libstdc++
binomial_heap_base_/insert_fn_imps.hpp
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1 // -*- C++ -*-
2 
3 // Copyright (C) 2005-2017 Free Software Foundation, Inc.
4 //
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16 // Under Section 7 of GPL version 3, you are granted additional
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18 // 3.1, as published by the Free Software Foundation.
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25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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35 
36 /**
37  * @file binomial_heap_base_/insert_fn_imps.hpp
38  * Contains an implementation class for a base of binomial heaps.
39  */
40 
41 PB_DS_CLASS_T_DEC
42 inline typename PB_DS_CLASS_C_DEC::point_iterator
43 PB_DS_CLASS_C_DEC::
44 push(const_reference r_val)
45 {
46  PB_DS_ASSERT_VALID_COND((*this),true)
47  node_pointer p_nd = base_type::get_new_node_for_insert(r_val);
48  insert_node(p_nd);
49  m_p_max = 0;
50  PB_DS_ASSERT_VALID_COND((*this),true)
51  return point_iterator(p_nd);
52 }
53 
54 PB_DS_CLASS_T_DEC
55 inline void
56 PB_DS_CLASS_C_DEC::
57 insert_node(node_pointer p_nd)
58 {
59  if (base_type::m_p_root == 0)
60  {
61  p_nd->m_p_next_sibling = 0;
62  p_nd->m_p_prev_or_parent = 0;
63  p_nd->m_p_l_child = 0;
64  p_nd->m_metadata = 0;
65  base_type::m_p_root = p_nd;
66  return;
67  }
68 
69  if (base_type::m_p_root->m_metadata > 0)
70  {
71  p_nd->m_p_prev_or_parent = p_nd->m_p_l_child = 0;
72  p_nd->m_p_next_sibling = base_type::m_p_root;
73  base_type::m_p_root->m_p_prev_or_parent = p_nd;
74  base_type::m_p_root = p_nd;
75  p_nd->m_metadata = 0;
76  return;
77  }
78 
79  if (Cmp_Fn::operator()(base_type::m_p_root->m_value, p_nd->m_value))
80  {
81  p_nd->m_p_next_sibling = base_type::m_p_root->m_p_next_sibling;
82  p_nd->m_p_prev_or_parent = 0;
83  p_nd->m_metadata = 1;
84  p_nd->m_p_l_child = base_type::m_p_root;
85  base_type::m_p_root->m_p_prev_or_parent = p_nd;
86  base_type::m_p_root->m_p_next_sibling = 0;
87  base_type::m_p_root = p_nd;
88  }
89  else
90  {
91  p_nd->m_p_next_sibling = 0;
92  p_nd->m_p_l_child = 0;
93  p_nd->m_p_prev_or_parent = base_type::m_p_root;
94  p_nd->m_metadata = 0;
95  _GLIBCXX_DEBUG_ASSERT(base_type::m_p_root->m_p_l_child == 0);
96  base_type::m_p_root->m_p_l_child = p_nd;
97  base_type::m_p_root->m_metadata = 1;
98  }
99 
100  base_type::m_p_root = fix(base_type::m_p_root);
101 }
102 
103 PB_DS_CLASS_T_DEC
104 inline typename PB_DS_CLASS_C_DEC::node_pointer
105 PB_DS_CLASS_C_DEC::
106 fix(node_pointer p_nd) const
107 {
108  while (p_nd->m_p_next_sibling != 0 &&
109  p_nd->m_metadata == p_nd->m_p_next_sibling->m_metadata)
110  {
111  node_pointer p_next = p_nd->m_p_next_sibling;
112  if (Cmp_Fn::operator()(p_nd->m_value, p_next->m_value))
113  {
114  p_next->m_p_prev_or_parent = p_nd->m_p_prev_or_parent;
115 
116  if (p_nd->m_p_prev_or_parent != 0)
117  p_nd->m_p_prev_or_parent->m_p_next_sibling = p_next;
118 
119  base_type::make_child_of(p_nd, p_next);
120  ++p_next->m_metadata;
121  p_nd = p_next;
122  }
123  else
124  {
125  p_nd->m_p_next_sibling = p_next->m_p_next_sibling;
126 
127  if (p_nd->m_p_next_sibling != 0)
128  p_next->m_p_next_sibling = 0;
129 
130  base_type::make_child_of(p_next, p_nd);
131  ++p_nd->m_metadata;
132  }
133  }
134 
135  if (p_nd->m_p_next_sibling != 0)
136  p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd;
137 
138  return p_nd;
139 }
140 
141 PB_DS_CLASS_T_DEC
142 void
143 PB_DS_CLASS_C_DEC::
144 modify(point_iterator it, const_reference r_new_val)
145 {
146  PB_DS_ASSERT_VALID_COND((*this),true)
147  node_pointer p_nd = it.m_p_nd;
148 
149  _GLIBCXX_DEBUG_ASSERT(p_nd != 0);
150  PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd, false)
151 
152  const bool bubble_up = Cmp_Fn::operator()(p_nd->m_value, r_new_val);
153  p_nd->m_value = r_new_val;
154 
155  if (bubble_up)
156  {
157  node_pointer p_parent = base_type::parent(p_nd);
158  while (p_parent != 0 &&
159  Cmp_Fn::operator()(p_parent->m_value, p_nd->m_value))
160  {
161  base_type::swap_with_parent(p_nd, p_parent);
162  p_parent = base_type::parent(p_nd);
163  }
164 
165  if (p_nd->m_p_prev_or_parent == 0)
166  base_type::m_p_root = p_nd;
167 
168  m_p_max = 0;
169  PB_DS_ASSERT_VALID_COND((*this),true)
170  return;
171  }
172 
173  base_type::bubble_to_top(p_nd);
174  remove_parentless_node(p_nd);
175  insert_node(p_nd);
176  m_p_max = 0;
177  PB_DS_ASSERT_VALID_COND((*this),true)
178 }