1// -*- C++ -*-
2
3// Copyright (C) 2005-2013 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
41PB_DS_CLASS_T_DEC
42inline bool
43PB_DS_CLASS_C_DEC::
44erase(key_const_reference r_key)
45{
46  point_iterator it = find(r_key);
47  if (it == base_type::end())
48    return false;
49  erase(it);
50  return true;
51}
52
53PB_DS_CLASS_T_DEC
54inline typename PB_DS_CLASS_C_DEC::iterator
55PB_DS_CLASS_C_DEC::
56erase(iterator it)
57{
58  PB_DS_ASSERT_VALID((*this))
59  if (it == base_type::end())
60    return it;
61  iterator ret_it = it;
62  ++ret_it;
63  erase_node(it.m_p_nd);
64  PB_DS_ASSERT_VALID((*this))
65  return ret_it;
66}
67
68PB_DS_CLASS_T_DEC
69inline typename PB_DS_CLASS_C_DEC::reverse_iterator
70PB_DS_CLASS_C_DEC::
71erase(reverse_iterator it)
72{
73  PB_DS_ASSERT_VALID((*this))
74  if (it.m_p_nd == base_type::m_p_head)
75    return (it);
76  reverse_iterator ret_it = it;
77  ++ret_it;
78  erase_node(it.m_p_nd);
79  PB_DS_ASSERT_VALID((*this))
80  return ret_it;
81}
82
83PB_DS_CLASS_T_DEC
84template<typename Pred>
85inline typename PB_DS_CLASS_C_DEC::size_type
86PB_DS_CLASS_C_DEC::
87erase_if(Pred pred)
88{
89  PB_DS_ASSERT_VALID((*this))
90  size_type num_ersd = 0;
91  iterator it = base_type::begin();
92  while (it != base_type::end())
93    {
94      if (pred(*it))
95        {
96	  ++num_ersd;
97	  it = erase(it);
98        }
99      else
100	++it;
101    }
102  PB_DS_ASSERT_VALID((*this))
103  return num_ersd;
104}
105
106PB_DS_CLASS_T_DEC
107void
108PB_DS_CLASS_C_DEC::
109erase_node(node_pointer p_nd)
110{
111  _GLIBCXX_DEBUG_ASSERT(p_nd != 0);
112  splay(p_nd);
113
114  PB_DS_ASSERT_VALID((*this))
115  _GLIBCXX_DEBUG_ASSERT(p_nd == this->m_p_head->m_p_parent);
116
117  node_pointer p_l = p_nd->m_p_left;
118  node_pointer p_r = p_nd->m_p_right;
119
120  base_type::update_min_max_for_erased_node(p_nd);
121  base_type::actual_erase_node(p_nd);
122  if (p_r == 0)
123    {
124      base_type::m_p_head->m_p_parent = p_l;
125      if (p_l != 0)
126	p_l->m_p_parent = base_type::m_p_head;
127      PB_DS_ASSERT_VALID((*this))
128      return;
129    }
130
131  node_pointer p_target_r = leftmost(p_r);
132  _GLIBCXX_DEBUG_ASSERT(p_target_r != 0);
133  p_r->m_p_parent = base_type::m_p_head;
134  base_type::m_p_head->m_p_parent = p_r;
135  splay(p_target_r);
136
137  _GLIBCXX_DEBUG_ONLY(p_target_r->m_p_left = 0);
138  _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_parent == this->m_p_head);
139  _GLIBCXX_DEBUG_ASSERT(this->m_p_head->m_p_parent == p_target_r);
140
141  p_target_r->m_p_left = p_l;
142  if (p_l != 0)
143    p_l->m_p_parent = p_target_r;
144  PB_DS_ASSERT_VALID((*this))
145  this->apply_update(p_target_r, (node_update*)this);
146}
147
148PB_DS_CLASS_T_DEC
149inline typename PB_DS_CLASS_C_DEC::node_pointer
150PB_DS_CLASS_C_DEC::
151leftmost(node_pointer p_nd)
152{
153  _GLIBCXX_DEBUG_ASSERT(p_nd != 0);
154  while (p_nd->m_p_left != 0)
155    p_nd = p_nd->m_p_left;
156  return p_nd;
157}
158