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1 742 jeremybenn 
// Safe iterator implementation  -*- C++ -*-
2 
 
3 
// Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010, 2011
4 
// Free Software Foundation, Inc.
5 
//
6 
// This file is part of the GNU ISO C++ Library.  This library is free
7 
// software; you can redistribute it and/or modify it under the
8 
// terms of the GNU General Public License as published by the
9 
// Free Software Foundation; either version 3, or (at your option)
10 
// any later version.
11 
 
12 
// This library is distributed in the hope that it will be useful,
13 
// but WITHOUT ANY WARRANTY; without even the implied warranty of
14 
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 
// GNU General Public License for more details.
16 
 
17 
// Under Section 7 of GPL version 3, you are granted additional
18 
// permissions described in the GCC Runtime Library Exception, version
19 
// 3.1, as published by the Free Software Foundation.
20 
 
21 
// You should have received a copy of the GNU General Public License and
22 
// a copy of the GCC Runtime Library Exception along with this program;
23 
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24 
// <http://www.gnu.org/licenses/>.
25 
 
26 
/** @file debug/safe_iterator.h
27 
 *  This file is a GNU debug extension to the Standard C++ Library.
28 
 */
29 
 
30 
#ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_H
31 
#define _GLIBCXX_DEBUG_SAFE_ITERATOR_H 1
32 
 
33 
#include <debug/debug.h>
34 
#include <debug/macros.h>
35 
#include <debug/functions.h>
36 
#include <debug/safe_base.h>
37 
#include <bits/stl_pair.h>
38 
#include <bits/stl_iterator_base_types.h> // for _Iter_base
39 
#include <ext/type_traits.h>
40 
 
41 
namespace __gnu_debug
42 
{
43 
  /** Helper struct to deal with sequence offering a before_begin
44 
   *  iterator.
45 
   **/
46 
  template <typename _Sequence>
47 
    struct _BeforeBeginHelper
48 
    {
49 
      typedef typename _Sequence::const_iterator _It;
50 
      typedef typename _It::iterator_type _BaseIt;
51 
 
52 
      static bool
53 
      _M_Is(_BaseIt __it, const _Sequence* __seq)
54 
      { return false; }
55 
    };
56 
 
57 
  /** Iterators that derive from _Safe_iterator_base but that aren't
58 
   *  _Safe_iterators can be determined singular or non-singular via
59 
   *  _Safe_iterator_base.
60 
   */
61 
  inline bool
62 
  __check_singular_aux(const _Safe_iterator_base* __x)
63 
  { return __x->_M_singular(); }
64 
 
65 
  /** The precision to which we can calculate the distance between
66 
   *  two iterators.
67 
   */
68 
  enum _Distance_precision
69 
    {
70 
      __dp_equality, //< Can compare iterator equality, only
71 
      __dp_sign,     //< Can determine equality and ordering
72 
      __dp_exact     //< Can determine distance precisely
73 
    };
74 
 
75 
  /** Determine the distance between two iterators with some known
76 
   *    precision.
77 
  */
78 
  template<typename _Iterator1, typename _Iterator2>
79 
    inline std::pair<typename std::iterator_traits<_Iterator1>::difference_type,
80 
                     _Distance_precision>
81 
    __get_distance(const _Iterator1& __lhs, const _Iterator2& __rhs,
82 
                   std::random_access_iterator_tag)
83 
    { return std::make_pair(__rhs - __lhs, __dp_exact); }
84 
 
85 
  template<typename _Iterator1, typename _Iterator2>
86 
    inline std::pair<typename std::iterator_traits<_Iterator1>::difference_type,
87 
                     _Distance_precision>
88 
    __get_distance(const _Iterator1& __lhs, const _Iterator2& __rhs,
89 
                   std::forward_iterator_tag)
90 
    { return std::make_pair(__lhs == __rhs? 0 : 1, __dp_equality); }
91 
 
92 
  template<typename _Iterator1, typename _Iterator2>
93 
    inline std::pair<typename std::iterator_traits<_Iterator1>::difference_type,
94 
                     _Distance_precision>
95 
    __get_distance(const _Iterator1& __lhs, const _Iterator2& __rhs)
96 
    {
97 
      typedef typename std::iterator_traits<_Iterator1>::iterator_category
98 
          _Category;
99 
      return __get_distance(__lhs, __rhs, _Category());
100 
    }
101 
 
