1// Debugging iterator implementation (out of line) -*- C++ -*-
2
3// Copyright (C) 2003-2026 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
34namespace __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(x: 0, y: __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(x: 1, y: __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(x: 0, y: __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(x: 1, y: __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(x: 1, y: __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(x: -1, y: __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(x: 1, y: __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(x: 0, y: __dp_exact);
203 return true;
204 }
205
206 if (_M_singular() || __rhs._M_singular() || !_M_can_compare(x: __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(x: 0, y: __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
249namespace std _GLIBCXX_VISIBILITY(default)
250{
251_GLIBCXX_BEGIN_NAMESPACE_VERSION
252
253#if __cplusplus < 201103L
254 template<typename _Ite, typename _Seq>
255 _Ite
256 __niter_base(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq,
257 std::random_access_iterator_tag>& __it)
258 { return __it.base(); }
259
260 template<typename _Ite, typename _Cont, typename _DbgSeq>
261 _Ite
262 __niter_base(const ::__gnu_debug::_Safe_iterator<
263 ::__gnu_cxx::__normal_iterator<_Ite, _Cont>, _DbgSeq,
264 std::random_access_iterator_tag>& __it)
265 { return __it.base().base(); }
266#else
267 template<typename _Ite, typename _Seq>
268 _GLIBCXX20_CONSTEXPR
269 decltype(std::__niter_base(std::declval<_Ite>()))
270 __niter_base(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq,
271 std::random_access_iterator_tag>& __it)
272 noexcept(std::is_nothrow_copy_constructible<_Ite>::value)
273 { return std::__niter_base(__it.base()); }
274#endif
275
276 template<bool _IsMove,
277 typename _Ite, typename _Seq, typename _Cat, typename _OI>
278 _GLIBCXX20_CONSTEXPR
279 _OI
280 __copy_move_a(
281 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first,
282 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __last,
283 _OI __result)
284 {
285 typename ::__gnu_debug::_Distance_traits<_Ite>::__type __dist;
286 __glibcxx_check_valid_range2(__first, __last, __dist);
287 __glibcxx_check_can_increment_dist(__result, __dist, 1);
288
289 if (__dist.second > ::__gnu_debug::__dp_equality)
290 return std::__copy_move_a<_IsMove>(__first.base(), __last.base(),
291 __result);
292
293 return std::__copy_move_a1<_IsMove>(__first, __last, __result);
294 }
295
296 template<bool _IsMove,
297 typename _II, typename _Ite, typename _Seq, typename _Cat>
298 _GLIBCXX20_CONSTEXPR
299 __gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>
300 __copy_move_a(_II __first, _II __last,
301 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __result)
302 {
303 typename ::__gnu_debug::_Distance_traits<_II>::__type __dist;
304 __glibcxx_check_valid_range2(__first, __last, __dist);
305 __glibcxx_check_can_increment_dist(__result, __dist, 1);
306
307 if (__dist.second > ::__gnu_debug::__dp_sign
308 && __result._M_can_advance(__dist.first, true))
309 return ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>(
310 std::__copy_move_a<_IsMove>(__first, __last, __result.base()),
311 __result._M_sequence);
312
313 return std::__copy_move_a1<_IsMove>(__first, __last, __result);
314 }
315
316 template<bool _IsMove,
317 typename _IIte, typename _ISeq, typename _ICat,
318 typename _OIte, typename _OSeq, typename _OCat>
319 _GLIBCXX20_CONSTEXPR
320 ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>
321 __copy_move_a(
322 const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __first,
323 const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __last,
324 const ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>& __result)
325 {
326 typename ::__gnu_debug::_Distance_traits<_IIte>::__type __dist;
327 __glibcxx_check_valid_range2(__first, __last, __dist);
328 __glibcxx_check_can_increment_dist(__result, __dist, 1);
329
330 if (__dist.second > ::__gnu_debug::__dp_equality)
331 {
332 if (__dist.second > ::__gnu_debug::__dp_sign
333 && __result._M_can_advance(__dist.first, true))
334 return ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>(
335 std::__copy_move_a<_IsMove>(__first.base(), __last.base(),
336 __result.base()),
337 __result._M_sequence);
338
339 return std::__copy_move_a<_IsMove>(__first.base(), __last.base(),
340 __result);
341 }
342
343 return std::__copy_move_a1<_IsMove>(__first, __last, __result);
344 }
345
346 template<bool _IsMove,
347 typename _Ite, typename _Seq, typename _Cat, typename _OI>
348 _GLIBCXX20_CONSTEXPR
