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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2019 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_/erase_fn_imps.hpp
  38  * Contains an implementation class for left_child_next_sibling_heap_.
  39  */
  40
  41 PB_DS_CLASS_T_DEC
  42 void
  43 PB_DS_CLASS_C_DEC::
  44 clear()
  45 {
  46   clear_imp(m_p_root);
  47   _GLIBCXX_DEBUG_ASSERT(m_size == 0);
  48   m_p_root = 0;
  49 }
  50
  51 PB_DS_CLASS_T_DEC
  52 inline void
  53 PB_DS_CLASS_C_DEC::
  54 actual_erase_node(node_pointer p_nd)
  55 {
  56   _GLIBCXX_DEBUG_ASSERT(m_size > 0);
  57   --m_size;
  58   p_nd->~node();
  59   s_node_allocator.deallocate(p_nd, 1);
  60 }
  61
  62 PB_DS_CLASS_T_DEC
  63 void
  64 PB_DS_CLASS_C_DEC::
  65 clear_imp(node_pointer p_nd)
  66 {
  67   while (p_nd != 0)
  68     {
  69       clear_imp(p_nd->m_p_l_child);
  70       node_pointer p_next = p_nd->m_p_next_sibling;
  71       actual_erase_node(p_nd);
  72       p_nd = p_next;
  73     }
  74 }
  75
  76 PB_DS_CLASS_T_DEC
  77 void
  78 PB_DS_CLASS_C_DEC::
  79 to_linked_list()
  80 {
  81   PB_DS_ASSERT_VALID((*this))
  82   node_pointer p_cur = m_p_root;
  83   while (p_cur != 0)
  84     if (p_cur->m_p_l_child != 0)
  85       {
  86         node_pointer p_child_next = p_cur->m_p_l_child->m_p_next_sibling;
  87         p_cur->m_p_l_child->m_p_next_sibling = p_cur->m_p_next_sibling;
  88         p_cur->m_p_next_sibling = p_cur->m_p_l_child;
  89         p_cur->m_p_l_child = p_child_next;
  90       }
  91     else
  92       p_cur = p_cur->m_p_next_sibling;
  93
  94 #ifdef _GLIBCXX_DEBUG
  95   node_const_pointer p_counter = m_p_root;
  96   size_type count = 0;
  97   while (p_counter != 0)
  98     {
  99       ++count;
 100       _GLIBCXX_DEBUG_ASSERT(p_counter->m_p_l_child == 0);
 101       p_counter = p_counter->m_p_next_sibling;
 102     }
 103   _GLIBCXX_DEBUG_ASSERT(count == m_size);
 104 #endif
 105 }
 106
 107 PB_DS_CLASS_T_DEC
 108 template<typename Pred>
 109 typename PB_DS_CLASS_C_DEC::node_pointer
 110 PB_DS_CLASS_C_DEC::
 111 prune(Pred pred)
 112 {
 113   node_pointer p_cur = m_p_root;
 114   m_p_root = 0;
 115   node_pointer p_out = 0;
 116   while (p_cur != 0)
 117     {
 118       node_pointer p_next = p_cur->m_p_next_sibling;
 119       if (pred(p_cur->m_value))
 120         {
 121           p_cur->m_p_next_sibling = p_out;
 122           if (p_out != 0)
 123             p_out->m_p_prev_or_parent = p_cur;
 124           p_out = p_cur;
 125         }
 126       else
 127         {
 128           p_cur->m_p_next_sibling = m_p_root;
 129           if (m_p_root != 0)
 130             m_p_root->m_p_prev_or_parent = p_cur;
 131           m_p_root = p_cur;
 132         }
 133       p_cur = p_next;
 134     }
 135   return p_out;
 136 }
 137
 138 PB_DS_CLASS_T_DEC
 139 void
 140 PB_DS_CLASS_C_DEC::
 141 bubble_to_top(node_pointer p_nd)
 142 {
 143   node_pointer p_parent = parent(p_nd);
 144   while (p_parent != 0)
 145     {
 146       swap_with_parent(p_nd, p_parent);
 147       p_parent = parent(p_nd);
 148     }
 149 }
 150