102 
  /** \brief Safe iterator wrapper.
103 
   *
104 
   *  The class template %_Safe_iterator is a wrapper around an
105 
   *  iterator that tracks the iterator's movement among sequences and
106 
   *  checks that operations performed on the "safe" iterator are
107 
   *  legal. In additional to the basic iterator operations (which are
108 
   *  validated, and then passed to the underlying iterator),
109 
   *  %_Safe_iterator has member functions for iterator invalidation,
110 
   *  attaching/detaching the iterator from sequences, and querying
111 
   *  the iterator's state.
112 
   */
113 
  template<typename _Iterator, typename _Sequence>
114 
    class _Safe_iterator : public _Safe_iterator_base
115 
    {
116 
      typedef _Safe_iterator _Self;
117 
 
118 
      /// The underlying iterator
119 
      _Iterator _M_current;
120 
 
121 
      /// Determine if this is a constant iterator.
122 
      bool
123 
      _M_constant() const
124 
      {
125 
        typedef typename _Sequence::const_iterator const_iterator;
126 
        return std::__are_same<const_iterator, _Safe_iterator>::__value;
127 
      }
128 
 
129 
      typedef std::iterator_traits<_Iterator> _Traits;
130 
 
131 
    public:
132 
      typedef _Iterator                           iterator_type;
133 
      typedef typename _Traits::iterator_category iterator_category;
134 
      typedef typename _Traits::value_type        value_type;
135 
      typedef typename _Traits::difference_type   difference_type;
136 
      typedef typename _Traits::reference         reference;
137 
      typedef typename _Traits::pointer           pointer;
138 
 
139 
      /// @post the iterator is singular and unattached
140 
      _Safe_iterator() : _M_current() { }
141 
 
142 
      /**
143 
       * @brief Safe iterator construction from an unsafe iterator and
144 
       * its sequence.
145 
       *
146 
       * @pre @p seq is not NULL
147 
       * @post this is not singular
148 
       */
149 
      _Safe_iterator(const _Iterator& __i, const _Sequence* __seq)
150 
      : _Safe_iterator_base(__seq, _M_constant()), _M_current(__i)
151 
      {
152 
        _GLIBCXX_DEBUG_VERIFY(! this->_M_singular(),
153 
                              _M_message(__msg_init_singular)
154 
                              ._M_iterator(*this, "this"));
155 
      }
156 
 
157 
      /**
158 
       * @brief Copy construction.
159 
       */
160 
      _Safe_iterator(const _Safe_iterator& __x)
161 
      : _Safe_iterator_base(__x, _M_constant()), _M_current(__x._M_current)
162 
      {
163 
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
164 
        // DR 408. Is vector<reverse_iterator<char*> > forbidden?
165 
        _GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
166 
                              || __x._M_current == _Iterator(),
167 
                              _M_message(__msg_init_copy_singular)
168 
                              ._M_iterator(*this, "this")
169 
                              ._M_iterator(__x, "other"));
170 
      }
171 
 
172 
      /**
173 
       *  @brief Converting constructor from a mutable iterator to a
174 
       *  constant iterator.
175 
      */
176 
      template<typename _MutableIterator>
177 
        _Safe_iterator(
178 
          const _Safe_iterator<_MutableIterator,
179 
          typename __gnu_cxx::__enable_if<(std::__are_same<_MutableIterator,
180 
                      typename _Sequence::iterator::iterator_type>::__value),
181 
                   _Sequence>::__type>& __x)
182 
        : _Safe_iterator_base(__x, _M_constant()), _M_current(__x.base())
183 
        {
184 
          // _GLIBCXX_RESOLVE_LIB_DEFECTS
185 
          // DR 408. Is vector<reverse_iterator<char*> > forbidden?
186 
          _GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
187 
                                || __x.base() == _Iterator(),
188 
                                _M_message(__msg_init_const_singular)
189 
                                ._M_iterator(*this, "this")
190 
                                ._M_iterator(__x, "other"));
191 
        }
192 
 
