libstdc++
bin_search_tree_/split_join_fn_imps.hpp
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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 bin_search_tree_/split_join_fn_imps.hpp
38 * Contains an implementation class for bin_search_tree_.
39 */
40
41PB_DS_CLASS_T_DEC
42bool
43PB_DS_CLASS_C_DEC::
44join_prep(PB_DS_CLASS_C_DEC& other)
45{
46 PB_DS_ASSERT_VALID((*this))
47 PB_DS_ASSERT_VALID(other)
48 if (other.m_size == 0)
49 return false;
50
51 if (m_size == 0)
52 {
53 value_swap(other);
54 return false;
55 }
56
57 const bool greater =
58 Cmp_Fn::operator()(PB_DS_V2F(m_p_head->m_p_right->m_value),
59 PB_DS_V2F(other.m_p_head->m_p_left->m_value));
60
61 const bool lesser =
62 Cmp_Fn::operator()(PB_DS_V2F(other.m_p_head->m_p_right->m_value),
63 PB_DS_V2F(m_p_head->m_p_left->m_value));
64
65 if (!greater && !lesser)
66 __throw_join_error();
67
68 if (lesser)
69 value_swap(other);
70
71 m_size += other.m_size;
72 _GLIBCXX_DEBUG_ONLY(debug_base::join(other);)
73 return true;
74}
75
76PB_DS_CLASS_T_DEC
77void
78PB_DS_CLASS_C_DEC::
79join_finish(PB_DS_CLASS_C_DEC& other)
80{
81 initialize_min_max();
82 other.initialize();
83}
84
85PB_DS_CLASS_T_DEC
86bool
87PB_DS_CLASS_C_DEC::
88split_prep(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
89{
90 PB_DS_ASSERT_VALID((*this))
91 PB_DS_ASSERT_VALID(other)
92 other.clear();
93
94 if (m_size == 0)
95 {
96 PB_DS_ASSERT_VALID((*this))
97 PB_DS_ASSERT_VALID(other)
98 return false;
99 }
100
101 if (Cmp_Fn::operator()(r_key, PB_DS_V2F(m_p_head->m_p_left->m_value)))
102 {
103 value_swap(other);
104 PB_DS_ASSERT_VALID((*this))
105 PB_DS_ASSERT_VALID(other)
106 return false;
107 }
108
109 if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(m_p_head->m_p_right->m_value)))
110 {
111 PB_DS_ASSERT_VALID((*this))
112 PB_DS_ASSERT_VALID(other)
113 return false;
114 }
115
116 if (m_size == 1)
117 {
118 value_swap(other);
119 PB_DS_ASSERT_VALID((*this))
120 PB_DS_ASSERT_VALID(other)
121 return false;
122 }
123
124 _GLIBCXX_DEBUG_ONLY(debug_base::split(r_key,(Cmp_Fn& )(*this), other);)
125 return true;
126}
127
128PB_DS_CLASS_T_DEC
129void
130PB_DS_CLASS_C_DEC::
131split_finish(PB_DS_CLASS_C_DEC& other)
132{
133 other.initialize_min_max();
134 other.m_size = std::distance(other.begin(), other.end());
135 m_size -= other.m_size;
136 initialize_min_max();
137 PB_DS_ASSERT_VALID((*this))
138 PB_DS_ASSERT_VALID(other)
139}
140
141PB_DS_CLASS_T_DEC
142typename PB_DS_CLASS_C_DEC::size_type
143PB_DS_CLASS_C_DEC::
144recursive_count(node_pointer p) const
145{
146 if (p == 0)
147 return 0;
148 return 1 + recursive_count(p->m_p_left) + recursive_count(p->m_p_right);
149}
150
_GLIBCXX17_CONSTEXPR iterator_traits< _InputIterator >::difference_type distance(_InputIterator __first, _InputIterator __last)
A generalization of pointer arithmetic.