libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/rotate_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006 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 terms
   7 // of the GNU General Public License as published by the Free Software
   8 // Foundation; either version 2, or (at your option) any later
   9 // version.
  10
  11 // This library is distributed in the hope that it will be useful, but
  12 // WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 // General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License
  17 // along with this library; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  19 // MA 02111-1307, USA.
  20
  21 // As a special exception, you may use this file as part of a free
  22 // software library without restriction.  Specifically, if other files
  23 // instantiate templates or use macros or inline functions from this
  24 // file, or you compile this file and link it with other files to
  25 // produce an executable, this file does not by itself cause the
  26 // resulting executable to be covered by the GNU General Public
  27 // License.  This exception does not however invalidate any other
  28 // reasons why the executable file might be covered by the GNU General
  29 // Public License.
  30
  31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  32
  33 // Permission to use, copy, modify, sell, and distribute this software
  34 // is hereby granted without fee, provided that the above copyright
  35 // notice appears in all copies, and that both that copyright notice
  36 // and this permission notice appear in supporting documentation. None
  37 // of the above authors, nor IBM Haifa Research Laboratories, make any
  38 // representation about the suitability of this software for any
  39 // purpose. It is provided "as is" without express or implied
  40 // warranty.
  41
  42 /**
  43  * @file rotate_fn_imps.hpp
  44  * Contains imps for rotating nodes.
  45  */
  46
  47 PB_DS_CLASS_T_DEC
  48 inline void
  49 PB_DS_CLASS_C_DEC::
  50 rotate_left(node_pointer p_x)
  51 {
  52   node_pointer p_y = p_x->m_p_right;
  53   p_x->m_p_right = p_y->m_p_left;
  54
  55   if (p_y->m_p_left != NULL)
  56     p_y->m_p_left->m_p_parent = p_x;
  57
  58   p_y->m_p_parent = p_x->m_p_parent;
  59   if (p_x == m_p_head->m_p_parent)
  60     m_p_head->m_p_parent = p_y;
  61   else if (p_x == p_x->m_p_parent->m_p_left)
  62     p_x->m_p_parent->m_p_left = p_y;
  63   else
  64     p_x->m_p_parent->m_p_right = p_y;
  65
  66   p_y->m_p_left = p_x;
  67   p_x->m_p_parent = p_y;
  68
  69   _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_x);)
  70   _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_y);)
  71
  72   apply_update(p_x, (Node_Update* )this);
  73   apply_update(p_x->m_p_parent, (Node_Update* )this);
  74 }
  75
  76 PB_DS_CLASS_T_DEC
  77 inline void
  78 PB_DS_CLASS_C_DEC::
  79 rotate_right(node_pointer p_x)
  80 {
  81   node_pointer p_y = p_x->m_p_left;
  82   p_x->m_p_left = p_y->m_p_right;
  83
  84   if (p_y->m_p_right != NULL)
  85     p_y->m_p_right->m_p_parent = p_x;
  86
  87   p_y->m_p_parent = p_x->m_p_parent;
  88   if (p_x == m_p_head->m_p_parent)
  89     m_p_head->m_p_parent = p_y;
  90   else if (p_x == p_x->m_p_parent->m_p_right)
  91     p_x->m_p_parent->m_p_right = p_y;
  92   else
  93     p_x->m_p_parent->m_p_left = p_y;
  94
  95   p_y->m_p_right = p_x;
  96   p_x->m_p_parent = p_y;
  97
  98   _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_x);)
  99   _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_y);)
 100
 101   apply_update(p_x, (Node_Update* )this);
 102   apply_update(p_x->m_p_parent, (Node_Update* )this);
 103 }
 104
 105 PB_DS_CLASS_T_DEC
 106 inline void
 107 PB_DS_CLASS_C_DEC::
 108 rotate_parent(node_pointer p_nd)
 109 {
 110   node_pointer p_parent = p_nd->m_p_parent;
 111   if (p_nd == p_parent->m_p_left)
 112     rotate_right(p_parent);
 113   else
 114     rotate_left(p_parent);
 115   _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_parent = p_nd);
 116   _GLIBCXX_DEBUG_ASSERT(p_nd->m_p_left == p_parent || p_nd->m_p_right == p_parent);
 117 }
 118
 119 PB_DS_CLASS_T_DEC
 120 inline void
 121 PB_DS_CLASS_C_DEC::
 122 apply_update(node_pointer /*p_nd*/, __gnu_pbds::null_node_update*  /*p_update*/)
 123 { }
 124
 125 PB_DS_CLASS_T_DEC
 126 template<typename Node_Update_>
 127 inline void
 128 PB_DS_CLASS_C_DEC::
 129 apply_update(node_pointer p_nd, Node_Update_* p_update)
 130 {
 131   p_update->operator()(& PB_DS_V2F(p_nd->m_value),(p_nd->m_p_left == NULL) ?
 132                         NULL :
 133                         & PB_DS_V2F(p_nd->m_p_left->m_value),(p_nd->m_p_right == NULL) ?
 134                         NULL :
 135                         & PB_DS_V2F(p_nd->m_p_right->m_value));
 136 }
 137
 138 PB_DS_CLASS_T_DEC
 139 template<typename Node_Update_>
 140 inline void
 141 PB_DS_CLASS_C_DEC::
 142 update_to_top(node_pointer p_nd, Node_Update_* p_update)
 143 {
 144   while (p_nd != m_p_head)
 145     {
 146       apply_update(p_nd, p_update);
 147       p_nd = p_nd->m_p_parent;
 148     }
 149 }
 150
 151 PB_DS_CLASS_T_DEC
 152 inline void
 153 PB_DS_CLASS_C_DEC::
 154 update_to_top(node_pointer /*p_nd*/, __gnu_pbds::null_node_update*  /*p_update*/)
 155 { }
 156