193 
      /**
194 
       * @brief Copy assignment.
195 
       */
196 
      _Safe_iterator&
197 
      operator=(const _Safe_iterator& __x)
198 
      {
199 
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
200 
        // DR 408. Is vector<reverse_iterator<char*> > forbidden?
201 
        _GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
202 
                              || __x._M_current == _Iterator(),
203 
                              _M_message(__msg_copy_singular)
204 
                              ._M_iterator(*this, "this")
205 
                              ._M_iterator(__x, "other"));
206 
        _M_current = __x._M_current;
207 
        this->_M_attach(__x._M_sequence);
208 
        return *this;
209 
      }
210 
 
211 
      /**
212 
       *  @brief Iterator dereference.
213 
       *  @pre iterator is dereferenceable
214 
       */
215 
      reference
216 
      operator*() const
217 
      {
218 
        _GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(),
219 
                              _M_message(__msg_bad_deref)
220 
                              ._M_iterator(*this, "this"));
221 
        return *_M_current;
222 
      }
223 
 
224 
      /**
225 
       *  @brief Iterator dereference.
226 
       *  @pre iterator is dereferenceable
227 
       *  @todo Make this correct w.r.t. iterators that return proxies
228 
       *  @todo Use addressof() instead of & operator
229 
       */
230 
      pointer
231 
      operator->() const
232 
      {
233 
        _GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(),
234 
                              _M_message(__msg_bad_deref)
235 
                              ._M_iterator(*this, "this"));
236 
        return &*_M_current;
237 
      }
238 
 
239 
      // ------ Input iterator requirements ------
240 
      /**
241 
       *  @brief Iterator preincrement
242 
       *  @pre iterator is incrementable
243 
       */
244 
      _Safe_iterator&
245 
      operator++()
246 
      {
247 
        _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
248 
                              _M_message(__msg_bad_inc)
249 
                              ._M_iterator(*this, "this"));
250 
        ++_M_current;
251 
        return *this;
252 
      }
253 
 
254 
      /**
255 
       *  @brief Iterator postincrement
256 
       *  @pre iterator is incrementable
257 
       */
258 
      _Safe_iterator
259 
      operator++(int)
260 
      {
261 
        _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
262 
                              _M_message(__msg_bad_inc)
263 
                              ._M_iterator(*this, "this"));
264 
        _Safe_iterator __tmp(*this);
265 
        ++_M_current;
266 
        return __tmp;
267 
      }
268 
 
269 
      // ------ Bidirectional iterator requirements ------
270 
      /**
271 
       *  @brief Iterator predecrement
272 
       *  @pre iterator is decrementable
273 
       */
274 
      _Safe_iterator&
275 
      operator--()
276 
      {
277 
        _GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(),
278 
                              _M_message(__msg_bad_dec)
279 
                              ._M_iterator(*this, "this"));
280 
        --_M_current;
281 
        return *this;
282 
      }
283 
 
284 
      /**
285 
       *  @brief Iterator postdecrement
286 
       *  @pre iterator is decrementable
287 
       */
288 
      _Safe_iterator
289 
      operator--(int)
290 
      {
291 
        _GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(),
292 
                              _M_message(__msg_bad_dec)
293 
                              ._M_iterator(*this, "this"));
294 
        _Safe_iterator __tmp(*this);
295 
        --_M_current;
296 
        return __tmp;
297 
      }
298 
 
299 
      // ------ Random access iterator requirements ------
300 
      reference
301 
      operator[](const difference_type& __n) const
302 
      {
303 
        _GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(__n)
304 
                              && this->_M_can_advance(__n+1),
305 
                              _M_message(__msg_iter_subscript_oob)
306 
                              ._M_iterator(*this)._M_integer(__n));
307 
 
308 
        return _M_current[__n];
309 
      }
310 
 
311 
      _Safe_iterator&
312 
      operator+=(const difference_type& __n)
313 
      {
314 
        _GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(__n),
315 
                              _M_message(__msg_advance_oob)
316 
                              ._M_iterator(*this)._M_integer(__n));
317 
        _M_current += __n;
318 
        return *this;
319 
      }
320 
 
