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  1. // Debugging iterator implementation (out of line) -*- C++ -*-
  2.  
  3. // Copyright (C) 2003-2015 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_iterator.tcc
  26.  *  This file is a GNU debug extension to the Standard C++ Library.
  27.  */
  28.  
  29. #ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC
  30. #define _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 1
  31.  
  32. namespace __gnu_debug
  33. {
  34.   template<typename _Iterator, typename _Sequence>
  35.     bool
  36.     _Safe_iterator<_Iterator, _Sequence>::
  37.     _M_can_advance(const difference_type& __n) const
  38.     {
  39.       if (this->_M_singular())
  40.         return false;
  41.       if (__n == 0)
  42.         return true;
  43.       if (__n < 0)
  44.         {
  45.           std::pair<difference_type, _Distance_precision> __dist =
  46.             __get_distance(_M_get_sequence()->_M_base().begin(), base());
  47.           bool __ok =  ((__dist.second == __dp_exact && __dist.first >= -__n)
  48.                         || (__dist.second != __dp_exact && __dist.first > 0));
  49.           return __ok;
  50.         }
  51.       else
  52.         {
  53.           std::pair<difference_type, _Distance_precision> __dist =
  54.             __get_distance(base(), _M_get_sequence()->_M_base().end());
  55.           bool __ok = ((__dist.second == __dp_exact && __dist.first >= __n)
  56.                        || (__dist.second != __dp_exact && __dist.first > 0));
  57.           return __ok;
  58.         }
  59.     }
  60.  
  61.   template<typename _Iterator, typename _Sequence>
  62.     bool
  63.     _Safe_iterator<_Iterator, _Sequence>::
  64.     _M_valid_range(const _Safe_iterator& __rhs) const
  65.     {
  66.       if (!_M_can_compare(__rhs))
  67.         return false;
  68.  
  69.       /* Determine if we can order the iterators without the help of
  70.          the container */
  71.       std::pair<difference_type, _Distance_precision> __dist =
  72.         __get_distance(base(), __rhs.base());
  73.       switch (__dist.second) {
  74.       case __dp_equality:
  75.         if (__dist.first == 0)
  76.           return true;
  77.         break;
  78.  
  79.       case __dp_sign:
  80.       case __dp_exact:
  81.         return __dist.first >= 0;
  82.       }
  83.  
  84.       /* We can only test for equality, but check if one of the
  85.          iterators is at an extreme. */
  86.       /* Optim for classic [begin, it) or [it, end) ranges, limit checks
  87.        * when code is valid.  Note, for the special case of forward_list,
  88.        * before_begin replaces the role of begin.  */
  89.       if (_M_is_beginnest() || __rhs._M_is_end())
  90.         return true;
  91.       if (_M_is_end() || __rhs._M_is_beginnest())
  92.         return false;
  93.  
  94.       // Assume that this is a valid range; we can't check anything else
  95.       return true;
  96.     }
  97. } // namespace __gnu_debug
  98.  
  99. #endif
  100.  
  101.