libstdc++-v3/src/compatibility-list.cc

   1 // Compatibility symbols for previous versions, list bits -*- C++ -*-
   2
   3 // Copyright (C) 2010 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 #include <bits/move.h>
  26
  27 _GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_D)
  28
  29   struct _List_node_base
  30   {
  31     _List_node_base* _M_next;
  32     _List_node_base* _M_prev;
  33
  34     void
  35     transfer(_List_node_base * const __first,
  36              _List_node_base * const __last) throw ();
  37
  38     void
  39     reverse() throw ();
  40
  41     void
  42     hook(_List_node_base * const __position) throw ();
  43
  44     void
  45     unhook() throw ();
  46   };
  47
  48   void
  49   _List_node_base::transfer(_List_node_base * const __first,
  50                             _List_node_base * const __last) throw ()
  51   {
  52     if (this != __last)
  53     {
  54       // Remove [first, last) from its old position.
  55       __last->_M_prev->_M_next  = this;
  56       __first->_M_prev->_M_next = __last;
  57       this->_M_prev->_M_next    = __first;
  58
  59       // Splice [first, last) into its new position.
  60       _List_node_base* const __tmp = this->_M_prev;
  61       this->_M_prev                = __last->_M_prev;
  62       __last->_M_prev              = __first->_M_prev;
  63       __first->_M_prev             = __tmp;
  64     }
  65   }
  66
  67   void
  68   _List_node_base::reverse() throw ()
  69   {
  70     _List_node_base* __tmp = this;
  71     do
  72     {
  73       std::swap(__tmp->_M_next, __tmp->_M_prev);
  74
  75       // Old next node is now prev.
  76       __tmp = __tmp->_M_prev;
  77     }
  78     while (__tmp != this);
  79   }
  80
  81   void
  82   _List_node_base::hook(_List_node_base* const __position) throw ()
  83   {
  84     this->_M_next = __position;
  85     this->_M_prev = __position->_M_prev;
  86     __position->_M_prev->_M_next = this;
  87     __position->_M_prev = this;
  88   }
  89
  90   void
  91   _List_node_base::unhook() throw ()
  92   {
  93     _List_node_base* const __next_node = this->_M_next;
  94     _List_node_base* const __prev_node = this->_M_prev;
  95     __prev_node->_M_next = __next_node;
  96     __next_node->_M_prev = __prev_node;
  97   }
  98
  99 _GLIBCXX_END_NESTED_NAMESPACE