321 
      _Safe_iterator
322 
      operator+(const difference_type& __n) const
323 
      {
324 
        _Safe_iterator __tmp(*this);
325 
        __tmp += __n;
326 
        return __tmp;
327 
      }
328 
 
329 
      _Safe_iterator&
330 
      operator-=(const difference_type& __n)
331 
      {
332 
        _GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(-__n),
333 
                              _M_message(__msg_retreat_oob)
334 
                              ._M_iterator(*this)._M_integer(__n));
335 
        _M_current += -__n;
336 
        return *this;
337 
      }
338 
 
339 
      _Safe_iterator
340 
      operator-(const difference_type& __n) const
341 
      {
342 
        _Safe_iterator __tmp(*this);
343 
        __tmp -= __n;
344 
        return __tmp;
345 
      }
346 
 
347 
      // ------ Utilities ------
348 
      /**
349 
       * @brief Return the underlying iterator
350 
       */
351 
      _Iterator
352 
      base() const { return _M_current; }
353 
 
354 
      /**
355 
       * @brief Conversion to underlying non-debug iterator to allow
356 
       * better interaction with non-debug containers.
357 
       */
358 
      operator _Iterator() const { return _M_current; }
359 
 
360 
      /** Attach iterator to the given sequence. */
361 
      void
362 
      _M_attach(_Safe_sequence_base* __seq)
363 
      {
364 
        _Safe_iterator_base::_M_attach(__seq, _M_constant());
365 
      }
366 
 
367 
      /** Likewise, but not thread-safe. */
368 
      void
369 
      _M_attach_single(_Safe_sequence_base* __seq)
370 
      {
371 
        _Safe_iterator_base::_M_attach_single(__seq, _M_constant());
372 
      }
373 
 
374 
      /// Is the iterator dereferenceable?
375 
      bool
376 
      _M_dereferenceable() const
377 
      { return !this->_M_singular() && !_M_is_end() && !_M_is_before_begin(); }
378 
 
379 
      /// Is the iterator before a dereferenceable one?
380 
      bool
381 
      _M_before_dereferenceable() const
382 
      {
383 
        if (this->_M_incrementable())
384 
        {
385 
          _Iterator __base = base();
386 
          return ++__base != _M_get_sequence()->_M_base().end();
387 
        }
388 
        return false;
389 
      }
390 
 
391 
      /// Is the iterator incrementable?
392 
      bool
393 
      _M_incrementable() const
394 
      { return !this->_M_singular() && !_M_is_end(); }
395 
 
396 
      // Is the iterator decrementable?
397 
      bool
398 
      _M_decrementable() const { return !_M_singular() && !_M_is_begin(); }
399 
 
400 
      // Can we advance the iterator @p __n steps (@p __n may be negative)
401 
      bool
402 
      _M_can_advance(const difference_type& __n) const;
403 
 
404 
      // Is the iterator range [*this, __rhs) valid?
405 
      template<typename _Other>
406 
        bool
407 
        _M_valid_range(const _Safe_iterator<_Other, _Sequence>& __rhs) const;
408 
 
409 
      // The sequence this iterator references.
410 
      const _Sequence*
411 
      _M_get_sequence() const
412 
      { return static_cast<const _Sequence*>(_M_sequence); }
413 
 
414 
      /// Is this iterator equal to the sequence's begin() iterator?
415 
      bool _M_is_begin() const
416 
      { return base() == _M_get_sequence()->_M_base().begin(); }
417 
 
418 
      /// Is this iterator equal to the sequence's end() iterator?
419 
      bool _M_is_end() const
420 
      { return base() == _M_get_sequence()->_M_base().end(); }
421 
 
422 
      /// Is this iterator equal to the sequence's before_begin() iterator if
423 
      /// any?
424 
      bool _M_is_before_begin() const
425 
      { return _BeforeBeginHelper<_Sequence>::_M_Is(base(), _M_get_sequence()); }
426 
    };
427 
 