349 _OI
350 __copy_move_backward_a(
351 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first,
352 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __last,
353 _OI __result)
354 {
355 typename ::__gnu_debug::_Distance_traits<_Ite>::__type __dist;
356 __glibcxx_check_valid_range2(__first, __last, __dist);
357 __glibcxx_check_can_increment_dist(__result, __dist, -1);
358
359 if (__dist.second > ::__gnu_debug::__dp_equality)
360 return std::__copy_move_backward_a<_IsMove>(
361 __first.base(), __last.base(), __result);
362
363 return std::__copy_move_backward_a1<_IsMove>(__first, __last, __result);
364 }
365
366 template<bool _IsMove,
367 typename _II, typename _Ite, typename _Seq, typename _Cat>
368 _GLIBCXX20_CONSTEXPR
369 __gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>
370 __copy_move_backward_a(_II __first, _II __last,
371 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __result)
372 {
373 typename ::__gnu_debug::_Distance_traits<_II>::__type __dist;
374 __glibcxx_check_valid_range2(__first, __last, __dist);
375 __glibcxx_check_can_increment_dist(__result, __dist, -1);
376
377 if (__dist.second > ::__gnu_debug::__dp_sign
378 && __result._M_can_advance(-__dist.first, true))
379 return ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>(
380 std::__copy_move_backward_a<_IsMove>(__first, __last,
381 __result.base()),
382 __result._M_sequence);
383
384 return std::__copy_move_backward_a1<_IsMove>(__first, __last, __result);
385 }
386
387 template<bool _IsMove,
388 typename _IIte, typename _ISeq, typename _ICat,
389 typename _OIte, typename _OSeq, typename _OCat>
390 _GLIBCXX20_CONSTEXPR
391 ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>
392 __copy_move_backward_a(
393 const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __first,
394 const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __last,
395 const ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>& __result)
396 {
397 typename ::__gnu_debug::_Distance_traits<_IIte>::__type __dist;
398 __glibcxx_check_valid_range2(__first, __last, __dist);
399 __glibcxx_check_can_increment_dist(__result, __dist, -1);
400
401 if (__dist.second > ::__gnu_debug::__dp_equality)
402 {
403 if (__dist.second > ::__gnu_debug::__dp_sign
404 && __result._M_can_advance(-__dist.first, true))
405 return ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>(
406 std::__copy_move_backward_a<_IsMove>(__first.base(), __last.base(),
407 __result.base()),
408 __result._M_sequence);
409
410 return std::__copy_move_backward_a<_IsMove>(
411 __first.base(), __last.base(), __result);
412 }
413
414 return std::__copy_move_backward_a1<_IsMove>(__first, __last, __result);
415 }
416
417 template<typename _Ite, typename _Seq, typename _Cat, typename _Tp>
418 _GLIBCXX20_CONSTEXPR
419 void
420 __fill_a(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first,
421 const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __last,
422 const _Tp& __value)
423 {
424 typename ::__gnu_debug::_Distance_traits<_Ite>::__type __dist;
425 __glibcxx_check_valid_range2(__first, __last, __dist);
426
427 if (__dist.second > ::__gnu_debug::__dp_equality)
428 std::__fill_a(__first.base(), __last.base(), __value);
429
430 std::__fill_a1(__first, __last, __value);
431 }
432
433 template<typename _Ite, typename _Seq, typename _Cat, typename _Size,
434 typename _Tp>
435 _GLIBCXX20_CONSTEXPR
436 ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>
437 __fill_n_a(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first,
438 _Size __n, const _Tp& __value,
439 std::input_iterator_tag)
440 {
441#if __cplusplus >= 201103L
442 static_assert(is_integral<_Size>{}, "fill_n must pass integral size");
443#endif
444
445 if (__n <= 0)
446 return __first;
447
448 __glibcxx_check_can_increment(__first, __n);
449 if (__first._M_can_advance(__n, true))
450 return ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>(
451 std::__fill_n_a(__first.base(), __n, __value, _Cat()),
452 __first._M_sequence);
453
454 return std::__fill_n_a1(__first, __n, __value);
455 }
456
457 template<typename _II1, typename _Seq1, typename _Cat1, typename _II2>
458 _GLIBCXX20_CONSTEXPR
459 bool
460 __equal_aux(
461 const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __first1,
462 const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __last1,
463 _II2 __first2)
464 {
465 typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist;
466 __glibcxx_check_valid_range2(__first1, __last1, __dist);
467 __glibcxx_check_can_increment_dist(__first2, __dist, 1);
468
469 if (__dist.second > ::__gnu_debug::__dp_equality)
470 return std::__equal_aux(__first1.base(), __last1.base(), __first2);
471
