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  1. // Safe sequence implementation  -*- C++ -*-
  2.  
  3. // Copyright (C) 2010-2013 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_sequence.tcc
  26.  *  This file is a GNU debug extension to the Standard C++ Library.
  27.  */
  28.  
  29. #ifndef _GLIBCXX_DEBUG_SAFE_SEQUENCE_TCC
  30. #define _GLIBCXX_DEBUG_SAFE_SEQUENCE_TCC 1
  31.  
  32. namespace __gnu_debug
  33. {
  34.   template<typename _Sequence>
  35.     template<typename _Predicate>
  36.       void
  37.       _Safe_sequence<_Sequence>::
  38.       _M_invalidate_if(_Predicate __pred)
  39.       {
  40.         typedef typename _Sequence::iterator iterator;
  41.         typedef typename _Sequence::const_iterator const_iterator;
  42.  
  43.         __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex());
  44.         for (_Safe_iterator_base* __iter = _M_iterators; __iter;)
  45.           {
  46.             iterator* __victim = static_cast<iterator*>(__iter);
  47.             __iter = __iter->_M_next;
  48.             if (!__victim->_M_singular() && __pred(__victim->base()))
  49.               {
  50.                 __victim->_M_invalidate();
  51.               }
  52.           }
  53.  
  54.         for (_Safe_iterator_base* __iter2 = _M_const_iterators; __iter2;)
  55.           {
  56.             const_iterator* __victim = static_cast<const_iterator*>(__iter2);
  57.             __iter2 = __iter2->_M_next;
  58.             if (!__victim->_M_singular() && __pred(__victim->base()))
  59.               {
  60.                 __victim->_M_invalidate();
  61.               }
  62.           }
  63.       }
  64.  
  65.   template<typename _Sequence>
  66.     template<typename _Predicate>
  67.       void
  68.       _Safe_sequence<_Sequence>::
  69.       _M_transfer_from_if(_Safe_sequence& __from, _Predicate __pred)
  70.       {
  71.         typedef typename _Sequence::iterator iterator;
  72.         typedef typename _Sequence::const_iterator const_iterator;
  73.  
  74.         _Safe_iterator_base* __transfered_iterators = 0;
  75.         _Safe_iterator_base* __transfered_const_iterators = 0;
  76.         _Safe_iterator_base* __last_iterator = 0;
  77.         _Safe_iterator_base* __last_const_iterator = 0;
  78.         {
  79.           // We lock __from first and detach iterator(s) to transfer
  80.           __gnu_cxx::__scoped_lock sentry(__from._M_get_mutex());
  81.  
  82.           for (_Safe_iterator_base* __iter = __from._M_iterators; __iter;)
  83.             {
  84.               iterator* __victim = static_cast<iterator*>(__iter);
  85.               __iter = __iter->_M_next;
  86.               if (!__victim->_M_singular() && __pred(__victim->base()))
  87.                 {
  88.                   __victim->_M_detach_single();
  89.                   if (__transfered_iterators)
  90.                     {
  91.                       __victim->_M_next = __transfered_iterators;
  92.                       __transfered_iterators->_M_prior = __victim;
  93.                     }
  94.                   else
  95.                     __last_iterator = __victim;
  96.                   __victim->_M_sequence = this;
  97.                   __victim->_M_version = this->_M_version;
  98.                   __transfered_iterators = __victim;
  99.                 }
  100.             }
  101.  
  102.           for (_Safe_iterator_base* __iter2 = __from._M_const_iterators;
  103.                  __iter2;)
  104.             {
  105.               const_iterator* __victim = static_cast<const_iterator*>(__iter2);
  106.               __iter2 = __iter2->_M_next;
  107.               if (!__victim->_M_singular() && __pred(__victim->base()))
  108.                 {
  109.                   __victim->_M_detach_single();
  110.                   if (__transfered_const_iterators)
  111.                     {
  112.                       __victim->_M_next = __transfered_const_iterators;
  113.                       __transfered_const_iterators->_M_prior = __victim;
  114.                     }
  115.                   else
  116.                     __last_const_iterator = __victim;
  117.                   __victim->_M_sequence = this;
  118.                   __victim->_M_version = this->_M_version;
  119.                   __transfered_const_iterators = __victim;
  120.                 }
  121.             }
  122.         }
  123.  
  124.         // Now we can lock *this and add the transfered iterators if any
  125.         if (__last_iterator || __last_const_iterator)
  126.           {
  127.             __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex());
  128.             if (__last_iterator)
  129.               {
  130.                 if (this->_M_iterators)
  131.                   {
  132.                     this->_M_iterators->_M_prior = __last_iterator;
  133.                     __last_iterator->_M_next = this->_M_iterators;
  134.                   }
  135.                 this->_M_iterators = __transfered_iterators;
  136.               }
  137.             if (__last_const_iterator)
  138.               {
  139.                 if (this->_M_const_iterators)
  140.                   {
  141.                     this->_M_const_iterators->_M_prior = __last_const_iterator;
  142.                     __last_const_iterator->_M_next = this->_M_const_iterators;
  143.                   }
  144.                 this->_M_const_iterators = __transfered_const_iterators;
  145.               }
  146.           }
  147.       }
  148. } // namespace __gnu_debug
  149.  
  150. #endif
  151.