428 
  template<typename _IteratorL, typename _IteratorR, typename _Sequence>
429 
    inline bool
430 
    operator==(const _Safe_iterator<_IteratorL, _Sequence>& __lhs,
431 
               const _Safe_iterator<_IteratorR, _Sequence>& __rhs)
432 
    {
433 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
434 
                            _M_message(__msg_iter_compare_bad)
435 
                            ._M_iterator(__lhs, "lhs")
436 
                            ._M_iterator(__rhs, "rhs"));
437 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
438 
                            _M_message(__msg_compare_different)
439 
                            ._M_iterator(__lhs, "lhs")
440 
                            ._M_iterator(__rhs, "rhs"));
441 
      return __lhs.base() == __rhs.base();
442 
    }
443 
 
444 
  template<typename _Iterator, typename _Sequence>
445 
    inline bool
446 
    operator==(const _Safe_iterator<_Iterator, _Sequence>& __lhs,
447 
               const _Safe_iterator<_Iterator, _Sequence>& __rhs)
448 
    {
449 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
450 
                            _M_message(__msg_iter_compare_bad)
451 
                            ._M_iterator(__lhs, "lhs")
452 
                            ._M_iterator(__rhs, "rhs"));
453 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
454 
                            _M_message(__msg_compare_different)
455 
                            ._M_iterator(__lhs, "lhs")
456 
                            ._M_iterator(__rhs, "rhs"));
457 
      return __lhs.base() == __rhs.base();
458 
    }
459 
 
460 
  template<typename _IteratorL, typename _IteratorR, typename _Sequence>
461 
    inline bool
462 
    operator!=(const _Safe_iterator<_IteratorL, _Sequence>& __lhs,
463 
               const _Safe_iterator<_IteratorR, _Sequence>& __rhs)
464 
    {
465 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
466 
                            _M_message(__msg_iter_compare_bad)
467 
                            ._M_iterator(__lhs, "lhs")
468 
                            ._M_iterator(__rhs, "rhs"));
469 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
470 
                            _M_message(__msg_compare_different)
471 
                            ._M_iterator(__lhs, "lhs")
472 
                            ._M_iterator(__rhs, "rhs"));
473 
      return __lhs.base() != __rhs.base();
474 
    }
475 
 
476 
  template<typename _Iterator, typename _Sequence>
477 
    inline bool
478 
    operator!=(const _Safe_iterator<_Iterator, _Sequence>& __lhs,
479 
               const _Safe_iterator<_Iterator, _Sequence>& __rhs)
480 
    {
481 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
482 
                            _M_message(__msg_iter_compare_bad)
483 
                            ._M_iterator(__lhs, "lhs")
484 
                            ._M_iterator(__rhs, "rhs"));
485 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
486 
                            _M_message(__msg_compare_different)
487 
                            ._M_iterator(__lhs, "lhs")
488 
                            ._M_iterator(__rhs, "rhs"));
489 
      return __lhs.base() != __rhs.base();
490 
    }
491 
 
492 
  template<typename _IteratorL, typename _IteratorR, typename _Sequence>
493 
    inline bool
494 
    operator<(const _Safe_iterator<_IteratorL, _Sequence>& __lhs,
495 
              const _Safe_iterator<_IteratorR, _Sequence>& __rhs)
496 
    {
497 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
498 
                            _M_message(__msg_iter_order_bad)
499 
                            ._M_iterator(__lhs, "lhs")
500 
                            ._M_iterator(__rhs, "rhs"));
501 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
502 
                            _M_message(__msg_order_different)
503 
                            ._M_iterator(__lhs, "lhs")
504 
                            ._M_iterator(__rhs, "rhs"));
505 
      return __lhs.base() < __rhs.base();
506 
    }
507 
 
508 
  template<typename _Iterator, typename _Sequence>
509 
    inline bool
510 
    operator<(const _Safe_iterator<_Iterator, _Sequence>& __lhs,
511 
              const _Safe_iterator<_Iterator, _Sequence>& __rhs)
512 
    {
513 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
514 
                            _M_message(__msg_iter_order_bad)
515 
                            ._M_iterator(__lhs, "lhs")
516 
                            ._M_iterator(__rhs, "rhs"));
517 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
518 
                            _M_message(__msg_order_different)
519 
                            ._M_iterator(__lhs, "lhs")
520 
                            ._M_iterator(__rhs, "rhs"));
521 
      return __lhs.base() < __rhs.base();
522 
    }
523 
 
