libstdc++
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00001 // Debugging iterator implementation (out of line) -*- C++ -*- 00002 00003 // Copyright (C) 2011-2015 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 bool 00036 _Safe_local_iterator<_Iterator, _Sequence>:: 00037 _M_valid_range(const _Safe_local_iterator& __rhs) const 00038 { 00039 if (!_M_can_compare(__rhs)) 00040 return false; 00041 if (bucket() != __rhs.bucket()) 00042 return false; 00043 00044 /* Determine if we can order the iterators without the help of 00045 the container */ 00046 std::pair<difference_type, _Distance_precision> __dist = 00047 __get_distance(base(), __rhs.base()); 00048 switch (__dist.second) 00049 { 00050 case __dp_equality: 00051 if (__dist.first == 0) 00052 return true; 00053 break; 00054 00055 case __dp_sign: 00056 case __dp_exact: 00057 return __dist.first >= 0; 00058 } 00059 00060 /* We can only test for equality, but check if one of the 00061 iterators is at an extreme. */ 00062 /* Optim for classic [begin, it) or [it, end) ranges, limit checks 00063 * when code is valid. */ 00064 if (_M_is_begin() || __rhs._M_is_end()) 00065 return true; 00066 if (_M_is_end() || __rhs._M_is_begin()) 00067 return false; 00068 00069 // Assume that this is a valid range; we can't check anything else 00070 return true; 00071 } 00072 } // namespace __gnu_debug 00073 00074 #endif