472 return std::__equal_aux1(__first1, __last1, __first2);
473 }
474
475 template<typename _II1, typename _II2, typename _Seq2, typename _Cat2>
476 _GLIBCXX20_CONSTEXPR
477 bool
478 __equal_aux(_II1 __first1, _II1 __last1,
479 const ::__gnu_debug::_Safe_iterator<_II2, _Seq2, _Cat2>& __first2)
480 {
481 typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist;
482 __glibcxx_check_valid_range2(__first1, __last1, __dist);
483 __glibcxx_check_can_increment_dist(__first2, __dist, 1);
484
485 if (__dist.second > ::__gnu_debug::__dp_sign
486 && __first2._M_can_advance(__dist.first, true))
487 return std::__equal_aux(__first1, __last1, __first2.base());
488
489 return std::__equal_aux1(__first1, __last1, __first2);
490 }
491
492 template<typename _II1, typename _Seq1, typename _Cat1,
493 typename _II2, typename _Seq2, typename _Cat2>
494 _GLIBCXX20_CONSTEXPR
495 bool
496 __equal_aux(
497 const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __first1,
498 const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __last1,
499 const ::__gnu_debug::_Safe_iterator<_II2, _Seq2, _Cat2>& __first2)
500 {
501 typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist;
502 __glibcxx_check_valid_range2(__first1, __last1, __dist);
503 __glibcxx_check_can_increment_dist(__first2, __dist, 1);
504
505 if (__dist.second > ::__gnu_debug::__dp_equality)
506 {
507 if (__dist.second > ::__gnu_debug::__dp_sign &&
508 __first2._M_can_advance(__dist.first, true))
509 return std::__equal_aux(__first1.base(), __last1.base(),
510 __first2.base());
511 return std::__equal_aux(__first1.base(), __last1.base(), __first2);
512 }
513
514 return __equal_aux1(__first1, __last1, __first2);
515 }
516
517 template<typename _Ite1, typename _Seq1, typename _Cat1,
518 typename _II2>
519 _GLIBCXX20_CONSTEXPR
520 bool
521 __lexicographical_compare_aux(
522 const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __first1,
523 const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __last1,
524 _II2 __first2, _II2 __last2)
525 {
526 typename ::__gnu_debug::_Distance_traits<_Ite1>::__type __dist1;
527 __glibcxx_check_valid_range2(__first1, __last1, __dist1);
528 __glibcxx_check_valid_range(__first2, __last2);
529
530 if (__dist1.second > ::__gnu_debug::__dp_equality)
531 return std::__lexicographical_compare_aux(__first1.base(),
532 __last1.base(),
533 __first2, __last2);
534 return std::__lexicographical_compare_aux1(__first1, __last1,
535 __first2, __last2);
536 }
537
538 template<typename _II1,
539 typename _Ite2, typename _Seq2, typename _Cat2>
540 _GLIBCXX20_CONSTEXPR
541 bool
542 __lexicographical_compare_aux(
543 _II1 __first1, _II1 __last1,
544 const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __first2,
545 const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __last2)
546 {
547 __glibcxx_check_valid_range(__first1, __last1);
548 typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist2;
549 __glibcxx_check_valid_range2(__first2, __last2, __dist2);
550
551 if (__dist2.second > ::__gnu_debug::__dp_equality)
552 return std::__lexicographical_compare_aux(__first1, __last1,
553 __first2.base(),
554 __last2.base());
555 return std::__lexicographical_compare_aux1(__first1, __last1,
556 __first2, __last2);
557 }
558
559 template<typename _Ite1, typename _Seq1, typename _Cat1,
560 typename _Ite2, typename _Seq2, typename _Cat2>
561 _GLIBCXX20_CONSTEXPR
562 bool
563 __lexicographical_compare_aux(
564 const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __first1,
565 const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __last1,
566 const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __first2,
567 const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __last2)
568 {
569 typename ::__gnu_debug::_Distance_traits<_Ite1>::__type __dist1;
570 __glibcxx_check_valid_range2(__first1, __last1, __dist1);
571 typename ::__gnu_debug::_Distance_traits<_Ite2>::__type __dist2;
572 __glibcxx_check_valid_range2(__first2, __last2, __dist2);
573
574 if (__dist1.second > ::__gnu_debug::__dp_equality)
575 {
576 if (__dist2.second > ::__gnu_debug::__dp_equality)
577 return std::__lexicographical_compare_aux(__first1.base(),
578 __last1.base(),
579 __first2.base(),
580 __last2.base());
581 return std::__lexicographical_compare_aux(__first1.base(),
582 __last1.base(),
583 __first2, __last2);
584 }
585
586 if (__dist2.second > ::__gnu_debug::__dp_equality)
587 return std::__lexicographical_compare_aux(__first1, __last1,
588 __first2.base(),
589 __last2.base());
590 return std::__lexicographical_compare_aux1(__first1, __last1,
591 __first2, __last2);
592 }
593
594_GLIBCXX_END_NAMESPACE_VERSION
595} // namespace std
596
597#endif
598