524 
  template<typename _IteratorL, typename _IteratorR, typename _Sequence>
525 
    inline bool
526 
    operator<=(const _Safe_iterator<_IteratorL, _Sequence>& __lhs,
527 
               const _Safe_iterator<_IteratorR, _Sequence>& __rhs)
528 
    {
529 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
530 
                            _M_message(__msg_iter_order_bad)
531 
                            ._M_iterator(__lhs, "lhs")
532 
                            ._M_iterator(__rhs, "rhs"));
533 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
534 
                            _M_message(__msg_order_different)
535 
                            ._M_iterator(__lhs, "lhs")
536 
                            ._M_iterator(__rhs, "rhs"));
537 
      return __lhs.base() <= __rhs.base();
538 
    }
539 
 
540 
  template<typename _Iterator, typename _Sequence>
541 
    inline bool
542 
    operator<=(const _Safe_iterator<_Iterator, _Sequence>& __lhs,
543 
               const _Safe_iterator<_Iterator, _Sequence>& __rhs)
544 
    {
545 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
546 
                            _M_message(__msg_iter_order_bad)
547 
                            ._M_iterator(__lhs, "lhs")
548 
                            ._M_iterator(__rhs, "rhs"));
549 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
550 
                            _M_message(__msg_order_different)
551 
                            ._M_iterator(__lhs, "lhs")
552 
                            ._M_iterator(__rhs, "rhs"));
553 
      return __lhs.base() <= __rhs.base();
554 
    }
555 
 
556 
  template<typename _IteratorL, typename _IteratorR, typename _Sequence>
557 
    inline bool
558 
    operator>(const _Safe_iterator<_IteratorL, _Sequence>& __lhs,
559 
              const _Safe_iterator<_IteratorR, _Sequence>& __rhs)
560 
    {
561 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
562 
                            _M_message(__msg_iter_order_bad)
563 
                            ._M_iterator(__lhs, "lhs")
564 
                            ._M_iterator(__rhs, "rhs"));
565 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
566 
                            _M_message(__msg_order_different)
567 
                            ._M_iterator(__lhs, "lhs")
568 
                            ._M_iterator(__rhs, "rhs"));
569 
      return __lhs.base() > __rhs.base();
570 
    }
571 
 
572 
  template<typename _Iterator, typename _Sequence>
573 
    inline bool
574 
    operator>(const _Safe_iterator<_Iterator, _Sequence>& __lhs,
575 
              const _Safe_iterator<_Iterator, _Sequence>& __rhs)
576 
    {
577 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
578 
                            _M_message(__msg_iter_order_bad)
579 
                            ._M_iterator(__lhs, "lhs")
580 
                            ._M_iterator(__rhs, "rhs"));
581 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
582 
                            _M_message(__msg_order_different)
583 
                            ._M_iterator(__lhs, "lhs")
584 
                            ._M_iterator(__rhs, "rhs"));
585 
      return __lhs.base() > __rhs.base();
586 
    }
587 
 
588 
  template<typename _IteratorL, typename _IteratorR, typename _Sequence>
589 
    inline bool
590 
    operator>=(const _Safe_iterator<_IteratorL, _Sequence>& __lhs,
591 
               const _Safe_iterator<_IteratorR, _Sequence>& __rhs)
592 
    {
593 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
594 
                            _M_message(__msg_iter_order_bad)
595 
                            ._M_iterator(__lhs, "lhs")
596 
                            ._M_iterator(__rhs, "rhs"));
597 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
598 
                            _M_message(__msg_order_different)
599 
                            ._M_iterator(__lhs, "lhs")
600 
                            ._M_iterator(__rhs, "rhs"));
601 
      return __lhs.base() >= __rhs.base();
602 
    }
603 
 
