1 // -*- C++ -*-
2
3 // Copyright (C) 2005-2021 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 splay_tree_/erase_fn_imps.hpp
38 * Contains an implementation class for splay_tree_.
39 */
40
41 #ifdef PB_DS_CLASS_C_DEC
42
43 PB_DS_CLASS_T_DEC
44 inline bool
45 PB_DS_CLASS_C_DEC::
erase(key_const_reference r_key)46 erase(key_const_reference r_key)
47 {
48 point_iterator it = find(r_key);
49 if (it == base_type::end())
50 return false;
51 erase(it);
52 return true;
53 }
54
55 PB_DS_CLASS_T_DEC
56 inline typename PB_DS_CLASS_C_DEC::iterator
57 PB_DS_CLASS_C_DEC::
erase(iterator it)58 erase(iterator it)
59 {
60 PB_DS_ASSERT_VALID((*this))
61 if (it == base_type::end())
62 return it;
63 iterator ret_it = it;
64 ++ret_it;
65 erase_node(it.m_p_nd);
66 PB_DS_ASSERT_VALID((*this))
67 return ret_it;
68 }
69
70 PB_DS_CLASS_T_DEC
71 inline typename PB_DS_CLASS_C_DEC::reverse_iterator
72 PB_DS_CLASS_C_DEC::
erase(reverse_iterator it)73 erase(reverse_iterator it)
74 {
75 PB_DS_ASSERT_VALID((*this))
76 if (it.m_p_nd == base_type::m_p_head)
77 return (it);
78 reverse_iterator ret_it = it;
79 ++ret_it;
80 erase_node(it.m_p_nd);
81 PB_DS_ASSERT_VALID((*this))
82 return ret_it;
83 }
84
85 PB_DS_CLASS_T_DEC
86 template<typename Pred>
87 inline typename PB_DS_CLASS_C_DEC::size_type
88 PB_DS_CLASS_C_DEC::
erase_if(Pred pred)89 erase_if(Pred pred)
90 {
91 PB_DS_ASSERT_VALID((*this))
92 size_type num_ersd = 0;
93 iterator it = base_type::begin();
94 while (it != base_type::end())
95 {
96 if (pred(*it))
97 {
98 ++num_ersd;
99 it = erase(it);
100 }
101 else
102 ++it;
103 }
104 PB_DS_ASSERT_VALID((*this))
105 return num_ersd;
106 }
107
108 PB_DS_CLASS_T_DEC
109 void
110 PB_DS_CLASS_C_DEC::
erase_node(node_pointer p_nd)111 erase_node(node_pointer p_nd)
112 {
113 _GLIBCXX_DEBUG_ASSERT(p_nd != 0);
114 splay(p_nd);
115
116 PB_DS_ASSERT_VALID((*this))
117 _GLIBCXX_DEBUG_ASSERT(p_nd == this->m_p_head->m_p_parent);
118
119 node_pointer p_l = p_nd->m_p_left;
120 node_pointer p_r = p_nd->m_p_right;
121
122 base_type::update_min_max_for_erased_node(p_nd);
123 base_type::actual_erase_node(p_nd);
124 if (p_r == 0)
125 {
126 base_type::m_p_head->m_p_parent = p_l;
127 if (p_l != 0)
128 p_l->m_p_parent = base_type::m_p_head;
129 PB_DS_ASSERT_VALID((*this))
130 return;
131 }
132
133 node_pointer p_target_r = leftmost(p_r);
134 _GLIBCXX_DEBUG_ASSERT(p_target_r != 0);
135 p_r->m_p_parent = base_type::m_p_head;
136 base_type::m_p_head->m_p_parent = p_r;
137 splay(p_target_r);
138
139 _GLIBCXX_DEBUG_ONLY(p_target_r->m_p_left = 0);
140 _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_parent == this->m_p_head);
141 _GLIBCXX_DEBUG_ASSERT(this->m_p_head->m_p_parent == p_target_r);
142
143 p_target_r->m_p_left = p_l;
144 if (p_l != 0)
145 p_l->m_p_parent = p_target_r;
146 PB_DS_ASSERT_VALID((*this))
147 this->apply_update(p_target_r, (node_update*)this);
148 }
149
150 PB_DS_CLASS_T_DEC
151 inline typename PB_DS_CLASS_C_DEC::node_pointer
152 PB_DS_CLASS_C_DEC::
leftmost(node_pointer p_nd)153 leftmost(node_pointer p_nd)
154 {
155 _GLIBCXX_DEBUG_ASSERT(p_nd != 0);
156 while (p_nd->m_p_left != 0)
157 p_nd = p_nd->m_p_left;
158 return p_nd;
159 }
160 #endif
161