libstdc++
safe_local_iterator.tcc
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1 // Debugging iterator implementation (out of line) -*- C++ -*-
2 
3 // Copyright (C) 2011 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_local_iterator.tcc
26  * This file is a GNU debug extension to the Standard C++ Library.
27  */
28 
29 #ifndef _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_TCC
30 #define _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_TCC 1
31 
32 namespace __gnu_debug
33 {
34  template<typename _Iterator, typename _Sequence>
35  template<typename _Other>
36  bool
37  _Safe_local_iterator<_Iterator, _Sequence>::
38  _M_valid_range(const _Safe_local_iterator<_Other, _Sequence>& __rhs) const
39  {
40  if (!_M_can_compare(__rhs))
41  return false;
42  if (_M_bucket != __rhs._M_bucket)
43  return false;
44 
45  /* Determine if we can order the iterators without the help of
46  the container */
48  __get_distance(base(), __rhs.base());
49  switch (__dist.second)
50  {
51  case __dp_equality:
52  if (__dist.first == 0)
53  return true;
54  break;
55 
56  case __dp_sign:
57  case __dp_exact:
58  return __dist.first >= 0;
59  }
60 
61  /* We can only test for equality, but check if one of the
62  iterators is at an extreme. */
63  /* Optim for classic [begin, it) or [it, end) ranges, limit checks
64  * when code is valid. */
65  if (_M_is_begin() || __rhs._M_is_end())
66  return true;
67  if (_M_is_end() || __rhs._M_is_begin())
68  return false;
69 
70  // Assume that this is a valid range; we can't check anything else
71  return true;
72  }
73 } // namespace __gnu_debug
74 
75 #endif