604 
  template<typename _Iterator, typename _Sequence>
605 
    inline bool
606 
    operator>=(const _Safe_iterator<_Iterator, _Sequence>& __lhs,
607 
               const _Safe_iterator<_Iterator, _Sequence>& __rhs)
608 
    {
609 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
610 
                            _M_message(__msg_iter_order_bad)
611 
                            ._M_iterator(__lhs, "lhs")
612 
                            ._M_iterator(__rhs, "rhs"));
613 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
614 
                            _M_message(__msg_order_different)
615 
                            ._M_iterator(__lhs, "lhs")
616 
                            ._M_iterator(__rhs, "rhs"));
617 
      return __lhs.base() >= __rhs.base();
618 
    }
619 
 
620 
  // _GLIBCXX_RESOLVE_LIB_DEFECTS
621 
  // According to the resolution of DR179 not only the various comparison
622 
  // operators but also operator- must accept mixed iterator/const_iterator
623 
  // parameters.
624 
  template<typename _IteratorL, typename _IteratorR, typename _Sequence>
625 
    inline typename _Safe_iterator<_IteratorL, _Sequence>::difference_type
626 
    operator-(const _Safe_iterator<_IteratorL, _Sequence>& __lhs,
627 
              const _Safe_iterator<_IteratorR, _Sequence>& __rhs)
628 
    {
629 
      _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
630 
                            _M_message(__msg_distance_bad)
631 
                            ._M_iterator(__lhs, "lhs")
632 
                            ._M_iterator(__rhs, "rhs"));
633 
      _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
634 
                            _M_message(__msg_distance_different)
635 
                            ._M_iterator(__lhs, "lhs")
636 
                            ._M_iterator(__rhs, "rhs"));
637 
      return __lhs.base() - __rhs.base();
638 
    }
639 
 
640 
   template<typename _Iterator, typename _Sequence>
641 
     inline typename _Safe_iterator<_Iterator, _Sequence>::difference_type
642 
     operator-(const _Safe_iterator<_Iterator, _Sequence>& __lhs,
643 
               const _Safe_iterator<_Iterator, _Sequence>& __rhs)
644 
     {
645 
       _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
646 
                             _M_message(__msg_distance_bad)
647 
                             ._M_iterator(__lhs, "lhs")
648 
                             ._M_iterator(__rhs, "rhs"));
649 
       _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
650 
                             _M_message(__msg_distance_different)
651 
                             ._M_iterator(__lhs, "lhs")
652 
                             ._M_iterator(__rhs, "rhs"));
653 
       return __lhs.base() - __rhs.base();
654 
     }
655 
 
656 
  template<typename _Iterator, typename _Sequence>
657 
    inline _Safe_iterator<_Iterator, _Sequence>
658 
    operator+(typename _Safe_iterator<_Iterator,_Sequence>::difference_type __n,
659 
              const _Safe_iterator<_Iterator, _Sequence>& __i)
660 
    { return __i + __n; }
661 
 
662 
  // Helper struct to detect random access safe iterators.
663 
  template<typename _Iterator>
664 
    struct __is_safe_random_iterator
665 
    {
666 
      enum { __value = 0 };
667 
      typedef std::__false_type __type;
668 
    };
669 
 
670 
  template<typename _Iterator, typename _Sequence>
671 
    struct __is_safe_random_iterator<_Safe_iterator<_Iterator, _Sequence> >
672 
    : std::__are_same<std::random_access_iterator_tag,
673 
                      typename std::iterator_traits<_Iterator>::
674 
                      iterator_category>
675 
    { };
676 
 
677 
  template<typename _Iterator>
678 
    struct _Siter_base
679 
    : std::_Iter_base<_Iterator, __is_safe_random_iterator<_Iterator>::__value>
680 
    { };
681 
 
682 
  /** Helper function to extract base iterator of random access safe iterator
683 
      in order to reduce performance impact of debug mode.  Limited to random
684 
      access iterator because it is the only category for which it is possible
685 
      to check for correct iterators order in the __valid_range function
686 
      thanks to the < operator.
687 
  */
688 
  template<typename _Iterator>
689 
    inline typename _Siter_base<_Iterator>::iterator_type
690 
    __base(_Iterator __it)
691 
    { return _Siter_base<_Iterator>::_S_base(__it); }
692 
} // namespace __gnu_debug
693 
 
694 
#include <debug/safe_iterator.tcc>
695 
 
696 
#endif

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