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[pf3gnuchains/gcc-fork.git] / libstdc++-v3 / include / ext / pb_ds / detail / bin_search_tree_ / split_join_fn_imps.hpp
1 // -*- C++ -*-
2
3 // Copyright (C) 2005, 2006, 2009, 2010 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 split_join_fn_imps.hpp
38  * Contains an implementation class for bin_search_tree_.
39  */
40
41 PB_DS_CLASS_T_DEC
42 bool
43 PB_DS_CLASS_C_DEC::
44 join_prep(PB_DS_CLASS_C_DEC& other)
45 {
46   _GLIBCXX_DEBUG_ONLY(assert_valid();)
47   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
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 = Cmp_Fn::operator()(PB_DS_V2F(m_p_head->m_p_right->m_value), PB_DS_V2F(other.m_p_head->m_p_left->m_value));
58
59   const bool lesser = Cmp_Fn::operator()(PB_DS_V2F(other.m_p_head->m_p_right->m_value), PB_DS_V2F(m_p_head->m_p_left->m_value));
60
61   if (!greater && !lesser)
62     __throw_join_error();
63
64   if (lesser)
65     value_swap(other);
66
67   m_size += other.m_size;
68   _GLIBCXX_DEBUG_ONLY(debug_base::join(other);)
69   return true;
70 }
71
72 PB_DS_CLASS_T_DEC
73 void
74 PB_DS_CLASS_C_DEC::
75 join_finish(PB_DS_CLASS_C_DEC& other)
76 {
77   initialize_min_max();
78   other.initialize();
79 }
80
81 PB_DS_CLASS_T_DEC
82 bool
83 PB_DS_CLASS_C_DEC::
84 split_prep(const_key_reference r_key, PB_DS_CLASS_C_DEC& other)
85 {
86   _GLIBCXX_DEBUG_ONLY(assert_valid();)
87   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
88   other.clear();
89
90   if (m_size == 0)
91     {
92       _GLIBCXX_DEBUG_ONLY(assert_valid();)
93       _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
94       return false;
95     }
96
97   if (Cmp_Fn::operator()(r_key, PB_DS_V2F(m_p_head->m_p_left->m_value)))
98     {
99       value_swap(other);
100       _GLIBCXX_DEBUG_ONLY(assert_valid();)
101       _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
102       return false;
103     }
104
105   if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(m_p_head->m_p_right->m_value)))
106     {
107       _GLIBCXX_DEBUG_ONLY(assert_valid();)
108       _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
109       return false;
110     }
111
112   if (m_size == 1)
113     {
114       value_swap(other);
115       _GLIBCXX_DEBUG_ONLY(assert_valid();)
116       _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
117       return false;
118     }
119
120   _GLIBCXX_DEBUG_ONLY(debug_base::split(r_key,(Cmp_Fn& )(*this), other);)
121   return true;
122 }
123
124 PB_DS_CLASS_T_DEC
125 void
126 PB_DS_CLASS_C_DEC::
127 split_finish(PB_DS_CLASS_C_DEC& other)
128 {
129   other.initialize_min_max();
130   other.m_size = std::distance(other.begin(), other.end());
131   m_size -= other.m_size;
132   initialize_min_max();
133   _GLIBCXX_DEBUG_ONLY(assert_valid();)
134   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
135 }
136
137 PB_DS_CLASS_T_DEC
138 typename PB_DS_CLASS_C_DEC::size_type
139 PB_DS_CLASS_C_DEC::
140 recursive_count(node_pointer p) const
141 {
142   if (p == 0)
143     return 0;
144   return 1 + recursive_count(p->m_p_left) + recursive_count(p->m_p_right);
145 }
146