libstdc++-v3/include/ext/pb_ds/detail/left_child_next_sibling_heap_/insert_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2022 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 3, 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 // 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 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  26
  27 // Permission to use, copy, modify, sell, and distribute this software
  28 // is hereby granted without fee, provided that the above copyright
  29 // notice appears in all copies, and that both that copyright notice
  30 // and this permission notice appear in supporting documentation. None
  31 // of the above authors, nor IBM Haifa Research Laboratories, make any
  32 // representation about the suitability of this software for any
  33 // purpose. It is provided "as is" without express or implied
  34 // warranty.
  35
  36 /**
  37  * @file left_child_next_sibling_heap_/insert_fn_imps.hpp
  38  * Contains an implementation class for left_child_next_sibling_heap_.
  39  */
  40
  41 #ifdef PB_DS_CLASS_C_DEC
  42
  43 PB_DS_CLASS_T_DEC
  44 inline typename PB_DS_CLASS_C_DEC::node_pointer
  45 PB_DS_CLASS_C_DEC::
  46 get_new_node_for_insert(const_reference r_val)
  47 {
  48   return get_new_node_for_insert(r_val, s_no_throw_copies_ind);
  49 }
  50
  51 PB_DS_CLASS_T_DEC
  52 inline typename PB_DS_CLASS_C_DEC::node_pointer
  53 PB_DS_CLASS_C_DEC::
  54 get_new_node_for_insert(const_reference r_val, false_type)
  55 {
  56   node_pointer p_new_nd = s_node_allocator.allocate(1);
  57
  58   cond_dealtor_t cond(p_new_nd);
  59
  60   new (const_cast<void* >(
  61                           static_cast<const void* >(&p_new_nd->m_value)))
  62     typename node::value_type(r_val);
  63
  64   cond.set_no_action();
  65
  66   ++m_size;
  67
  68   return (p_new_nd);
  69 }
  70
  71 PB_DS_CLASS_T_DEC
  72 inline typename PB_DS_CLASS_C_DEC::node_pointer
  73 PB_DS_CLASS_C_DEC::
  74 get_new_node_for_insert(const_reference r_val, true_type)
  75 {
  76   node_pointer p_new_nd = s_node_allocator.allocate(1);
  77
  78   new (const_cast<void* >(
  79                           static_cast<const void* >(&p_new_nd->m_value)))
  80     typename node::value_type(r_val);
  81
  82   ++m_size;
  83
  84   return (p_new_nd);
  85 }
  86
  87 PB_DS_CLASS_T_DEC
  88 inline void
  89 PB_DS_CLASS_C_DEC::
  90 make_child_of(node_pointer p_nd, node_pointer p_new_parent)
  91 {
  92   _GLIBCXX_DEBUG_ASSERT(p_nd != 0);
  93   _GLIBCXX_DEBUG_ASSERT(p_new_parent != 0);
  94
  95   p_nd->m_p_next_sibling = p_new_parent->m_p_l_child;
  96
  97   if (p_new_parent->m_p_l_child != 0)
  98     p_new_parent->m_p_l_child->m_p_prev_or_parent = p_nd;
  99
 100   p_nd->m_p_prev_or_parent = p_new_parent;
 101
 102   p_new_parent->m_p_l_child = p_nd;
 103 }
 104
 105 PB_DS_CLASS_T_DEC
 106 inline typename PB_DS_CLASS_C_DEC::node_pointer
 107 PB_DS_CLASS_C_DEC::
 108 parent(node_pointer p_nd)
 109 {
 110   while (true)
 111     {
 112       node_pointer p_pot = p_nd->m_p_prev_or_parent;
 113
 114       if (p_pot == 0 || p_pot->m_p_l_child == p_nd)
 115         return p_pot;
 116
 117       p_nd = p_pot;
 118     }
 119 }
 120
 121 PB_DS_CLASS_T_DEC
 122 inline void
 123 PB_DS_CLASS_C_DEC::
 124 swap_with_parent(node_pointer p_nd, node_pointer p_parent)
 125 {
 126   if (p_parent == m_p_root)
 127     m_p_root = p_nd;
 128
 129   _GLIBCXX_DEBUG_ASSERT(p_nd != 0);
 130   _GLIBCXX_DEBUG_ASSERT(p_parent != 0);
 131   _GLIBCXX_DEBUG_ASSERT(parent(p_nd) == p_parent);
 132
 133   const bool nd_direct_child = p_parent->m_p_l_child == p_nd;
 134   const bool parent_root = p_parent->m_p_prev_or_parent == 0;
 135   const bool parent_direct_child =
 136     !parent_root&&  p_parent->m_p_prev_or_parent->m_p_l_child == p_parent;
 137
 138   std::swap(p_parent->m_p_prev_or_parent, p_nd->m_p_prev_or_parent);
 139   std::swap(p_parent->m_p_next_sibling, p_nd->m_p_next_sibling);
 140   std::swap(p_parent->m_p_l_child, p_nd->m_p_l_child);
 141   std::swap(p_parent->m_metadata, p_nd->m_metadata);
 142
 143   _GLIBCXX_DEBUG_ASSERT(p_nd->m_p_l_child != 0);
 144   _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_prev_or_parent != 0);
 145
 146   if (p_nd->m_p_next_sibling != 0)
 147     p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd;
 148
 149   if (p_parent->m_p_next_sibling != 0)
 150     p_parent->m_p_next_sibling->m_p_prev_or_parent = p_parent;
 151
 152   if (p_parent->m_p_l_child != 0)
 153     p_parent->m_p_l_child->m_p_prev_or_parent = p_parent;
 154
 155   if (parent_direct_child)
 156     p_nd->m_p_prev_or_parent->m_p_l_child = p_nd;
 157   else if (!parent_root)
 158     p_nd->m_p_prev_or_parent->m_p_next_sibling = p_nd;
 159
 160   if (!nd_direct_child)
 161     {
 162       p_nd->m_p_l_child->m_p_prev_or_parent = p_nd;
 163
 164       p_parent->m_p_prev_or_parent->m_p_next_sibling = p_parent;
 165     }
 166   else
 167     {
 168       _GLIBCXX_DEBUG_ASSERT(p_nd->m_p_l_child == p_nd);
 169       _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_prev_or_parent == p_parent);
 170
 171       p_nd->m_p_l_child = p_parent;
 172       p_parent->m_p_prev_or_parent = p_nd;
 173     }
 174
 175   _GLIBCXX_DEBUG_ASSERT(parent(p_parent) == p_nd);
 176 }
 177
 178 #endif