libstdc++
safe_local_iterator.tcc
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00001 // Debugging iterator implementation (out of line) -*- C++ -*-
00002 
00003 // Copyright (C) 2011-2017 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,
00038                 std::pair<difference_type, _Distance_precision>& __dist) const
00039     {
00040       if (!_M_can_compare(__rhs))
00041         return false;
00042 
00043       if (bucket() != __rhs.bucket())
00044         return false;
00045 
00046       /* Determine if we can order the iterators without the help of
00047          the container */
00048       __dist = __get_distance(*this, __rhs);
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       // Assume that this is a valid range; we can't check anything else
00062       return true;
00063     }
00064 } // namespace __gnu_debug
00065 
00066 #endif