1// Debugging iterator implementation (out of line) -*- C++ -*-
2
3// Copyright (C) 2011-2015 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
32namespace __gnu_debug
33{
34  template<typename _Iterator, typename _Sequence>
35    bool
36    _Safe_local_iterator<_Iterator, _Sequence>::
37    _M_valid_range(const _Safe_local_iterator& __rhs) const
38    {
39      if (!_M_can_compare(__rhs))
40	return false;
41      if (bucket() != __rhs.bucket())
42	return false;
43
44      /* Determine if we can order the iterators without the help of
45	 the container */
46      std::pair<difference_type, _Distance_precision> __dist =
47	__get_distance(base(), __rhs.base());
48      switch (__dist.second)
49	{
50	case __dp_equality:
51	  if (__dist.first == 0)
52	    return true;
53	  break;
54
55	case __dp_sign:
56	case __dp_exact:
57	  return __dist.first >= 0;
58	}
59
60      /* We can only test for equality, but check if one of the
61	 iterators is at an extreme. */
62      /* Optim for classic [begin, it) or [it, end) ranges, limit checks
63       * when code is valid. */
64      if (_M_is_begin() || __rhs._M_is_end())
65	return true;
66      if (_M_is_end() || __rhs._M_is_begin())
67	return false;
68
69      // Assume that this is a valid range; we can't check anything else
70      return true;
71    }
72} // namespace __gnu_debug
73
74#endif
75