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