--- /dev/null
+// Debugging iterator implementation (out of line) -*- C++ -*-
+
+// Copyright (C) 2011 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file debug/safe_local_iterator.tcc
+ * This file is a GNU debug extension to the Standard C++ Library.
+ */
+
+#ifndef _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_TCC
+#define _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_TCC 1
+
+namespace __gnu_debug
+{
+ template<typename _Iterator, typename _Sequence>
+ template<typename _Other>
+ bool
+ _Safe_local_iterator<_Iterator, _Sequence>::
+ _M_valid_range(const _Safe_local_iterator<_Other, _Sequence>& __rhs) const
+ {
+ if (!_M_can_compare(__rhs))
+ return false;
+ if (_M_bucket != __rhs._M_bucket)
+ return false;
+
+ /* Determine if we can order the iterators without the help of
+ the container */
+ std::pair<difference_type, _Distance_precision> __dist =
+ __get_distance(base(), __rhs.base());
+ switch (__dist.second)
+ {
+ case __dp_equality:
+ if (__dist.first == 0)
+ return true;
+ break;
+
+ case __dp_sign:
+ case __dp_exact:
+ return __dist.first >= 0;
+ }
+
+ /* We can only test for equality, but check if one of the
+ iterators is at an extreme. */
+ /* Optim for classic [begin, it) or [it, end) ranges, limit checks
+ * when code is valid. */
+ if (_M_is_begin() || __rhs._M_is_end())
+ return true;
+ if (_M_is_end() || __rhs._M_is_begin())
+ return false;
+
+ // Assume that this is a valid range; we can't check anything else
+ return true;
+ }
+} // namespace __gnu_debug
+
+#endif