libstdc++
safe_local_iterator.tcc
Go to the documentation of this file.
00001 // Debugging iterator implementation (out of line) -*- C++ -*-
00002 
00003 // Copyright (C) 2011 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 3, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /** @file debug/safe_local_iterator.tcc
00026  *  This file is a GNU debug extension to the Standard C++ Library.
00027  */
00028 
00029 #ifndef _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_TCC
00030 #define _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_TCC 1
00031 
00032 namespace __gnu_debug
00033 {
00034   template<typename _Iterator, typename _Sequence>
00035     template<typename _Other>
00036       bool
00037       _Safe_local_iterator<_Iterator, _Sequence>::
00038       _M_valid_range(const _Safe_local_iterator<_Other, _Sequence>& __rhs) const
00039       {
00040     if (!_M_can_compare(__rhs))
00041       return false;
00042     if (_M_bucket != __rhs._M_bucket)
00043       return false;
00044 
00045     /* Determine if we can order the iterators without the help of
00046        the container */
00047     std::pair<difference_type, _Distance_precision> __dist =
00048       __get_distance(base(), __rhs.base());
00049     switch (__dist.second)
00050     {
00051     case __dp_equality:
00052       if (__dist.first == 0)
00053         return true;
00054       break;
00055 
00056     case __dp_sign:
00057     case __dp_exact:
00058       return __dist.first >= 0;
00059     }
00060 
00061     /* We can only test for equality, but check if one of the
00062        iterators is at an extreme. */
00063     /* Optim for classic [begin, it) or [it, end) ranges, limit checks
00064      * when code is valid. */
00065     if (_M_is_begin() || __rhs._M_is_end())
00066       return true;
00067     if (_M_is_end() || __rhs._M_is_begin())
00068       return false;
00069 
00070     // Assume that this is a valid range; we can't check anything else
00071     return true;
00072       }
00073 } // namespace __gnu_debug
00074 
00075 #endif