 525 return std::__lexicographical_compare_aux1(__first1, __last1, 526 __first2, __last2); 527 } 528 529 template<typename _Ite1, typename _Seq1, typename _Cat1, 530 typename _Ite2, typename _Seq2, typename _Cat2> 531 bool 532 __lexicographical_compare_aux( 533 const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __first1, 534 const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __last1, 535 const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __first2, 536 const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __last2) 537 { 538 typename ::__gnu_debug::_Distance_traits<_Ite1>::__type __dist1; 539 __glibcxx_check_valid_range2(__first1, __last1, __dist1); 540 typename ::__gnu_debug::_Distance_traits<_Ite2>::__type __dist2; 541 __glibcxx_check_valid_range2(__first2, __last2, __dist2); 542 543 if (__dist1.second > ::__gnu_debug::__dp_equality) 544 { 545 if (__dist2.second > ::__gnu_debug::__dp_equality) 546 return std::__lexicographical_compare_aux(__first1.base(), 547 __last1.base(), 548 __first2.base(), 549 __last2.base()); 550 return std::__lexicographical_compare_aux(__first1.base(), 551 __last1.base(), 552 __first2, __last2); 553 } 554 555 if (__dist2.second > ::__gnu_debug::__dp_equality) 556 return std::__lexicographical_compare_aux(__first1, __last1, 557 __first2.base(), 558 __last2.base()); 559 return std::__lexicographical_compare_aux1(__first1, __last1, 560 __first2, __last2); 561 } 562 563 _GLIBCXX_END_NAMESPACE_VERSION 564 } // namespace std 565 566 #endif
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